Last updated: 7 October 2026 · Applies to the Android app and to this website.

The Synapse Brain Games app does not collect personal data. It has no ads, no analytics, no account and no third-party tracking, and your progress stays on your device. It goes online for one thing only: the optional one-time unlock, which Google Play processes.

Who this policy is from

This policy is published by Oleksii Khvatov, the developer of the Synapse Brain Games Android app and the operator of freebraingames.net.

Part 1 — The Android app

Personal data collected: none

The app does not ask for, collect, transmit or store any personal or sensitive information. Specifically it does not collect:

Your name, email address, phone number or account credentials — there is no sign-up and there are no user accounts
Your location, contacts, photos, files, camera or microphone data
Device identifiers, advertising IDs or analytics identifiers
Crash reports or usage analytics of any kind

The app requests no Android permissions at all, including no INTERNET permission. It is technically incapable of sending data anywhere. There are no ads and no in-app purchases.

What the app saves on your device

So your training carries over between sessions, the app stores the following locally. It stays on your device and is readable only by the app.

Stored	Purpose
Difficulty level reached in each game	So you resume at the right level instead of restarting
Skill experience points and skill levels	To show Memory, Attention, Math, Logic and Speed progress
Session count, current and longest streak	To display training consistency
Best score per game and mastery badges	To show personal records and achievements
Date last played	To calculate the daily streak and daily workout
Theme and sound preferences	To remember your settings
A local diagnostic log of app events and errors	To help diagnose crashes. On-device only, size-capped, never transmitted

None of this identifies you personally.

Google Play backup

Android offers an optional system feature that backs up app data to your own Google Account. If you have it enabled, your saved progress may be included so it can be restored when you reinstall the app or set up a new phone. That backup is performed by Android and Google, not by us — we have no access to it and cannot read it. It is governed by Google’s Privacy Policy. You can switch it off under Settings → Google → Backup on your device.

Backup files you create yourself

The Profile screen has a “Save backup” button that writes your progress to a file on your device. It is created only when you tap it, saved where your device keeps downloads, and stays entirely under your control. We never receive it. If you share that file, whoever receives it can read the progress data inside.

Deleting your app data

Export it: Profile → Save backup
Delete all of it: Settings → Apps → Synapse → Storage → Clear data
Remove everything: uninstalling the app deletes all locally stored data

Note: “Clear cache” does not delete progress. Only “Clear data” and uninstalling do.

Part 2 — This website

Playing the games in your browser

The games embedded on this site run entirely in your browser. Your progress is saved in your browser’s local storage on your own computer or phone. It is not sent to us, and clearing your browser data removes it.

If you contact us

The contact form on this site is provided by WPForms. When you submit it, the name, email address and message you enter are emailed to us, and depending on the plugin configuration a copy may also be saved as an entry in this website’s database. WPForms can additionally record the IP address and browser user agent of the submission for spam prevention.

We use this information solely to read and answer your message. We never use it for marketing, and we never sell or share it with anyone. Email us and we will delete your message and any stored entry.

Server logs and hosting

Like practically every website, our hosting provider automatically records technical request logs, which can include your IP address, browser type and the pages requested. These are generated by the hosting infrastructure for security and troubleshooting, are kept for a short period, and are not used to build any profile of you.

Cookies and analytics

This site runs no advertising and no third-party analytics or tracking scripts. WordPress may set a functional cookie if you leave a comment or log in, and your browser stores your game progress locally — neither is used to track you across other sites.

External links

Some pages link to third-party sites, such as a “Buy me a coffee” donation page or the Google Play listing. Once you follow such a link you are on that company’s site and its own privacy policy applies. We receive no payment details — donations are handled entirely by the payment provider.

Children

The games are suitable for all ages. We do not knowingly collect personal information from anyone, including children. Because the app collects nothing and transmits nothing, there is nothing to disclose, sell or share. There are no ads and no in-app purchases.

Your rights

We operate from Ukraine, and handle personal data in line with its data protection law — for Ukraine, the Law of Ukraine “On Protection of Personal Data”.

The app is available worldwide, so if you are in the European Economic Area or the United Kingdom you also have rights under the GDPR. In either case you may ask us to access, correct, delete or provide a copy of any personal data we hold about you, and object to our processing of it. In practice the app holds nothing at all, so a request will normally concern a message you sent us through the contact form or by email.

Write to the address below and we will respond. If you believe we have mishandled your data, you may also complain to your national data protection authority.

Data retention

App data stays on your device until you clear it or uninstall it. Messages you send us — whether by email or through the contact form — are kept only as long as needed to deal with your question, and are deleted on request. Hosting logs are retained for a short period by the hosting provider.

Changes to this policy

If behaviour ever changes in a way that affects privacy — for example if a future version added online features — this page will be updated and the date at the top will change. Material changes will also be noted in the app’s release notes on Google Play.

Contact

For any question about privacy, or to make a request about your data, contact:
askaleks@gmail.com
Oleksii Khvatov

Affirmo Privacy Policy

Last updated: 15 October 2026 · Applies to the Affirmo app for Android.

Affirmo does not collect personal data. It has no ads, no analytics, no account and no third-party tracking, and your affirmations and settings stay on your device. It has no internet access at all, so it cannot send anything anywhere.

Who this policy is from

This policy is published by Oleksii Khvatov, the developer of the Affirmo Android app, listed on Google Play as “Affirmo: Positive Affirmations”.

Personal data collected: none

The app does not ask for any personal information, and nothing you write or set in it leaves your phone through the app. Specifically, it does not collect:

Your name, email address, phone number or account credentials — there is no sign-up and there are no user accounts
Your location, contacts, photos, files, camera or microphone data
Device identifiers, advertising IDs or analytics identifiers
Crash reports or usage analytics of any kind

The app has no INTERNET permission, so it is technically incapable of sending data anywhere. There are no ads and no in-app purchases.

Permissions the app uses

Affirmo asks Android for the permissions below. Each one is used only on your phone, for the feature named, and none is used to collect data.

Notifications (POST_NOTIFICATIONS) — to show affirmations as notifications. Android asks you to allow this, and you can turn it off at any time.
Alarms & reminders (SCHEDULE_EXACT_ALARM) — to show reminders at the exact times you set.
Run at startup (RECEIVE_BOOT_COMPLETED) — to set your reminders again after the phone restarts, and to show the optional affirmation when the phone starts.
Vibration (VIBRATE) — for prominent notifications and for light feedback when you tap.
Foreground service (FOREGROUND_SERVICE, FOREGROUND_SERVICE_SPECIAL_USE) — only while the optional “Affirmation on unlock” reminder is switched on. It lets Affirmo notice when you unlock your phone so it can show an affirmation, and an ongoing notification, “Affirmo is watching for unlocks”, is shown the whole time. Affirmo keeps no record of your unlocks: it only notes the time of the last unlock affirmation, so the next one waits for the interval you chose.

What the app saves on your device

So your affirmations and settings carry over between sessions, the app stores the following locally. It stays on your device, in storage that only Affirmo can read.

Stored	Purpose
Affirmations you write yourself, and the pack you file each one under	So they appear in your deck, reminders and widgets
Your favourites	To keep the affirmations you saved with the heart
Which packs are switched on, and where affirmations come from (all packs, favourites or only your own)	To show only what you chose
Recently shown affirmations and the order of the deck	So affirmations do not repeat too soon
Reminder settings: on or off, style, sound, buttons, category, interval, random moments, set times, quiet hours, days, and the unlock and restart options	To remind you the way you set it up
Look and feel: theme, accent colour, font, text size and style, card style, animation, counter and haptics	To remember your settings
The settings of each home screen widget	To draw each widget the way you set it up
Times of the last and next reminder and of the last unlock affirmation, plus small technical markers such as notification numbers	To schedule reminders and to space out unlock affirmations

None of this identifies you personally.

Notifications and widgets

Reminders show an affirmation’s text in a notification, and widgets show it on your home screen. Affirmo’s notifications are set to show their text on the lock screen too, so anyone who can see your phone can read it, including affirmations you wrote yourself. If you prefer to keep them private, turn off lock screen notifications in your phone’s notification settings.

Google Play backup

Android offers an optional system feature that backs up app data to your own Google Account. If you have it enabled, your affirmations, favourites and settings may be included, so they can be restored when you reinstall the app or set up a new phone. That backup is performed by Android and Google, not by us — we have no access to it and cannot read it. It is governed by Google’s Privacy Policy. You can switch it off under Settings → Google → Backup on your device (the exact path varies by phone).

Backup files you create yourself

Library → Backup and restore (also in the side menu) has an “Export to file” button. It saves your own affirmations, your favourites, which packs are switched on and the time of the export to a small file (affirmo-backup.json). The file is created only when you tap the button, is saved where you choose in Android’s file picker, and stays entirely under your control. We never receive it. It is not encrypted, so if you share that file, whoever receives it can read the affirmations inside.

“Import from file” reads only the file you pick and adds its contents to what is already in the app; nothing is deleted.

Sharing an affirmation

When you tap Share on an affirmation, Android’s share sheet passes that affirmation’s text to the app you choose, such as a messaging app. Affirmo sends it nowhere else. What happens to it next is governed by the app you picked.

Google Play

You install Affirmo from Google Play, which Google runs under its own privacy policy. Google shows app developers aggregated statistics, such as the number of installs, and anonymous reports about crashes and app performance from people who allowed their phone to share usage and diagnostics data with Google. These reports do not include your affirmations or settings, and they do not tell us who you are. The app itself sends nothing to Google or to us.

How your data is protected

Everything Affirmo stores is kept in the app’s private storage, which Android keeps separate from other apps, and nothing is sent over the internet, so there is no server where your data could be exposed. The only copies outside that storage are the ones you make yourself: backup files you export, and your phone’s own Google backup if it is turned on.

Deleting your app data

Export it first, if you want to keep it: Library → Backup and restore → Export to file
Delete single items: in Library, the delete icon next to an affirmation you wrote deletes it, and tapping a filled heart removes a favourite
Delete all of it: Settings → Apps → Affirmo → Storage → Clear storage (called Clear data on some phones)
Remove everything: uninstalling the app deletes all locally stored data

Note: “Clear cache” does not delete your affirmations or settings. Only clearing storage and uninstalling do. A copy in your phone’s Google backup, if you use it, is managed in your Google Account.

Children

Affirmo is made for a general audience and is not directed at children under 13. We do not knowingly collect personal information from anyone, including children. Because the app collects nothing and transmits nothing, there is nothing to disclose, sell or share. There are no ads and no in-app purchases.

Your rights

We operate from Ukraine, and handle personal data in line with the Law of Ukraine “On Protection of Personal Data”.

The app is available worldwide, so if you are in the European Economic Area or the United Kingdom you also have rights under the GDPR. In either case you may ask us to access, correct, delete or provide a copy of any personal data we hold about you, and object to our processing of it. In practice the app gives us nothing at all, so a request will normally concern an email you sent us.

Write to the address below and we will respond. If you believe we have mishandled your data, you may also complain to your national data protection authority.

Data retention

App data stays on your device until you delete it, clear the app’s storage or uninstall Affirmo. Backup files you export stay wherever you saved them until you delete them. Emails you send us are kept only as long as needed to deal with your question, and are deleted on request.

Changes to this policy

Contact

For any question about privacy, or to make a request about your data, contact:

askaleks@gmail.com
Oleksii Khvatov

DNS Changer Privacy Policy

Last updated: 15 October 2026 · Applies to the DNS Changer app for Android.

DNS Changer does not collect personal data. It has no ads, no analytics, no account and no third-party tracking, and its settings stay on your device. It changes which DNS server your phone uses. Your DNS queries then go from your phone straight to the DNS provider you choose, never through the app and never to us.

Who this policy is from

This policy is published by Oleksii Khvatov, the developer of the DNS Changer Android app, listed on Google Play as “DNS Changer”.

Personal data collected: none

The app does not ask for any personal information, and we run no servers, so nothing you do in the app reaches us. Specifically, it does not collect:

Your name, email address, phone number or account credentials — there is no sign-up and there are no user accounts
The websites you visit, the DNS queries your phone makes or any other browsing activity
Your location, contacts, photos, files, camera or microphone data
Device identifiers, advertising IDs or analytics identifiers
Crash reports or usage analytics of any kind

There are no ads and no in-app purchases. Only three things go online because of the app, all described under “What goes online, and to whom”, and each goes directly to the service named there, never to us.

How DNS Changer uses Android’s VPN feature

Android doesn’t let apps change the DNS server without root, so DNS Changer uses Android’s VpnService to set up a local VPN on your phone. This VPN only tells Android which DNS server to use. It has no routes, so none of your traffic enters it: your connections, including the DNS queries themselves, go straight to the internet over your normal Wi-Fi or mobile network. The app never sees, records or changes your traffic or your DNS queries, and nothing passes through a server of ours, because there isn’t one.

Before DNS Changer starts for the first time, the app explains this on a screen with two buttons, “Agree and continue” and “Not now”. “Not now” starts nothing, and the screen appears again the next time. After you agree, Android asks for your permission with its own connection request. While DNS Changer is on, Android shows a key icon in the status bar, and you can turn it off at any time in the app, with Stop in its notification, or in Android’s VPN settings.

What goes online, and to whom

Only these three things go online because of the app, always directly from your phone to the service named:

Your DNS queries, while DNS Changer is on, go to the DNS provider you selected, such as Google DNS, Cloudflare DNS, Quad9 or AdGuard DNS, or to a custom server you added. It receives the names of the websites and services your apps connect to, and your IP address.
A public IP lookup, when you open Network Info, goes to api.ipify.org, or if it doesn’t answer, to icanhazip.com and then ifconfig.me, over an encrypted HTTPS connection. They receive your IP address and a request labelled “DNSChanger-Android”.
The DNS Speed Test, when you first open it and whenever you run it again, sends test queries for google.com, wikipedia.org and cloudflare.com to every DNS server in your list. Each server receives those queries and your IP address.

Your DNS provider. While DNS Changer is on, the provider you selected answers your DNS queries under its own privacy policy, which you can read on its website. Like your internet provider’s DNS server before, it can see which websites and services your apps look up, and from which IP address. Choose a provider you trust. Apps you set to bypass DNS Changer in App Filter, and DNS Changer itself, keep using your network’s usual DNS.

IP lookup and speed test. The app shows their results on screen and doesn’t keep them or send them anywhere else.

Permissions the app uses

DNS Changer asks Android for the permissions below. Each one is used only for the feature named, and none is used to collect data.

Internet (INTERNET) — for the IP lookup and the speed test described above. The DNS change itself is made by Android.
Network state (ACCESS_NETWORK_STATE) — to show your connection details in Network Info, and to warn you when Android’s Private DNS setting would override DNS Changer.
Wi-Fi state (ACCESS_WIFI_STATE) — to show Wi-Fi details, such as the band and link speed, in Network Info.
Notifications (POST_NOTIFICATIONS) — to show that DNS Changer is on, with the selected server and a Stop button. Android asks you to allow this, and you can turn it off at any time.
VPN — not an ordinary permission: Android asks with its own connection request the first time you start DNS Changer. The VPN is used only to set the DNS server, as described above.

To fill App Filter, the app also sees which apps on your phone have a launcher icon. This needs no permission prompt, and the list is read on your phone and never leaves it. Network Info likewise reads your connection details on the phone — the connection type, local and gateway IP addresses, the DNS servers in use and how fast the phone is moving data overall — and shows them without saving or sending them.

What the app saves on your device

So your choices carry over between sessions, the app stores the following locally. It stays on your device, in storage that only DNS Changer can read.

Stored	Purpose
The DNS server you selected	To use it each time DNS Changer starts
Custom DNS servers you add: the name you give each one and its IPv4 and IPv6 addresses	To show them in your server list
The apps you set to bypass DNS Changer in App Filter	So those apps keep using your network’s usual DNS
Whether DNS Changer should be on	To turn it back on if Android restarts it
Whether you agreed to the VPN notice, and whether the app has already asked to show notifications	So it doesn’t ask again

None of this identifies you personally. Speed test results, network details and your public IP address are only shown on screen, never saved.

Google Play backup

Android offers an optional system feature that backs up app data to your own Google Account. If you have it enabled, your selected server, custom servers and App Filter choices may be included, so they can be restored when you reinstall the app or set up a new phone. That backup is performed by Android and Google, not by us — we have no access to it and cannot read it. It is governed by Google’s Privacy Policy. You can switch it off under Settings → Google → Backup on your device (the exact path varies by phone).

Google Play

You install DNS Changer from Google Play, which Google runs under its own privacy policy. Google shows app developers aggregated statistics, such as the number of installs, and anonymous reports about crashes and app performance from people who allowed their phone to share usage and diagnostics data with Google. These reports do not include your DNS queries or settings, and they do not tell us who you are. The app itself sends nothing to us, and it contacts Google only as described above: when you choose Google DNS, and when the speed test checks Google’s servers.

How your data is protected

Everything DNS Changer stores is kept in the app’s private storage, which Android keeps separate from other apps. We have no server, so there is nothing about you on our side that could be exposed. The IP lookup uses an encrypted HTTPS connection. DNS Changer doesn’t add encryption to DNS queries: unless Android encrypts them itself, they travel as standard DNS, as they would without the app, so networks along the way, such as your Wi-Fi or mobile operator, may be able to see them. The only copy of your settings outside the app is your phone’s own Google backup, if it is turned on.

Deleting your app data

Delete single items: in DNS Servers, open a custom server and tap Delete; in App Filter, switch an app back to using DNS Changer
Delete all of it: Settings → Apps → DNS Changer → Storage → Clear storage (called Clear data on some phones)
Remove everything: uninstalling the app deletes all locally stored data

Note: “Clear cache” does not delete your settings. Only clearing storage and uninstalling do. A copy in your phone’s Google backup, if you use it, is managed in your Google Account. Records your DNS provider keeps are covered by its own policy; we can’t see or delete them.

Children

DNS Changer is made for a general audience and is not directed at children under 13. We do not knowingly collect personal information from anyone, including children. Because the app collects nothing and sends nothing to us, there is nothing to disclose, sell or share. There are no ads and no in-app purchases.

Your rights

We operate from Ukraine, and handle personal data in line with the Law of Ukraine “On Protection of Personal Data”.

The app is available worldwide, so if you are in the European Economic Area or the United Kingdom you also have rights under the GDPR. In either case you may ask us to access, correct, delete or provide a copy of any personal data we hold about you, and object to our processing of it. In practice the app gives us nothing at all, so a request will normally concern an email you sent us. For your DNS queries, contact the DNS provider you chose, which holds any records of them.

Write to the address below and we will respond. If you believe we have mishandled your data, you may also complain to your national data protection authority.

Data retention

App data stays on your device until you delete it, clear the app’s storage or uninstall DNS Changer. We keep no records of your DNS queries, IP lookups or speed tests, because none of them reach us. DNS providers and the IP lookup services keep their own records for as long as their own policies say. Emails you send us are kept only as long as needed to deal with your question, and are deleted on request.

Changes to this policy

If behaviour ever changes in a way that affects privacy — for example if a future version added new online features — this page will be updated and the date at the top will change. Material changes will also be noted in the app’s release notes on Google Play. The app shows a short version of this policy under Menu → Privacy Policy.

Contact

For any question about privacy, or to make a request about your data, contact:

askaleks@gmail.com
Oleksii Khvatov

Octo PDF Reader Privacy Policy

Last updated: 28 October 2026 · Applies to the Octo PDF Reader app for Android.

Octo PDF Reader does not collect personal data. It has no ads, no analytics, no account and no tracking, and your documents, signatures and settings stay on your device. Opening, reading, converting, merging, splitting, compressing, annotating, signing and password-protecting documents all happen on your phone, and the app never uploads your files. The one exception is the optional Scan to PDF tool: its scanner comes from Google Play services, and Google collects diagnostic information about it, as described below.

Who this policy is from

This policy is published by Oleksii Khvatov, the developer of the Octo PDF Reader Android app, listed on Google Play as “Octo PDF Reader: Docs Viewer”.

Personal data collected: none

The app does not ask for any personal information, and nothing you open, write or sign in it leaves your phone through the app. We run no servers, so none of it reaches us. Specifically, the app does not collect:

Your name, email address, phone number or account credentials — there is no sign-up and there are no user accounts
Your documents, their contents or their names
Your signatures or the passwords you type
Your location, contacts, camera or microphone data
Advertising IDs or analytics identifiers
Crash reports or usage analytics of its own

There are no ads and no in-app purchases. The only data that leaves your phone because of the app is the diagnostic information Google’s document scanner collects when you use Scan to PDF, described under “Scan to PDF (Google ML Kit)”. It goes to Google, never to us.

Your documents stay on your phone

Octo PDF Reader works with your documents on your phone and never uploads, copies or sends them anywhere on its own.

Viewing. PDF, Word, Excel, PowerPoint and text files are opened and shown on your phone. Word, Excel and PowerPoint files are shown with all network access blocked, so pictures or other content that a document links to on the internet are not loaded. Links inside a document open in your web browser only when you tap them.
PDF tools. Scanning, making a PDF from images, saving PDF pages as images, merging, splitting, compressing, annotating, signing, protecting and unlocking all run on your phone. New files are saved in Documents/Octo PDF Reader, and page pictures in Pictures/Octo PDF Reader: ordinary folders that you, your file manager and your gallery can see. Signed, protected and unlocked PDFs are new copies, so the original document isn’t changed. When you save annotations, you choose whether to save them into the original file or as a copy.
Working copies. While you view a PDF, or annotate, sign or convert a document, the app may keep a temporary copy in its private storage, which other apps can’t read. The copy is deleted when you close the document or the tool, and any left behind if the app stops unexpectedly are cleaned up later.
The document list. The list of documents in the app comes from Android’s own index of the files on your phone, read when you open the app. Apart from your favourites and recent list (see below), the app keeps no copy of it.

Permissions the app uses

Octo PDF Reader asks Android for the permissions below. Each one is used only for the purpose given, and none is used to collect data.

All files access (MANAGE_EXTERNAL_STORAGE), on Android 11 and newer — so the app can find the documents on your phone and SD card, including ones other apps saved there, such as downloads, messenger files and email attachments. It uses this access to list and open them, and to rename or delete a file when you ask. You allow it on a system settings page and can turn it off there at any time. Without it, the app still opens files you send to it from other apps or pick in Android’s file picker.
Storage (READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE), on Android 9 and 10 — the same access on those versions, where Android asks you in a dialog. It also lets the app save new files in your Documents and Pictures folders.
Internet and network state (INTERNET, ACCESS_NETWORK_STATE) — not used by the app’s own code. Google’s ML Kit library, which runs the Scan to PDF scanner, adds them so it can send its diagnostic information to Google (see below). Documents are always shown with network access blocked.

The app also declares a technical permission that Android’s support library (AndroidX) adds, net.freebraingames.octoreader.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION, which stops other apps from receiving the app’s internal messages. It gives no access to anything.

Octo PDF Reader has no camera, microphone, location or contacts permission. To make a PDF from images, or a signature from a photo, it uses Android’s photo picker, which gives the app only the pictures you choose.

Scan to PDF (Google ML Kit)

Scan to PDF uses Google’s ML Kit document scanner, which is part of Google Play services. The scanner screen, including the camera, is run by Google Play services: Octo PDF Reader has no camera permission of its own and receives only the scanned pages you choose to keep, which it saves as a PDF in Documents/Octo PDF Reader. Google states that the whole scanning process runs on your phone.

When you use it, Google Play services may first download the scanner, and ML Kit collects diagnostic information about it:

device information, such as the manufacturer, model, Android version and build
app information: the package name and app version
identifiers: a device identifier, and per-installation identifiers that Google says are not intended to uniquely identify a user or physical device
performance metrics, such as how long the scanner takes
the scanner’s settings, such as image format and resolution, and the size of its input and output
event types and error codes

Google uses this information for diagnostics and usage analytics, encrypts it in transit and says it doesn’t transfer it to third parties (ML Kit data disclosure). It goes to Google, not to us, and Google’s Privacy Policy applies to it. The scanner starts only when you tap Scan to PDF, so if you don’t use it, none of this happens.

What the app saves on your device

To remember your library and settings between sessions, the app stores the following locally, in storage that only Octo PDF Reader can read:

Stored	Purpose
Favourites: the name, location and size of each document you starred, and when you starred it	To show them under Favorites
Recently opened documents: the name, location and size of each, and when you opened it	To show them under Recent
Signatures you save (drawn, typed or taken from a photo): the signature picture, its label and type, and when it was made and last used	So you can sign PDFs without making your signature again
Settings: theme, sort order, list or grid view, keep screen on, simple PDF view, and the text size of the text viewer	To remember your settings
Whether you answered the welcome card about file access, and two technical markers for the PDF viewer: whether it was on screen when the app last stopped, and how many times in a row it failed to load	So the welcome card isn’t shown again, and so PDFs open in the simple view if the full viewer keeps failing

All of it stays on your phone, and we never receive it. Passwords you type to open or protect PDFs are never saved: they are used only while that screen is open.

When something goes wrong, the app also writes a short technical message to Android’s system log on your phone, which can include a file’s name or location. It is there for troubleshooting with developer tools; the app doesn’t save it to a file and never sends it anywhere.

Google Play backup

Octo PDF Reader is set to stay out of Android’s app backup. Your favourites, recent list, settings and signatures are not backed up to your Google Account and are not copied to a new phone, so a new phone or a reinstall starts with a fresh app. Your documents, and the files the app creates, are ordinary files on your phone: whether they are backed up depends on your phone’s own backup settings, not on the app.

Sharing, printing and links

Share and Open with pass the file, or the files you selected, to the app you choose in Android’s share sheet. Octo PDF Reader sends them nowhere else; what happens to them next is governed by the app you picked.
Print hands the document to Android’s print system, which sends it to the printer or print service you choose, under that service’s own privacy policy.
Files from other apps. When another app opens a document in Octo PDF Reader, the app reads only that file.
Links you tap in a document open in your web browser, and the website you visit has its own privacy policy.

Google Play

You install Octo PDF Reader from Google Play, which Google runs under its own privacy policy. Google shows app developers aggregated statistics, such as the number of installs, and anonymous reports about crashes and app performance from people who allowed their phone to share usage and diagnostics data with Google. These reports contain technical details, such as the phone model and where in the app the problem happened. They don’t contain your documents, signatures or settings, and they don’t tell us who you are. Apart from the scanner diagnostics described above, the app itself sends nothing to Google or to us.

How your data is protected

Everything Octo PDF Reader stores is kept in the app’s private storage, which Android keeps separate from other apps. We have no server, so there is nothing about you on our side that could be exposed. Documents are shown with network access blocked, passwords are never saved, and working copies are deleted when you close a document. Protect PDF encrypts the copy it makes with 256-bit AES, the strongest standard PDF encryption, using the password you choose. The only copies of your data outside the app’s private storage are the ones you make yourself, such as the new files you save and the files you share, and the scanner diagnostics Google collects when you use Scan to PDF.

Deleting your app data

Delete single items: in a document’s menu, tap Remove from recent; tap a filled star to remove a favourite; delete a saved signature in the app’s Settings → My signatures
Clear the recent list: in the app’s Settings → Clear recent list (also on the Recent screen). Your files are not deleted
Delete all of it: in your phone’s Settings → Apps → Octo PDF Reader → Storage → Clear storage (called Clear data on some phones)
Remove everything: uninstalling the app deletes all of it

Note: Clear cache deletes only the temporary working copies. Files the app saved in Documents/Octo PDF Reader and Pictures/Octo PDF Reader are yours and stay on your phone after you uninstall the app; delete them in your file manager or gallery if you don’t need them. On Android 9, if you haven’t allowed storage access, new files go to the app’s own folder (Android/data/net.freebraingames.octoreader), which Android deletes when you uninstall the app. The diagnostic information Google collects for the scanner is covered by Google’s policies; we can’t see or delete it.

Children

Octo PDF Reader is made for a general audience and is not directed at children under 13. We do not knowingly collect personal information from anyone, including children. Because the app collects nothing for us and sends nothing to us, there is nothing to disclose, sell or share. There are no ads and no in-app purchases.

Your rights

We operate from Ukraine and handle personal data in line with the Law of Ukraine “On Protection of Personal Data”.

The app is available worldwide, so if you are in the European Economic Area or the United Kingdom you also have rights under the GDPR. In either case you may ask us to access, correct, delete or provide a copy of any personal data we hold about you, and you may object to our processing of it. In practice the app gives us nothing at all, so a request will normally concern an email you sent us. For the scanner diagnostics, contact Google, which holds them.

Write to the address below and we will respond. If you believe we have mishandled your data, you may also complain to your national data protection authority.

Data retention

App data stays on your device until you delete it, clear the app’s storage or uninstall Octo PDF Reader. Working copies are deleted when you close the document or the tool. Files you create stay wherever they were saved until you delete them. Google keeps the scanner diagnostics as long as its own policies allow. Emails you send us are kept only as long as needed to deal with your question, and are deleted on request.

Changes to this policy

If the app’s behaviour ever changes in a way that affects privacy — for example, if a future version added online features — this page will be updated and the date at the top will change. Material changes will also be noted in the app’s release notes on Google Play. The app shows a short version of this policy under Settings → Privacy policy.

Contact

For any question about privacy, or to make a request about your data, contact:

askaleks@gmail.com

Oleksii Khvatov