The short version
NeuroTone collects nothing, sends nothing, and works entirely offline. There are no accounts, no analytics, no advertising, and no trackers. Everything you do stays on your device.
This is not a statement of intent — it is a property of the build. The app does not request the INTERNET permission, so it is technically incapable of transmitting anything anywhere. That is verifiable from the app itself, not just from this page: the permission list Android shows you contains no network access.
1. What the app stores, and where
All of it is stored locally, in the app's private storage:
| Data | Purpose | Where |
|---|---|---|
| Session history | Which frequency you played, its target and carrier in Hz, whether it was binaural or a pure tone, how long you planned and how long you actually listened, start and end time, volume and balance | On-device database (Room) |
| Theme, palette, and wallpaper-colour choice | Renders the app the way you chose | On-device preferences (DataStore) |
| Default duration, default volume, fade-out length | Pre-fills the next session | On-device preferences |
| Keep-screen-on and screen-dim settings | Controls the session screen's behaviour | On-device preferences |
| Onboarding completion and the version of the safety text you accepted | So onboarding is not shown again, and so you are re-shown the safety text if it materially changes | On-device preferences |
None of it is transmitted. None of it is readable by other apps. Android backup is explicitly disabled (allowBackup="false"), so it is not copied into cloud backup either — you own any backup yourself, through the CSV export below.
No profile is collected. The app never asks your name, age, gender, email, or any body measurement. It has no sign-up because it has no server.
2. What the app does not do
- Does not collect or transmit personal information
- Does not use analytics, telemetry, crash reporting, or attribution SDKs
- Does not contain advertising, and contains no advertising SDK
- Does not use an advertising ID
- Does not request location, contacts, camera, microphone, or storage-wide access
- Does not create an account or ask for an email address
- Does not track you across apps or websites
- Does not have network access at all
- Does not connect to Health Connect, Google Fit, or any health platform
3. Permissions
Three permissions are declared, and all three exist to play audio.
| Permission | Why |
|---|---|
POST_NOTIFICATIONS |
A playing session runs as a foreground service, and Android requires it to show a notification. That notification is also the transport: pause, resume and stop without reopening the app. It is requested at the point of use, not at startup. Decline it and playback still works; you simply lose the notification controls. |
FOREGROUND_SERVICEFOREGROUND_SERVICE_MEDIA_PLAYBACK |
So a session keeps playing with the screen off or another app in front. Neither is a runtime permission; Android does not prompt you for them. |
A fourth entry may appear in technical permission listings: com.zenocanvas.neurotone.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION. It is defined by this app for itself by one of Google's own AndroidX libraries, at signature protection level, and grants nothing to anyone who is not signed with the same certificate. It requests nothing from you or from the system.
Notably absent: INTERNET, and also BLUETOOTH / BLUETOOTH_CONNECT. Headphone detection uses AudioManager.getDevices(), which needs no permission at all — so the app can tell a wired headset from Bluetooth LE Audio without being able to see your paired devices.
4. Third-party services
There are none. No SDKs, no libraries that phone home, no review prompt, no crash reporter. The dependency list is Android's own Jetpack libraries plus Hilt and Room, all of which run entirely on-device.
5. Leaving the app — all user-initiated
Two places in NeuroTone hand something to another app. In both cases you start it, you choose the destination, and NeuroTone uploads nothing itself:
- Export sessions as CSV — you tap Export, pick a location through Android's own file picker, and the app writes your session history there. No storage permission is involved, because the picker grants access to that one file. The file is yours.
- Send feedback — opens your email app with a blank message to info@zenocanvas.online. Nothing is attached automatically; whatever you type is between you and your mail app.
The Settings → Privacy policy link opens this page in your browser. That is an ordinary web request made by your browser, not by NeuroTone.
6. Children
The app collects no data from anyone, including children. It contains no ads, no purchases, and no user-generated or third-party content. It is not directed at children, and it carries a safety acknowledgement that assumes an adult reader.
7. Safety and health
NeuroTone is a sound generator for relaxation and focus practice. It is not a medical device and does not diagnose, treat, or cure any condition. The description attached to each frequency describes what people report using it for; it is not a claim about what it will do for you, and no efficacy claim is made anywhere in the app or its listing.
Before first use the app requires you to read and acknowledge a safety notice: do not use while driving or operating machinery; consult a doctor first if you have epilepsy or any seizure disorder, a pacemaker or other implanted device, or if you are pregnant; start at a low volume, because sustained listening at high volume can damage your hearing; and stop if you feel dizzy or unwell. That notice is versioned — if it materially changes, you are shown it again rather than the change passing silently.
8. Deleting your data
Uninstalling the app removes everything it stored. Within the app, Settings → Clear all data erases every session and resets every setting, behind a double confirmation. Be aware that it also resets your onboarding and safety acknowledgement, so the app will show the safety notice again afterwards — that is intended, not a fault.
9. Changes to this policy
If a future version changes what the app stores or gains network access, this document will be updated before that version ships, and the "Last updated" date above will change.
For transparency: a future version may introduce advertising — the layout reserves three inert positions for it. Doing so would require adding the INTERNET permission, which would make the current "no data collected" declaration false. That release would carry its own updated policy and updated Play data-safety answers before rollout. v1.0 contains no advertising code whatsoever.
10. Contact
Questions about this policy — the same address the in-app Settings → Send feedback link uses:
Zeno Canvas
Dhaka, Bangladesh
Email: info@zenocanvas.online
Last updated: 9 September 2026