Privacy Policy — Xenon54 Universal Tracker

Last updated: 11 August 2026

Xenon54 Universal Tracker ("the app") is a local-first personal organiser developed by Xenon54. This document explains exactly what data the app collects, where it goes, and what control you have over it.

TL;DR — Your data lives on your device. The only network sync is your own Google Drive, only when you sign in, and we never see or store any of it.

1. Data we collect

We do not operate any backend server. The app does not transmit any data to servers controlled by the developer. Specifically, we do not collect:

Account identifiers, email addresses, names, or contact information.
Device identifiers (IMEI, advertising ID, etc.).
Crash reports, analytics, or usage telemetry.
Location data.

2. Data you create

Everything you enter — killzones, trades, subscriptions, brain-dump notes, grocery items, body / nutrition logs, and reminder settings — is stored locally on your device using the platform's local storage. It never leaves the device unless you opt in to Google Drive sync (see §3).

Microphone and voice notes

If you grant microphone access and record a voice brain dump:

An audio recording (.m4a) is saved in the app's private documents folder on your device only, so you can replay the note later.
A transcript is created only if you tap the transcribe button on the note, and is produced entirely on-device by a bundled speech model. Your audio is never sent anywhere for transcription. The first transcription downloads the model file (~150 MB) from Hugging Face — that request fetches the model only and carries none of your data or audio.

Recordings are never uploaded anywhere — they are excluded from Drive sync and backups. Deleting a voice note (or uninstalling the app) deletes its recording. Microphone access is optional; typing works without it.

3. Optional Google Drive sync

If you sign in to Google from the Profile screen, the app uses Google Sign-In to authenticate with your account and the Google Drive API to read and write a small number of JSON files, all inside the hidden appDataFolder of your own Drive — a private area only this app can see, invisible to other apps and to your normal Drive file list:

Backup file — a serialised copy of your app data, written when you tap "Back up" and read when you tap "Restore".
Per-tab sync files — one JSON file per section you enable for sync (killzones, spend, capture, household, body, trading). Signing in with the same Google account on another device syncs these sections there too.

These files are owned by your Google account. The developer has no access to them, no copy of them, and no way to read them.

The only OAuth scope requested is:

https://www.googleapis.com/auth/drive.appdata — read/write access to the app's own hidden data folder, and nothing else in your Drive. The app cannot see, modify, or share any of your other Drive files.

4. Limited Use disclosure

Xenon54 Universal Tracker's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Specifically:

Data obtained through the Google Drive scope is used only to provide and improve the app's backup and cross-device sync features that are visible to you.
We do not transfer this data to any third party.
We do not use this data for advertising.
No human reads this data, except with your explicit consent for a specific support request, to comply with applicable law, or as part of security operations.

5. Sharing with other people

The app has no sharing features. Your data is never made visible to any other person or account — sync is strictly between your own devices, signed in to your own Google account.

6. Notifications

Reminders (killzone start alerts, brain-dump reminders, daily review) are scheduled by the OS. Notification contents are constructed entirely on-device from your own data. No notification content is transmitted anywhere.

7. Children's privacy

The app is not directed at children under 13. We do not knowingly collect any information from children.

8. Your controls

Reset the app from the Profile screen to wipe all local data.
Sign out from Google to stop all Drive sync. Signing out also revokes the OAuth grant, so the next sign-in re-prompts for account selection and scope consent.
Delete the app's hidden Drive data from Google Drive → Settings → Manage apps → Xenon54 Universal Tracker → "Delete hidden app data".
Uninstall the app to remove all local data from your device.

9. Changes to this policy

Material changes will be reflected by updating the date at the top of this document. The current version is always the one shipped in the published app binary.

10. Contact

Questions or concerns: open an issue at github.com/ryanabhii/brain_dump/issues or email contact@ryanabhii.me.