Which app is right for you
Two apps on Google Play, side by side. All of them work offline and hand their data back through export; they differ in what they do. The game stays out of the table: a puzzle is not a tracker.
Ready to install
Crystal Notes
Crystal Notes is a fast, local-first notes app for Android. Rich text, categories, search, export to PDF/Markdown/CSV/Excel, JSON backups. Data on the device.
BrainTox
BrainTox is an offline expense tracker for Android with sarcastic spending commentary. Track expenses, income and subscriptions, then export them to CSV or JSON.
Carton Collect
Carton Collect is a cozy offline match-3 puzzle game about cardboard items. Playable without internet, no account needed, progress stays on your device.
What the apps on Google Play have in common
The rows below cover the apps you can install today. The game stays out: a puzzle and a tracker answer different questions.
| Property | Crystal Notes | BrainTox |
|---|---|---|
| Account | not required | not required |
| Cloud sync | none | none |
| Data stays on device | yes | yes |
| Export | TXT, Markdown, CSV, PDF, Excel, JSON | CSV, JSON |
| Crash reporting | Sentry, note fields scrubbed | none |
Not the one you were looking for?
Write to hello@nexgenorbitlabs.com and tell us what is missing: a separate window on the phone, a shared calendar, one specific export format. Requests like that do reach the next version, and you will see it in the release notes on Google Play.