Small Android apps that do one thing well

No advertisements. No analytics. No trackers. No internet access unless the app genuinely needs it — and none of these do. Each one is a few megabytes, works offline, and follows your system theme.

The apps

Finished, tested and waiting on Google Play review. The store links below start working the moment each app is live.

Level Coming to Play

Bubble level, inclinometer and screen ruler. Reads in degrees, percent slope or mm per metre, and asks for no permissions at all.

Sound Meter Coming to Play

A-weighted decibel meter with an octave-band spectrum, recorded sessions, CSV export and honest safe-exposure guidance.

Unopened Coming to Play

Finds the people who asked you something and never got an answer. Every notification is sorted on the phone by a small model inside the app — nine languages, no server, no internet permission.

Yappo Coming to Play

A pronunciation coach that scores every sound you say: clear, close or missed. The speech model is inside the app, so it works offline, has no internet permission and nothing you say leaves your phone.

The rules every app follows

• Free, with no advertisements. Nothing on this page costs anything to use.
• No analytics, no crash reporting SDKs, no trackers. We do not know that you installed the app, let alone what you did with it.
• Only the permission the core feature needs. Level requests none at all. Sound Meter requests the microphone and nothing else. Unopened needs notification access, which is the one thing it cannot work without, and no internet permission with which to send anything.
• Nothing leaves your device. See the privacy policy, which covers every app on this page.
• Small. Typically under 2 MB.
• Honest numbers. Where a reading is an estimate, the app says so and says how far off it can be.

Support

Questions, bug reports and feature requests: contact@onllm.dev. Please include your phone model and Android version — it makes a real difference.