AAT Another Activity Tracker is a free, open-source GPS tracker for Android, built mainly for cycling and published by Lukas Bai under GPL-3.0-or-later. Version 1.30.1 was updated on March 2, 2026, and the app first appeared on December 1, 2015. It shows no ads and takes up 3.9 MB.
A cycling-first tracker with no price and no ads
The app records sporting activities by GPS, and its developer puts the emphasis on cycling. It costs nothing, carries no ads, and the source code is public on GitHub.
The tags on this listing also place it among location trackers and sharers, so recorded routes are meant to leave the app rather than stay locked inside it.
Cockpit views, GPX files and Waymarked Trails overlays
During a ride, live data can be shown in several cockpit and map views. Finished tracks are saved as GPX, a common format that other applications can read. Maps work offline or as downloaded tiles, and overlays for cycling and hiking routes come from Waymarked Trails.
Search and points of interest use Overpass and Nominatim. Offline POIs can be read from Mapsforge-compatible databases. A simple GPX editor handles quick route planning. The app also gives altitude information that does not depend on GPS, adds hill shading, and supports Bluetooth and internal sensors.
What to check before installing version 1.30.1
The minimum system is Android 5.1, and the package ID is ch.bailu.aat. If a specific Bluetooth sensor matters to you, check with the developer at bailu.ch/aat.
We host the unmodified APK. Its SHA-256 checksum is f10bae02e75b884c6e92e165e41c9cc92bff51d85c25aa01feddf68471080491, which you can compare against your download.
AAT Another Activity Tracker pros and cons
Pros
- Free with no ads
- Open source under GPL-3.0-or-later, with code on GitHub
- Saves tracks as GPX for use in other apps
- Offline maps and offline POIs from Mapsforge databases
- Small download at 3.9 MB
Cons
- Requires Android 5.1 or newer
- Version 1.30.1 has no published release notes, so changes between updates are hard to track
- Supported Bluetooth sensors are not listed
Is AAT Another Activity Tracker safe?
We host the unmodified APK as a Tier A file, and the SHA-256 checksum is listed so you can verify your download. The app is published by Lukas Bai, uses the GPL-3.0-or-later licence, and its source is open on GitHub. It has no ads. No independent security review is available, so check what Android asks for at install.
How to install AAT Another Activity Tracker
- Download the APK with the button on this page and wait for it to finish.
- Compare the file with the SHA-256 checksum shown here if you want to confirm it arrived intact.
- Open the file on your phone and allow installs from this source when Android asks.
- Finish the install, then open AAT Another Activity Tracker from your app drawer.
