Android apps
I made some apps for Android, all of them free and open source.
Timer: Foto Timer & Meditation Timer | Bike: J-K Bike - Mechanical Disaster Prevention | Photos: Immich Uploader | Fitness: Gym Bott
Keep Android open!
If you own an Android phone, and you like using free, open source software, and you value freedom of choice, be advised that Google is planning to lock your phone down.
keepandroidopen.org has more information and some things you could do, whether you are a user or are otherwise invested.
Timer Photography
Foto Timer for Android - Latest: 2026-06-04 - v1.4.2 - Based on Foto Timer for PalmOS.
A versatile timer that can be used for almost anything. High level of customisation and flexibility. Uses seconds as the base unit.
Timer
Meditation Timer for Android - Latest: 2026-06-13 - v1.2.0 - Based on the old Meditation Timer app for Palm OS
A user-friendly timer that was made for meditation, but can be used for other tasks. Uses minutes as the base unit.
JK-Bike - Mechanical Disaster Prevention
Bike Maintenance
JK-Bike - Mechanical Disaster Prevention for Android - Latest: 2026-06-19 - v4.2.1
An app that helps build positive bike maintenance behaviours, for rides quick, big or epic. To prevent mechanical disasters happening on your rides, use this app to build better, new, habits and ensure your rides are (mechanically) glorious.
Photography
Immich Uploader - Latest: 2026-08-12 - v3.1.0
A small app that can upload images and videos to an Immich server. The server endpoint can be configured, and the app can automatically mark assets from certain places to be deleted after upload.
Fitness
Gym Bott - Latest: 2026-07-28 - v1.1.4
Gym Bott is a local-only exercise and routine tracking app designed to organize gym workouts in a simple and structured way.
Download
All my apps can be installed via F-Droid, or you can sideload them from this site.
"Design"
"Hey Jan! All your apps look the same!"
I know, right?!
I am not a designer, and I do not make any money with my apps, so I do not pay for a designer, either.
If you want, you can call it my "brand identity" if that is your kind of thing.