Hi, I'm Jonas!

Welcome to my cozy site. Here, you can see some information about my current projects and links to my social media. Furthermore, you can reach out to me on LinkedIn.

This Flutter app for iOS and Android let's you track your push-up sessions. Noticeaby, the background changes based on the user's latest performance and also improves readability for the settings and the session overview. You are also able to change the theme to your liking.

You have a feature request? Simply open a new issue on GitHub with the 'Feature' tag.

You have a theme idea? Just pick the extra on my buymeacoffee page. Don't worry, it's free!

This is the organization, where Daniel and I develop free and open-source software for businesses. Currently, there is a project planned, where restaurants can generate their digital menus for their website. You can check out the projects in the GitHub repository.

You like rowing? Then this one's for you. Just pick one of the bundled workouts like Steady State, Pyramid or Sprint Intervals, and the app walks you through each interval while keeping you on the right stroke rate. No signup, no fuss!

Getting married or throwing a party? Photo Collector is a fully static, self-hosted app that lets your guests share their photos and videos with you. Guests scan a QR code, open a web page — no login, no app install — and upload directly to S3-compatible object storage. There is no backend and no database.

The QR code embeds write-only credentials, so guests can only upload, never read or delete. A companion CLI generates print-ready QR cards with a heart-shaped design for your tables.

Privacy Policy for my Apps and Sites:

On all my apps, you are not being tracked beyond the optional Developer Tools from Apple and Google, which you can opt in and out yourself. Your data is processed and stored locally.