Today I experimented a bit with the Gemini CLI and the relatively new Gemini 3 Pro model, as well as with Claude Code and Opus 4.5. The task was: to create a web version of my iOS app Rechenfeld (with access to my app's code).

After about an hour of back and forth – with me refining, correcting, and adding to the design – I ended up with a surprisingly well-functioning web app. It's obviously much more streamlined than the native app, but the basic principle of the computational framework remains recognizable, and it runs stably in the browser. It's truly astonishing what can now be achieved with such AI models.

Since it would be a shame to keep this result only locally, I'm making the web version available here for you to try out:

www.lernsoftware-mathematik.de/rechenfeld

I also have one right away. experimental AI learning companion It includes built-in support based on Elevenlabs Agents, which can help with any questions. Feel free to try it out.

Similarly, a stripped-down web version of my soon-to-be-released version of the number line app has also been created, which is nevertheless quite usable:
https://lernsoftware-mathematik.de/zahlenstrahl/