I have been playing with some of Apple's on device APIs and it is white amazing what you can do without worrying about tokens or cloud infra structure (if you have a modern device with an M chip).
I built this because I kept reaching for the mouse just to tweak volume while my perfectly good MIDI controller sat there unused.
Now any knob or fader can control your Mac’s volume — system and Apple Music separately — right from the menu bar. Plug in your controller, hit “MIDI Learn,” twist a knob — done.
It’s tiny, local, and weirdly satisfying — no ads, no subscriptions, just works.
Runs fully offline using macOS Core MIDI and Core Audio APIs.
I built https://dxc4.com – a free chess analysis tool that doesn’t use servers or databases.
The entire analysis session (moves, variations, current position) is encoded in the URL itself. That means when you share a link, the recipient sees exactly what you see.
The Stockfish engines runs entirely in your browser via WebAssembly — so there are no server costs, no logins, no data leaving your device. Once loaded, it even works offline.