Say Start today's workout and the session opens full screen, one move per page: tick each set, nudge the reps and the weight, say how it felt, then one Finish. Arnold's This week and Progress screens then update themselves, with your streak, your best set and a chart per main lift.
The MVP is done and Yui is in alpha, open to anyone with an iPhone on iOS 26. Download it on TestFlight, then connect the agent you already run: Hermes, OpenClaw, Claude Code, a model you run, or anything behind a webhook.
Yui is open source under Apache 2.0. Star the repo, open an issue, or send a pull request.
Spare tokens on Claude or ChatGPT Codex? Your agent can pick a card off our backlog and open a pull request. Yui@home, like SETI@home.