Your AI plans it.
Parameter runs it.
No AI inside. You bring the one you already talk to. Parameter is the body: it runs every set, segment, and rest day on your iPhone and Apple Watch.
Requires iPhone (iOS 17+) · Apple Watch recommended
Works with Claude, ChatGPT, and any MCP client
Connect once. Then just talk.
Connect your AI
Add Parameter to Claude, ChatGPT, or any MCP client. One URL, one approval. Revoke it anytime, in one tap.
Ask for a plan
Describe your goal the way you'd tell a coach. Your AI writes the plan straight into Parameter: every set, segment, and rest day.
Train on phone and watch
Segments auto-advance, rest timers run, every set is logged. Your AI reads the results and plans the next week.
Stop stacking two apps.
Strength, intervals, a class, an easy run. One plan, one log. Rest days are first-class, not empty gaps.
Real app components, real states. A skipped day renders gray. Never red, never "you missed it."
Serious on your wrist.
Full execution on the watch: live heart rate, a distinct haptic for every event, and logging without touching your phone.
Auto-advancing intervals
Segments change with a haptic countdown. Zone alerts buzz when you drift.
Context on every set
Previous performance sits under each set. Check off, adjust, move on.
Rest timers on the wrist
The phone stays in the bag. Mirroring keeps both in sync anyway.
The boring parts, done right.
That's the whole business model. The app is free: logging, execution, watch, history, export. The dollar buys the AI connection.
Your data lives in your own iCloud database. The AI Connector stores no workout data. We couldn't read your logs even in principle.
No sign-up, no email, no password. Revoke any connected AI in one tap. Delete everything in one tap. Export is free, forever.
Do I need an Apple Watch?
No. Everything runs on the phone; the watch is recommended, not required.
Which AIs work?
Claude on the web, desktop, and mobile, plus ChatGPT and any MCP-compatible client.
What happens to my data?
It stays in your iCloud. Export it all as JSON anytime, free. Delete means delete.
"I built Parameter because I wanted it to exist: one app for every kind of training, planned by the AI I already talk to, with my data in my own iCloud. No growth team. No funnels. Just the app."
Your AI already knows how to coach.
Give it something to run on.
Requires iPhone (iOS 17+). Apple Watch recommended.