Parameter
Coming soon
HOW IT WORKS

Connect your AI.

Two minutes, one URL. Revoke it anytime, in one tap.

YOUR AI
Claude, ChatGPT, any MCP client

Writes plans, reads history, only when you ask.

MCP SERVER
Keeps no workout data

Passes messages between your AI and your iCloud. Keeps none of them.

YOUR ICLOUD
Holds everything

Your private database, keyed to your Apple ID. We can't read it.

IPHONE + WATCH
Where you train

Execution, logging, haptics. Works offline; syncs when it can.

The same diagram, annotated hop by hop, on Privacy.

Setup, step by step

https://mcp.parameterfit.com/mcp

Paste this into your client's connector settings.

  1. 01 In claude.ai, click your initials in the bottom-left corner, then Customize → Connectors → Add custom connector, and paste the URL above. The free plan allows one custom connector; paid plans allow more.
  2. 02 A sign-in window opens. Sign in with the same Apple account as the phone where Parameter is installed, and check "Keep me signed in."
  3. 03 Ask for a plan. It appears in Parameter, on phone and watch.

Works in Claude on the web, iOS, and Android; the connector follows your account.

  1. 01 In Claude Desktop, open Settings → Connectors → Add custom connector and paste the URL above. Connectors added on claude.ai appear here automatically.
  2. 02 Sign in with the same Apple account as the phone where Parameter is installed, and check "Keep me signed in."
  3. 03 Ask for a plan. It appears in Parameter, on phone and watch.
  1. 01 In ChatGPT (Plus or Pro), open Settings → Apps & Connectors, turn on Developer mode under Advanced settings, then choose Create and paste the URL above.
  2. 02 Sign in with the same Apple account as the phone where Parameter is installed, and check "Keep me signed in."
  3. 03 Ask for a plan. It appears in Parameter, on phone and watch.

These clients are adding remote MCP support at different speeds, and we haven't independently verified exact menu paths for each. Look for a connectors, extensions, or tools setting.

  1. 01 Find the setting for adding a remote tool, connector, or MCP server, usually under the client's extensions or connected-apps settings, and paste the URL above.
  2. 02 Sign in with the same Apple account as the phone where Parameter is installed.
  3. 03 If your client doesn't yet support custom remote MCP servers, use the generic MCP steps as a fallback once it does.

Unverified: check your client's own documentation for the current menu path.

Any client that speaks MCP over HTTP works. Parameter doesn't care which brain is on the other end.

  1. 01 Add the endpoint above as a remote MCP server (streamable HTTP).
  2. 02 Authorize by signing in with the same Apple account as the phone where Parameter is installed.
  3. 03 Tools exposed: push_plan · push_workout · update_workout · get_history · get_profile · get_equipment

Every connected AI is listed in Parameter under Settings → AI connection. Revoke any of them in one tap.

Prompts to steal

The pattern is conversation, not configuration. Start with any of these.

“Plan my next four weeks. 10k in September, lifting Tuesday and Thursday.”
“Look at my last three weeks. Am I progressing?”
“Swap Thursday to a hotel-gym workout.”
“Make next week easier. I'm run down.”
“What PRs did I set this month?”
“I fly Tuesday. Plan around it.”

More of these, with what appears in the app, on Why Parameter.

Does my AI act without asking?

No. Plan writes require your approval in the app the first time, and every connected AI is visible in Settings.

How do I revoke access?

Settings → AI connection → Revoke. One tap, effective within about a minute. Your data doesn't move.

Does it work offline?

Training does. Execution and logging never need a connection. The AI link syncs when you're back online.

All questions

Two minutes from now, you have a coach.

Coming soon to the App Store

Requires iPhone (iOS 17+). Apple Watch recommended.