Your coach lives in ChatGPT.
Your training lives here.
Chalk has no AI of its own. That's the point. The ChatGPT, Claude or Gemini you already pay for knows your goals, history and limits. Chalk turns its plans into a clean, structured tracker, so you just train and log.
Works with ChatGPT · Claude · Gemini
This week
4
Sessions
18.2k
Volume
56
Sets
Push Day A
Main workout
Bench Press
+ Incline DB Press, Cable Fly…
Three steps, then forget about it.
Connect once
Generate your connector link and add it to ChatGPT, Claude or Gemini. A one-time, 30-second setup.
Coach as normal
Plan your training with your AI coach like you already do. When it builds a block, it syncs straight into Chalk.
Train & log
Your workouts are waiting in the app. Log your sets, and your coach can read them back to adapt next week.
Bring your own AI.
Works with the ChatGPT, Claude or Gemini you already pay for. Here's the whole setup.
One link · about 3 minutes · you only do it once
- 1In Chalk, tap Settings → Connect your AI coach and copy your link.
- 2In ChatGPT: Settings → Apps & Connectors → Advanced, turn on Developer mode.
- 3Add a connector, paste your link, set authentication to None.
- 4Ask any chat: “Build me a 4-week plan in Chalk.”
Not ready to connect? Start logging today and add your AI whenever you like.
Questions, answered.
Is Chalk another AI fitness app?
No. Chalk has no AI inside at all. The ChatGPT, Claude or Gemini you already pay for is the coach; it knows your goals, injuries and history. Chalk is the structured tracker it writes plans into and reads results from.
How does my AI write workouts into Chalk?
You generate a private connector link in Settings and add it to your assistant once, in about three minutes. From then on, any chat can build training blocks in Chalk, update your plan mid-week, leave coaching notes, and read your logged sets to adjust next week.
What can I track?
Strength sets with weight, reps and RPE, plus PRs and streaks. Cardio with distance, time, pace, heart rate and calories. Sports like football, padel, squash, tennis and swimming. There's a rest timer, offline logging for basement gyms, and week-by-week history.
Is my data private?
Yes. Your training data is locked to your account at the database level and stored in the EU. No ads, no selling data, no AI training. Friends only ever see your weekly session count and streak. You can export everything as JSON or delete your account anytime.
How much does it cost?
Chalk is free while in early access. You bring your own AI subscription, so there's no per-message AI fee hiding anywhere.
Do I need to be technical?
No. If you can paste a link, you can set up Chalk. Each assistant has a step-by-step guide with every click spelled out.