Free interval workout app
Mix Tabata, AMRAP, EMOM, and circuit blocks in one session — or describe your workout to ChatGPT or Claude and open it in Pacelab with one tap.
What makes Pacelab different
Most interval timers do one thing. Pacelab lets you mix block types in a single session — and edit on the fly.
Tabata, AMRAP, EMOM, Circuit, Rounds, and Timed. Combine any of them in one workout.
100+ exercises, progressive reps across rounds, voice-guided timers, and rep- or time-based blocks — whatever your program needs.
Send any workout as a link. Friends and clients tap it on their phone — workout opens straight in the app.
AI integrations
Describe what you want — duration, equipment, focus, intensity. The AI builds a complete workout and gives you a share link that opens in Pacelab.
"Build a 20-minute kettlebell EMOM, 4 exercises, progressive reps."
Made for
Same app, different starting points.
Athletes
Build your own workouts
Six block types, your way.
Personal trainers
Program & share with clients
One-tap share links.
ChatGPT users
Generate with a Custom GPT
Plus or Pro required.
Claude users
Connect via MCP
Claude Desktop + Node.js.
Simple timer
Pacelab Timer
HIIT clock only — no builder.
Free on iOS and Android. No account required.
Looking for the simpler timer? Pacelab Timer landing page →
Voice-guided HIIT timer — work/rest, sets, rounds. No builder, no account.