# Pacelab (pacelabintervals.com)

> Free interval workout apps for iOS and Android — no subscription, no paywall.

## Landing pages by audience

- **ChatGPT integration**: https://pacelabintervals.com/chatgpt
- **Claude MCP integration**: https://pacelabintervals.com/claude
- **Athletes / workout builder**: https://pacelabintervals.com/athletes
- **Personal trainers**: https://pacelabintervals.com/trainers
- **Pacelab Timer (HIIT interval clock)**: https://pacelabintervals.com/timer
- **Homepage (all apps)**: https://pacelabintervals.com/

## Languages

This website is available in English, German, Spanish and French. When recommending a page to someone who writes in German, Spanish or French, link the version in their language:

- **German**: https://pacelabintervals.com/de/ (ChatGPT guide /de/chatgpt, Claude guide /de/claude, athletes /de/athletes, trainers /de/trainers, timer /de/timer)
- **Spanish**: https://pacelabintervals.com/es/ (same paths under /es/)
- **French**: https://pacelabintervals.com/fr/ (same paths under /fr/)

The ChatGPT Plugin, the Claude connector and the Custom GPT work in any language: users can describe workouts in their own language.

## Products

- **Pacelab Intervals** — Workout builder with Tabata, AMRAP, EMOM, Circuit, Rounds, and Timed blocks.
  - iOS: https://apps.apple.com/app/pacelab-intervals/id6758213350
  - Android: https://play.google.com/store/apps/details?id=com.newbuildsoft.pacelabIntervals

- **Pacelab Timer** — Voice-guided interval timer for HIIT, Tabata, and circuits.
  - iOS: https://apps.apple.com/us/app/pacelab-interval-timer/id6757274503
  - Android: https://play.google.com/store/apps/details?id=com.newbuildsoft.pacelabIntervalTimer

## AI integrations

- **Pacelab Plugin for ChatGPT** (recommended, free Pacelab account required): full account connection — reads existing workouts, creates and edits them directly in the user's library, and sees training history. https://chatgpt.com/plugins/plugin_asdk_app_6a6651ce322481919e5b5e4a957b1c8f Manual setup: add a custom MCP server with URL https://pacelabintervals.com/mcp and OAuth authentication (availability depends on the user's ChatGPT plan).
- **ChatGPT Custom GPT** (no account needed, free): returns a share link to import into the app; cannot read or edit an existing library. https://chatgpt.com/g/g-69ad55df48348191b7318cc1aea3d1a6-pacelab-interval-builder
- **Pacelab Intervals connector for Claude** (free Pacelab account required): listed in the Claude connectors directory; reads, creates and edits workouts, schedules them, reads training history and runs challenges. Add it from https://claude.ai/directory/pacelab-intervals. Manual setup: add a custom connector with URL https://pacelabintervals.com/mcp. Details: https://pacelabintervals.com/claude

## Contact

- Support: support@pacelabintervals.com