Simple Muscle
Simple Muscle is an iPhone workout planner and tracker that connects ChatGPT, Claude, and other compatible AI assistants directly to real workouts and training history, giving strength-training users AI-created routines plus native set logging, rest timers, exercise demos, progress history, and Live Activities. - The core workout tracker is free and works without AI. Simple Muscle connects to the AI assistant the user already pays for, avoiding another proprietary AI coaching subscription.
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Best for iPhone lifters who already use ChatGPT or Claude and want a clean, native tracker that plugs into their AI without extra coaching fees. It trades off built-in AI coaching for reliance on your own assistant. Skip it if you want a standalone AI coach with built-in guidance. apps like BodyMake AI or Kiron offer that.
What is Simple Muscle?
Simple Muscle is an iPhone workout planner and tracker that works on its own for logging sets, reps, rest, and workout history. The free version includes unlimited workouts, lock-screen Live Activity, rest timers, full history, charts, and offline use. For $5/month or $50/year, the Connected tier adds cloud backup, device sync, and direct integration with AI assistants like ChatGPT and Claude, letting your existing AI generate and update workouts using your logged data.
How we scored Simple Muscle
Simple Muscle delivers a solid, focused tracking experience with clean UI and structured history, earning ease‑of‑use and delivery points. It lacks built‑in AI coaching, which limits capability compared to standalone AI apps, and its value is good but not exceptional since you still need an external AI subscription. That mix leads to a total in the low 80s.
Pros and cons
What we liked
- Free core tracker with unlimited workouts, rest timers, history charts, lock‑screen Live Activity, and offline use.
- Low‑cost Connected tier ($5/month or $50/year) adds cloud sync and AI assistant integration.
- Clean, thumb‑friendly logging interface with two‑tap sets, Dynamic Island rest countdown, and structured history for AI analysis.
Where it falls short
- No built‑in AI coaching - relies entirely on your own assistant for plan generation.
- iOS‑only; Android users must use the web dashboard and lack native app features.
- Connected tier lacks advanced AI features like progression logic or form feedback that standalone AI fitness apps offer.
Key features
Simple Muscle pricing
| Plan | Price | Who it is for |
|---|---|---|
| Core workout tracker | Free | Unlimited workouts and exercises, lock‑screen Live Activity, rest timer, full history and charts, offline use. |
| Connected · Sync + AI | $5/month or $50/year | Dedicated ChatGPT, Claude, and other MCP assistant integration, cloud backup, device sync, AI‑driven plan creation and updates. |
Pricing reflects what we saw at time of review (2026-08). Always confirm current pricing on the tool's own site.
Who should use Simple Muscle?
If you already use ChatGPT, Claude, or another compatible AI assistant and want a clean, native iPhone tracker that plugs into your AI without paying for a separate coaching subscription, Simple Muscle fits well. It’s ideal for strength‑training users who prefer to keep their AI coaching and tracking tools separate. If you want a standalone AI coach with built‑in guidance, progression logic, and plan generation without needing to connect an external assistant, look at BodyMake AI or Kiron instead.
Simple Muscle alternatives
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Frequently asked questions
What does the free tier include?+
The free tier includes unlimited workouts and exercises, lock‑screen Live Activity, rest timer with notifications, full history and charts, and offline use.
How much does the Connected tier cost?+
The Connected tier costs $5 per month or $50 per year and adds cloud backup, device sync, and integration with ChatGPT, Claude, and other MCP assistants.
Which AI assistants does it support?+
The Connected tier supports ChatGPT, Claude, and other MCP‑compatible assistants via a dedicated connector link.
Can I use it without AI?+
Yes. The core tracker works fully without AI - logging, history, timers, and Live Activity all work offline and free.
Is it available on Android?+
Currently it’s iPhone‑only; Android users can use the web dashboard but miss native app features.
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