Dr. Muscle is a workout app that positions itself as a "pocket personal trainer," using AI to build and continuously adjust strength-training programs based on what a user actually lifts. Exercise scientist Dr. Carl Juneau founded the company in 2016 after finishing his PhD.
Instead of a fixed program, Dr. Muscle logs every set a user completes and recalculates the next session's weights, reps, and rest periods based on that performance history, aiming to auto-progress or auto-deload a lift the way an in-person trainer would adjust a session on the fly. In January 2026 the company began rolling out Dr. Muscle X, a progressive-web-app rebuild of the original app, in early access.
Dr. Muscle fits people who lift weights and want programming decisions handled for them rather than following a static spreadsheet. A free plan with limited features is available after an initial trial period; the premium subscription costs $48.99 a month for full auto-adjusting programming and unlimited exercise logging.
Key features
Real-time weight, rep, and rest-period adjustment based on logged sets
Automatic progression and deload calculations
Exercise library with instructional videos
Dr. Muscle X progressive-web-app rebuild in early access
Workout history and strength-trend tracking
Offline workout logging
Screenshots & demo
Demo video
Screenshots
Pricing
Dr. Muscle has a free plan, and paid plans start at $48.99/mo.
Pricing is provided as a guide. Check the official site for the latest plans.
Is Dr. Muscle expensive?
Dr. Muscle starts at $48.99, which is 367% above the Fitness & Wellness AI median of $10.5 a month across the 14 priced tools we list in that category.
The cheapest paid option in Fitness & Wellness AI starts at $2.99 and the most expensive at $199.
68% of Fitness & Wellness AI tools in the directory offer a free tier, and this is one of them.
Compared against every priced listing in Fitness & Wellness AI, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.
Pros & cons
Pros
Adjusts programming automatically instead of requiring manual planning
Built by an exercise scientist with a specific training methodology
Free plan available after the trial period, not a hard paywall
Long track record since 2016 in a crowded fitness-app market
Cons
Premium subscription price runs higher than most fitness apps charge
Free plan trims features that make the AI programming most useful
Auto-adjusting programming works best for structured strength training, less for other workout styles
Dr. Muscle X rebuild is still in early access as of 2026
Dr. Muscle is a workout app that positions itself as a "pocket personal trainer," using AI to build and continuously adjust strength-training programs based on what a user actually lifts.
Is Dr. Muscle free?
Yes, Dr. Muscle offers a free plan. Paid plans unlock more features and higher usage limits, starting at $48.99/month.
How much does Dr. Muscle cost?
Dr. Muscle starts at $48.99 per month. See the pricing plans above for full details.
What are the best Dr. Muscle alternatives?
The closest matches in the directory are Fitbod, GymBuddy AI, and Freeletics, compared side by side above.
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