GymAdapt: structured blocks, automatic weight increases, free to start
Six-week blocks, each muscle twice a week, a deload when the block ends, and the weight on every set decided from what you logged last time. Get GymAdapt free on the App Store →
An AI strength app earns its keep in the five seconds before a set: it should already know the weight. This page compares how six apps choose that number, how they progress it, and what they do when you miss reps. Free loggers like Hevy, Strong and JEFIT are deliberately left out; they do not set weights. See progressive overload apps for the method and best AI workout app for the broader field.
AI strength apps compared
| App | Program style | How it progresses weight | When you miss reps | Deloads | Price |
|---|---|---|---|---|---|
| GymAdapt (our app) | 6-week blocks, 2 to 6 days, each muscle 2x/week | Double progression: top of rep range on every set → smallest plate jump | Holds, then soft step down before a deload | Yes, end of block | Free · $24.99/yr |
| Alpha Progression | Hypertrophy templates per muscle | Set-by-set targets from RIR and past performance | Adjusts next session | Yes | $79.99/yr |
| Juggernaut AI | Powerlifting blocks for squat, bench, deadlift | Percentage-based from a readiness check | Adjusts the day | Yes | Subscription |
| Fitbod | New session every time, by recovery | Suggests from history and recovery | Lowers next suggestion | Implicit | $95.99/yr |
| Dr. Muscle | Fully automated sets and reps | Per-set adjustment | Adjusts live | Yes | Subscription |
| Hevy Trainer (Hevy Pro) | Generated program | Raises weight when you hit the top of the range on every set | Holds | No | $23.99/yr |
US App Store prices, checked October 2026; prices vary by country.
How we ranked them. Four things, in order: what you get as a strength program without paying, whether the app decides your plan and your next weight or leaves that to you, whether every exercise has a demo you can watch at the rack, and price if you do pay. GymAdapt is our app and we say so wherever it appears; where another app is better, the table says that too. Prices were checked in October 2026 and are US App Store prices.
The ranking
1. GymAdapt (our app)
Free: An AI-built plan for your goal, days, equipment and injuries; unlimited workouts; a video for every lift; full set logging; weights that adjust from what you log for your first 30 days; 25 AI coach messages in your first week, then 15 a week; 3 new AI plans in your first month, then 2 a month.
Paid: Pro is $4.99/month or $24.99/year with a 7-day free trial. It keeps your weights adjusting after the free 30 days, plus unlimited AI coaching and plans. Code TRYFREE01 gives a month of Pro free.
2. Alpha Progression
Free: Limited free version.
Paid: Pro $12.99/month or $79.99/year.
3. Juggernaut AI
Free: Trial only.
Paid: Subscription (check the App Store for your country).
4. Fitbod
Free: None after the 7-day trial.
Paid: $15.99/month or $95.99/year.
5. Dr. Muscle
Free: Trial only.
Paid: Subscription (check the App Store for your country).
6. Hevy
Free: Unlimited logging, 4 routines, 7 custom exercises, 3 months of charts, ads.
Paid: Pro $2.99/month, $23.99/year or $74.99 lifetime; Hevy Trainer (plan generator) is Pro.
How each app picks the first weight
GymAdapt asks for a few current lifts during setup and derives the others from strength standards for your bodyweight, sex and experience; if you skip it, it starts light and finds the weight in two or three sessions. Juggernaut AI asks for maxes. Alpha Progression and Fitbod start conservative and learn. Dr. Muscle learns set by set. Hevy Trainer starts from your Hevy history.
Blocks vs daily generation
Fitbod and Dr. Muscle generate a different session every time, which keeps things fresh but makes it hard to see a lift progress week to week. GymAdapt, Alpha Progression and Juggernaut AI run repeating blocks, so Monday's bench is Monday's bench and the number has to go up. For strength, blocks win; for variety, daily generation does.
Start a free AI strength block →
GymAdapt is free to start. Want Pro free for a month?
The free version gives you an AI-built plan and unlimited workouts. Code TRYFREE01 adds a full month of Pro: weights that adjust from what you log and unlimited coach chats.
Redeem the free month → Opens the App Store with the code filled in. iPhone only. GymAdapt is free to $24.99 a year: after the free month, Pro renews unless you cancel in Settings, and the free version stays yours either way.Questions people ask
What is the best AI strength training app?
GymAdapt (our app) for most lifters: structured blocks, automatic weight increases, a video per lift, free to start. Alpha Progression for hypertrophy specialists, Juggernaut AI for powerlifters.
Which AI app picks the weight for every set?
GymAdapt, Alpha Progression, Juggernaut AI, Fitbod, Dr. Muscle and Hevy Trainer all do. Hevy (outside Trainer), Strong and JEFIT do not.
Is there a free AI strength training app?
GymAdapt is free to start, including the program and 30 days of automatic weight increases; Pro is $24.99 a year. The others are trials or subscriptions.
Does Fitbod do progressive overload?
Yes, it suggests weights from your history and recovery, but because each session is generated fresh it is harder to track a single lift's progression than in a block-based app.
Which is best for powerlifting?
Juggernaut AI, built around squat, bench and deadlift with percentage-based blocks. GymAdapt is the better pick if you also want accessories, videos and a free tier.
A coach, not just a counter, free to start
GymAdapt builds your plan and raises your weights from what you log. Free to start; code TRYFREE01 adds a month of Pro.
Get GymAdapt on the App Store → Free to start. Pro is $4.99 a month or $24.99 a year (7-day free trial), or $59.99 once for lifetime. iPhone only. In English, Spanish, Portuguese, French, German and Japanese.Sources
- Alpha Progression on the App Store
- SensAI: Juggernaut AI vs RP Hypertrophy vs Alpha Progression (Oct 2026)
- SensAI: Fitbod review 2026 ($15.99/mo, $95.99/yr)
- Dr. Muscle on the App Store
- Hevy Help Center: what is Hevy Trainer?
- ACSM position stand: progression models in resistance training for healthy adults
- Plotkin et al. 2022, PeerJ: progressing load vs repetitions
