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AI personal trainer apps, compared
"AI personal trainer" now covers three quite different things, and most of the confusion comes from mixing them up:
- Apps that write your training — you tell it your goal, equipment and schedule, and it produces the sessions and the weights. This is where trainerX and Fitbod sit
- Apps that record your training — you write the program, they log it beautifully. Hevy and Strong, and they're very good at it
- Human coaching with software attached — a real coach writes your plan and the app delivers it. Caliber, Future and most online coaching
If you already know what you're doing, you want the second kind, and you should probably stop reading and go and get Hevy. If you don't, you want the first or the third.
The short version
| App | Best for | What it costs (2026) |
|---|---|---|
| trainerX | Getting back into the gym after a break, when you want the plan and the weights decided for you | $19.99/mo or $119.99/yr (7-day free trial) |
| Fitbod | Generated gym sessions around whatever equipment you have | $15.99/mo or $95.99/yr |
| Hevy | Logging training you already know how to program | Free tier; Pro a few dollars a month |
| Strong | The same, with a long-standing, very simple interface | Free tier; paid upgrade |
| Caliber | A real human coach, at a lower price than in-person training | Free self-guided tier; coaching from around $150/mo |
| Future | One-on-one remote coaching with a named coach | Around $199/mo |
| Freeletics | Bodyweight and minimal-equipment training, at home or traveling | Around $13/mo |
| Runna | Running plans, with strength work attached | Around $18/mo |
Prices are indicative and change often — check the App Store before you buy.
The ones that write your training for you
trainerX — we make this one
Built for people getting back into the gym after months or years away. You tell it your goal, your days, how long you've got, the equipment your gym has and anything your body objects to. It writes each session — pairing a lower-body exercise with an upper-body one so the session fits in 45 minutes — suggests the weight for every set, and adjusts both based on what you actually lifted and how hard you said it felt. You can ask it questions mid-session like you would a trainer, swap an exercise when a machine's taken, and it reminds you on the days you said you'd train. Miss a week and it rewrites the plan rather than resetting your progress.
Who it's not for: people who already know exactly what they want to run and just want to log it — Hevy does that better and costs less. Anyone training mainly at home with no kit is better served by Freeletics. And if your goal is a marathon, use Runna.
Fitbod
The best-known app in this category, and it's good. It builds gym sessions around the equipment you have and your recent training, and it's strong on variety. It's also cheaper than us. Where we differ: Fitbod generates sessions, and we build a plan around a comeback specifically — your history away from training, the joints you've flagged, the week you actually have. If you're an experienced lifter who wants a session generated on demand, Fitbod is an excellent choice.
The ones that record your training
Hevy and Strong
Both are excellent logging apps with generous free tiers, and if you already know how to program your own training, one of them is all you need. Hevy has the better free tier and a social side; Strong has been around longer and is beautifully simple.
Neither will tell you what to do. That's not a criticism — it isn't what they're for. But it's the reason people coming back after years off often download one, log three sessions, run out of ideas and stop. If "what should I do today?" is your actual question, a logger won't answer it.
The ones with a human attached
Caliber and Future
If what you want is a real coach, these are the closest you'll get without meeting one in person. Future pairs you with a named coach who writes your week and messages you; Caliber has a free self-guided tier and paid one-to-one coaching above it.
They cost considerably more than an app — Future is around $199 a month — but considerably less than in-person training twice a week. If you want a person, get a person. We've written up what a personal trainer actually costs, including when it's worth paying for.
How to choose, in four questions
- Do you know what to do at the gym? If yes, get a logger (Hevy, Strong). If no, get an app that writes your training (trainerX, Fitbod)
- Do you need someone to watch your form? If that's the real problem, no app fixes it. Book a few sessions with a coach, then use an app for the rest of the year
- Where are you training? Gym with kit: trainerX or Fitbod. Front room with a mat: Freeletics
- What's the goal? Getting back into the gym: trainerX. A race: Runna. General fitness: Nike Training Club, which is free and very good
What "AI" actually means in these apps
It's worth deflating the term, because it's doing a lot of marketing work across the whole category.
In practice, AI in a training app means one or more of these: choosing exercises from a library to fit your equipment and goal; adjusting weights and volume based on what you logged; interpreting how hard a session felt; and answering your questions in plain English. That's genuinely useful, and it's what a good coach does between sessions.
What it doesn't mean: it can't see you, so it can't correct your technique from across the room. It can't diagnose an injury. And it can't make you go. Any app claiming otherwise is overselling.
If you're coming back after a long break
That's the group we built for, and it's worth saying what the difference actually is. Most apps assume you're continuing. A comeback is different: you don't know what weights to start with, you're more likely to overdo the first fortnight, and the plan needs to survive a missed week rather than punishing you for it.
Our guide to getting back into the gym after a long break has a full session and the reasoning behind it, free and with no sign-up. If you'd rather have it built around you, that's the app.
7 days free, then $19.99 a month or $119.99 a year. Cancel in two taps.
FAQs
What's the best AI personal trainer app?
It depends which job you need doing. For generated gym sessions built around a comeback, trainerX (ours) or Fitbod. For logging training you already program, Hevy or Strong. For a real human coach remotely, Caliber or Future. For running, Runna.
Are AI personal trainer apps any good?
For programming and progression, yes — deciding what you should lift today, based on what you lifted last time, is exactly the kind of problem software handles well. For technique correction and injury rehab, no. Those still need a person.
How much do AI personal trainer apps cost?
Most sit between $5 and $25 a month, with annual plans cheaper per month. Apps with a human coach attached start around $150 a month. In-person personal training is roughly $280 a month for one session a week.
Is an AI personal trainer as good as a real one?
Not for everything. A good trainer watches how you move, adapts in the moment and holds you to account face to face. An app is better at programming consistency, costs about 1% as much, and is there at 6am. Plenty of people use both: a few sessions to learn the lifts, then an app for the rest of the year.
Which app is best if I haven't trained for years?
Look for one that asks how long you've been away, sets your starting weights for you, and handles missed sessions without resetting your progress. That's what we built trainerX to do. Whichever you pick, start lighter than feels sensible — see our comeback guide.
Is there a free AI personal trainer app?
Hevy and Strong have good free tiers for logging, Nike Training Club is free with guided workouts, and Caliber has a free self-guided tier. Apps that write and adapt a full program for you generally charge, because that's the expensive part to run.