"AI fitness" means two different things: apps that use AI to decide your workout, and apps that use AI to measure it. Most do the first. Very few count your reps automatically — here's how the options actually compare, and where camera-based tracking wins.
Download on theApp Store| App | Rep counting | How | Form feedback | No wearable | Platform | Price |
|---|---|---|---|---|---|---|
| Spotwell | Automatic | iPhone camera (on-device computer vision) | Yes | Yes | iOS | Free + subscription |
| Fitbod | Manual log | You enter sets and reps | No | Yes | iOS, Android | Subscription |
| Apple Fitness+ | No | Guided video classes | No | No (Apple Watch) | iOS | Subscription |
| Freeletics | Manual / timed | Coach app, you confirm completion | Limited | Yes | iOS, Android | Free + subscription |
| Peloton App | No | Live and on-demand classes | No | Yes (optional HR) | iOS, Android | Subscription |
| Wearables (Apple Watch, Whoop) | Partial | Wrist motion / heart-rate sensors | No | No (device required) | Varies | Device + subscription |
Feature availability described at a general level as of 2026; verify current specs on each app's official site.
Point the iPhone camera at yourself and on-device AI counts reps and gives form cues — no watch, band, or manual tapping. Also does AI photo calorie tracking, so training and nutrition live in one app.
Best for Lifters who want their reps and form tracked automatically without wearing anything.
Strong at AI workout *programming* — it builds a session based on your history, recovery, and available equipment. Logging the reps themselves is still manual.
Best for People who want an algorithm to decide what to train each day.
Trainer-led video workouts with on-screen metrics from your Apple Watch. Great for follow-along classes; it does not count individual strength reps for you.
Best for Apple Watch owners who like following along with studio-style classes.
AI coach focused on bodyweight and HIIT programming. It adapts your plan over time, but you confirm what you did rather than having reps counted from video.
Best for Bodyweight and HIIT training with an adaptive plan.
Huge library of instructor-led classes across strength, cycling, and more. Motivation and coaching are the draw; automatic rep tracking is not the model.
Best for People motivated by instructors and class variety.
Excellent for heart rate, strain, and recovery. Wrist-based rep detection for free-weight lifting is limited and inconsistent compared with a camera watching your full range of motion.
Best for Tracking cardio, strain, sleep, and recovery.
Spotwell counts your reps automatically with the iPhone camera and logs meals from a photo — the training and nutrition bookkeeping, done for you. No wearable required.
Download on theApp StoreFor automatic rep counting without a wearable, a camera-based app is the most reliable option. Spotwell uses the iPhone camera and on-device computer vision to count reps and give form feedback, whereas most "AI fitness" apps focus on programming your workout and still rely on you logging reps by hand.
No. A wrist wearable can estimate some movement, but wrist-based rep detection for free-weight lifting is inconsistent. A phone camera that can see your whole range of motion counts reps more reliably, and it needs no extra hardware.
Most AI workout apps use AI for programming — deciding what exercises, sets, and reps you should do. An AI rep counter uses AI for tracking — measuring what you actually did. Spotwell does the tracking side with the camera, which is far less common than AI programming.
For clearly visible, full-range movements in decent lighting, camera-based counting is typically accurate to within a rep or two per set, and you can adjust any count manually. Accuracy is highest when your whole body is in frame at roughly a 45-degree angle.
Spotwell is free to start, with an optional subscription that unlocks unlimited scans and advanced plans. You can try automatic rep counting and photo calorie tracking without paying up front.