Squat counter app Powered by AI.
REPS counts squats using AI computer vision through your iPhone's camera. The AI tracks your hip and knee joint angles in real-time, verifying proper depth on each rep before counting. No manual logging, no wearable, no guesswork.
This page explains the technology behind AI squat counting, optimal camera positioning, form requirements for accurate counting, and troubleshooting tips if you're getting undercounts.
Computer vision squat tracking explained.
AI squat counting tracks your body through the full squat movement using skeletal keypoint detection. The critical joints for squat tracking are hips, knees, and ankles. The AI monitors the angle at your knee joint and the depth of your hip crease relative to your knee. When your hip crease passes below the top of your knee (parallel or below), the bottom position is registered.
The squat counting sequence works like this: standing position detected (legs straight, hip angle open), descent phase (knee angle decreasing, hip angle closing), bottom position (hip crease at or below knee level), ascent phase (knee angle increasing), and standing position regained. One complete cycle = one counted squat.
Squat depth is the most debated form element in fitness. REPS uses a reasonable threshold — the AI looks for sufficient depth to constitute a real squat, not a quarter squat. If you're consistently getting undercounts, it usually means the depth isn't reaching the threshold. This is valuable form feedback — your app is telling you to squat deeper.
Step by step.
Full Body Camera View
Position your iPhone to capture your full body standing. The camera needs to see from your head to your feet — a front or side angle works best for squats.
Joint Angle Tracking
The AI tracks hip, knee, and ankle angles in real-time. As you squat down, it monitors the decreasing knee angle and hip position relative to your knees.
Depth Verification
The AI checks that your hip crease reaches below the top of your knee — proper squat depth. Quarter squats and half squats may not register because they don't complete the full movement pattern.
Rep Counted on Stand
When you return to full standing position (knees extended, hips open), the rep is counted. One complete descent + ascent with proper depth = one squat.
Get the most out of it.
Best Camera Angle for Squats
Side view or 45-degree angle. The camera needs to see your hip crease relative to your knees. A direct front view works but side angle gives the AI more depth information.
Proper Squat Form for Counting
Feet shoulder-width apart, toes slightly out, sit back and down, hip crease below knees at the bottom, drive up to full standing. Keep your chest up — this helps the camera see your hip position.
Common Squat Counting Issues
Not reaching depth (the #1 reason for undercounts), camera too close (can't see full body), or poor lighting (camera struggles to detect joints). Check these before assuming the counter is wrong.
High-Rep Squat Sets
The AI handles high-rep sets well because squats are a clear up-down movement. Just maintain consistent form — as fatigue sets in and form degrades, the AI may stop counting, which is appropriate.
Questions? Answered.
How does the AI know I squatted deep enough?
REPS tracks the position of your hip crease relative to your knee. When your hip crease passes below the top of your knee, the AI registers sufficient depth. This is based on the standard "parallel or below" squat standard.
Does it count jump squats?
Standard bodyweight squats are most reliably counted. Jump squats may count if the landing position and subsequent squat meet the form threshold, but the explosive movement pattern can affect accuracy.
Why isn't REPS counting my squats?
Most common reasons: insufficient depth (hip crease above knee), camera can't see your full body, poor lighting, or camera angle doesn't capture the hip-knee relationship well. Try a side angle in a well-lit room.
Can I wear pants/shorts and have it work?
Yes. The AI tracks skeletal keypoints, not your actual skin. It detects body position through clothing. Very loose, flowing clothing might slightly affect accuracy but normal workout clothes are fine.
What about sumo squats or narrow squats?
REPS is optimized for standard bodyweight squats. Wide-stance or narrow-stance variations may count if they meet the depth threshold, but accuracy may vary with non-standard stances.
How does the squat counter app work?
The squat counter app REPS uses computer vision AI running on your iPhone to count exercise reps automatically through your phone's camera. During your workout, REPS maps your body's skeleton by tracking key joints and angles as you move. When you complete a full repetition of exercises like pushups or squats, the AI detects the proper movement pattern and range of motion, then logs the rep instantly with no buttons to press. REPS validates that you hit required positions before counting — pushups need chest-to-ground depth and full arm extension, squats require hip crease below knee level. The computer vision technology runs entirely on-device during workout sessions. Supported exercises include pushups, squats, burpees, lunges, jumping jacks, high knees, and mountain climbers. Each counted rep awards 1 XP toward rank progression. The automatic counting removes manual tracking burden, letting you focus on exercise execution and form during training sessions.
Every squat counted. AI verifies your depth.
Free on iOS. No equipment needed. AI counts every rep.
