Rep counter app for push-ups and squats
A rep counter app should save you from counting in your head. The question is how it counts, because the method decides whether you can trust the number. Proof90 counts push-ups and squats with your phone's camera, and labels everything it can't measure.
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The three ways an app can count reps
Camera pose detection. The phone watches your joints and counts a rep when you move through your range and back. It works hands-free, needs nothing on your body, and can tell a real rep from a half-rep. It needs to see you, so it needs a little space and light. This is what Proof90 does.
Proximity or motion sensors. You put the phone on the floor or hold it, and a sensor fires as you get close or move. It's simple and works in the dark, but it counts movement near the sensor, not a rep, so it is easy to over- or under-count.
Manual counting. You tap a button or type in the number. It's accurate only to the extent you are, which is the "tick-box" problem every habit app has.
What Proof90's counter checks
For squats it follows the angle at your knee (hips, knees and ankles in view); for push-ups the angle at your elbow (shoulders, elbows and wrists in view). For both it:
- waits until your whole body is in frame before it starts counting
- measures joint angles rather than screen position, so distance from the phone matters less
- sets your top and bottom from your first three reps, then judges every rep against your own range
- needs the movement to go through the bottom and back up, so a wobble doesn't add reps
- tells you plainly if it can't follow you, instead of quietly miscounting
What it can't do
It isn't a coach and it doesn't judge your form beyond range of motion. It doesn't count exercises it hasn't been built for. When the camera can't count a set, you can log it on your word and it is recorded as exactly that. See how verification works.
Set your phone up
Prop the phone side-on, a few steps back, with your whole body in frame and good light. Wait for the "I can see you" signal and start. The push-up counter guide has the setup in more detail, and the squat counter guide has a 60-second checklist and a table of miscount causes and fixes.
From counting to a challenge
A counter tells you how many. A challenge tells you whether you kept showing up. Proof90's 90-day challenge builds the push-ups and squats up over 13 weeks, adds a daily walk measured by your phone's sensors, and keeps a streak that can't be rewritten.
Questions
What is the best way to choose a rep counter app?
Ask how it counts, whether it works offline, whether it records video, and whether it tells you when it isn't sure. An app that never admits a miss is guessing.
Does Proof90 work for other exercises?
Today it counts push-ups and squats by camera, measures walks with your phone's motion sensors, and treats anything else (food, sleep) as honor-system and labels it that way.
Does it use AI?
It uses on-device machine-learning pose detection to find your joints. The counting rules that turn those joints into reps are ordinary logic that we test against recorded movement, so a given set counts the same way every time.
Is my video uploaded?
No. Frames are processed on the phone and discarded.