Comparison

Tetsuo vs OneCrunches

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tetsuo

Automatically counts your reps for exercises like squats, push-ups, and pull-ups using your phone's camera. It records each set, stitches the footage into a shareable timelapse, and offers built-in and customizable challenges for accountability.

Highlights
  • Automatic rep counting via camera
  • On-device motion tracking
  • Video recording of each set
  • Shareable timelapse creation
  • Built-in and custom challenges
  • Face blurring for privacy
  • No account required
Features
Read full description

TETSUO is a workout tracker that watches you train. Prop up your phone, hit Start Workout, and go — the camera recognizes what exercise you're doing, counts every rep out loud, times your rest between sets, and grades your training over time. No wearables, no tapping between sets, no manual logging. ONE BUTTON. THAT'S IT. There's no exercise picker and no setup flow. Start a workout, walk in front of the camera, and start moving. TETSUO detects the exercise from your body's motion, and by the time it announces your set, the reps you already did are counted — it was watching from the first rep. When you stop, the set saves itself and a big rest timer takes over, readable from across the room. WHAT IT COUNTS • Squats • Push-ups • Pull-ups • Sit-ups • Hanging leg raises • Plank — held seconds, timed automatically Rep detection runs on real body geometry — joint angles, not guesswork — so cheat reps, walk-bys, and warm-up shuffling don't count. Audio cues confirm every rep so you never have to look at the screen. Finish a set hands-free: just walk away, drop off the bar, or cross your wrists overhead. EARN YOUR RANK Every workout is scored, and your recent training rolls up into a letter rank — from F all the way to S+. Reps are bucketed into muscle groups (push, pull, legs, abs), a quality day means really working a group, and rest days are built into the system — because recovery is training too. Your rank reflects what you've done lately, not what you did last year. YOUR TRAINING, VISIBLE The home screen is a day-by-day timeline of your training — every workout graded, every rest day honest. The Stats screen adds lifetime totals, per-exercise charts, records, and a training calendar. HIGHLIGHT CLIPS TETSUO keeps a short rolling buffer in memory while you train and offers up to three 4–6 second highlight clips of your best reps after each workout. Save the ones you like to Photos, share them, or dismiss them — nothing is kept unless you say so. PRIVATE BY DESIGN Everything runs on your iPhone. Pose detection is fully on-device, no video is ever recorded to disk during your workout, and your workout history never leaves your phone. The camera is a sensor, not a surveillance system. SMART ABOUT THE REAL WORLD • Pick up your phone mid-workout? TETSUO pauses and quietly re-arms when you set it back down. • Step out of frame for a set? The summary flags the gap so you can log it honestly. • Rest as long as you need — an optional rest target gives you a single soft ping. • The screen stays awake for the whole session. No subscriptions required to count reps. No account. No wearable. Just you, your phone, and the work. Privacy: https://www.tem.dev/d100-privacy-policy.pdf Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OneCrunches

This app provides a focused and reliable way to track your crunch workouts. It offers features like goal setting, streak building, detailed stats, and challenges to help you stay consistent with your core routine. Easily log crunches with quick controls and access your progress via widgets and Apple Watch.

Highlights
  • Fast crunch counting with responsive controls
  • Goals and progress tracking
  • Streaks, records, and achievements
  • Editable crunch log
  • Detailed stats and history
  • Challenges for accountability
  • Apple Watch app and complications
Features
Read full description

TRACK EVERY CRUNCH. BUILD REAL MOMENTUM. OneCrunches is a focused crunch counter built for people who want fast, reliable workout tracking without friction. Tap to count, stay locked in, and watch your progress grow with goals, streaks, stats, achievements, reminders, widgets, themes, and challenges — on iPhone, iPad, and Apple Watch. Whether you are doing a quick ab session or building a long-term core routine, OneCrunches keeps the workout simple while giving you powerful tools to stay consistent. NEW IN 3.0 - An Apple Watch app with watch face complications - Challenges: create or join a challenge and see how others are doing - Edit or backfill any day in your crunch log - Keep Screen Awake while counting - A Control Center button and Siri support to log crunches instantly - Better iPad layouts, improved VoiceOver support, and more languages FEATURES - FAST CRUNCH COUNTING Tap to log every crunch with responsive controls designed for real workouts - QUICK ADD AND GESTURE CONTROLS Use tap, drag, and quick add to count the way that feels best during your session - KEEP SCREEN AWAKE Prop up your phone and keep counting between sets without the screen going dark - CLEAN, FOCUSED DESIGN A distraction-free interface keeps your attention on your workout - GOALS AND PROGRESS TRACKING Set daily, weekly, monthly, and custom goals with clear visual progress - STREAKS, RECORDS, AND ACHIEVEMENTS Stay motivated with streak tracking, personal bests, milestone celebrations, and unlockable achievements - EDITABLE CRUNCH LOG Missed logging a workout? Add or correct any past day, and your stats and streak update automatically - DETAILED STATS AND HISTORY Review your crunch history with charts, averages, trends, active days, and performance insights - SHAREABLE STATS Share your progress summary with friends or on social media - SMART REMINDERS AND WEEKLY SUMMARIES Stay consistent with flexible reminders and weekly progress updates - CHALLENGES Create and join public challenges to stay accountable, see how others are doing, and keep your streak going. Pick a per-day target or a total goal, choose a duration, and you're in. Report and block tools help keep Challenges friendly. - APPLE WATCH APP Count from your wrist, and keep your daily progress on your watch face with complications - WIDGETS, CONTROL CENTER, AND SIRI Track progress at a glance and add crunches from your Home Screen, Lock Screen, Control Center, or with Siri - PERSONALIZED THEMES Customize the counter with visual themes that make training more fun and rewarding - ICLOUD SYNC Keep your crunch history, goals, and stats in sync across your devices - OPTIONAL UPGRADES Remove ads and unlock premium themes for an even better experience WHY ONECRUNCHES? Most fitness apps try to do too much while you are working out. OneCrunches is built to do one thing extremely well: help you count crunches quickly, accurately, and consistently. You stay in control of every rep. No guessing. No clutter. Just a simple tool that helps you build momentum over time. Download OneCrunches and turn every crunch into measurable progress.

Screenshots

Tetsuo3 screens
OneCrunches4 screens

Verdict

The call

The clearest difference is rating: OneCrunches at 5.0 against Tetsuo's 3.0. OneCrunches also leads on device support (3 vs 1). Tetsuo's advantage is ads (none vs shown) and update cadence (every 3 days vs weekly). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Tetsuo sells 2 in-app purchases, starting at $2.99 per month and OneCrunches sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

OneCrunches holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Tetsuo ships an update every 3 days, OneCrunches weekly. Both last shipped on November 5, 2026.

Scorecard4 real differences · 6 level
Tetsuo versus OneCrunches: the parameters behind the verdict, then further details
ParameterTetsuoOneCrunches
PriceFreeFree
Rating3.0 (2 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings22
Update frequencyEvery 3 days — betterWeekly
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone, iPad, Apple Watch — better
Requires iOS18.017.6 — better
Further details — not scored
Size53 MB15 MB
Age rating4+12+
DeveloperTem AbJared Ewing

Customer experience

Tetsuo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OneCrunches

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Tetsuo

Subscriptions2
  • DAY100 Plus1 Month trial$2.991 Month
  • DAY100 Plus1 Month trial$17.991 Year
4 purchases

OneCrunches

One-time4
  • Theme Pack$1.99
  • Remove Ads$2.99
  • Premium Themes$4.99
Show 1 more
  • Unlock Everything$6.99

Questions

Is Tetsuo free?
Tetsuo is free to download, with in-app purchases available.
Is OneCrunches free?
OneCrunches is free to download, with in-app purchases available.
Which has better reviews, Tetsuo or OneCrunches?
OneCrunches is rated higher. Tetsuo averages 3.0 out of 5 from 2 ratings, while OneCrunches averages 5.0 from 2 ratings.
Do Tetsuo or OneCrunches have ads?
OneCrunches shows ads; Tetsuo does not.
Which is updated more often, Tetsuo or OneCrunches?
Tetsuo ships an update every 3 days, and OneCrunches weekly. Most recently, Tetsuo was updated on November 5, 2026 and OneCrunches on November 5, 2026.

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