RepZero is a weight lifting log and gym workout tracker for iPhone and Apple Watch.
Log every set in seconds, see your records the moment you break them, and always know what to train next. It's built for people who want to know they're getting stronger, not just hope they are.
LOGGING THAT KEEPS UP WITH YOU
RepZero shows one set at a time: tap your weight and reps, log it, and the rest timer starts on its own. Supersets, drop sets, timed holds and cardio all work the way you'd expect.
• Plate calculator: which plates go on each side of a barbell, trap bar, EZ bar or Smith machine
• Warm-ups in one tap, ramping up to your first working set
• Rest timer on your Lock Screen and in the Dynamic Island, with skip and log buttons
• New personal records show up live, mid-workout
• Start a workout from a widget, Control Center, Siri or Shortcuts
BUILT FOR APPLE WATCH
Leave your phone in your bag. Start a workout on your wrist, turn the Digital Crown to set weight and reps, and double tap to log. Heart rate and calories go to Apple Health, and everything syncs back to your iPhone.
PROGRAMS THAT MOVE YOU FORWARD
Follow a program and RepZero plans every session and raises your weights as you progress. Beginner Strength and Dumbbell Foundations are free. Upper/Lower Hypertrophy, Push/Pull/Legs, Strength Waves and Minimalist come with Pro, and so does building your own program from your routines.
AN AI COACH IN YOUR POCKET
Ask the AI coach about your training, from what to train today to building a new routine. It runs on device with Apple Intelligence on supported iPhones.
SEE YOUR PROGRESS, CLEARLY
• Estimated 1RM, PRs and records for every lift
• Volume, workout and training-time trends
• A weekly goal with streaks that give you credit for rest days
• Muscle recovery at a glance
• A full history of every workout, as a list or a calendar
• Achievements that reward consistency
START STRONG, STAY ORGANIZED
Use a ready-made routine or build your own in minutes, and share routines and programs with a link. Bring your history from other apps with an AI-assisted import. Back up to iCloud, sync across devices with a free account, and export your data anytime.
REPZERO PRO
Pro is for lifters who want a plan, not just a log.
• Coach: ranked next steps after every workout, like adding sets to a lagging muscle or breaking through a plateau, applied to your routines in one tap
• Recovery check: reads last night's sleep, heart rate variability and resting heart rate from Apple Health and suggests going lighter or taking a rest day. Those readings never leave your device.
• All six programs, plus programs you build yourself
• Lift forecasts, strength levels and muscle balance
• Unlimited custom routines (free includes 5)
• Body measurements, Lift and Progress widgets, and premium themes
• The Gainz Goblin: a pixel-art pet on your Today screen, Watch and Live Activity. Train and he stays fed. Skip too many days and he gets hungry.
WHOEVER YOU ARE
Chasing your first bodyweight bench, running a powerlifting block or just trying to get to the gym three times a week, RepZero shows you it's working and what to do next.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://darkmatterlabs.app/privacy
This app is easy to use, and helps to keep me accountable to maintain and increase my gainzzzz. Whoever invented this is a genius and probably a super awesome person.
Developer Response
Thanks!
RepZero 2.4 turns every workout into a goblin fight, adds how-to guides for barbell and dumbbell exercises, and fixes some bugs.
NEW
- Goblin fights (Pro): every workout is a fight with your Gainz Goblin. Each set you log lands a hit and your last working set knocks it out, in the set logger, the Live Activity and on Apple Watch
- Exercise guides: barbell and dumbbell exercises have a how-to with an illustration of each step, form cues, common mistakes and an animated figure. Open one from the exercise page, the Form button while you log, or the exercise picker
IMPROVED
- Log Set now sits in the bottom bar next to − Set and + Set, with Done at the top
- Stretching and mobility workouts count toward Mobility Master, Mobility Guru and Recovery Master, and Hulk Smash Mode is now a reachable 1,300 lb total
- With App Lock on, widgets hide your data on a locked iPhone, and Siri asks you to unlock before reading your stats or logging your weight
- Muscle and equipment names are translated correctly in every language
FIXED
- A note, weight or other value you clear no longer comes back after a sync
- Changes made on another device while a sync runs are no longer missed
- Drop sets and back-to-back workouts from Apple Watch reach your iPhone intact
- A workout ended for being idle is saved at the time you stopped training
- If a workout can't be saved, RepZero tells you, and finishing again won't save it twice
- Programs count a successful AMRAP set even when an earlier set wasn't logged
- iCloud backup keeps your backup safe after the app's data is reset
Version 2.4.0
Subscriptions
RepZero Pro Yearly
Programs, Recovery check, Goblin & themes
Free Trial
RepZero Pro Monthly
Programs, Recovery check, Goblin & themes
Free Trial
The developer, Dark Matter AI Labs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Health & Fitness
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
VoiceOver
Larger Text
Dark Interface
Differentiate Without Color Alone
Sufficient Contrast
Information
Seller
Dark Matter AI Labs LLC
Size
155.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.