RepZero vs Trunk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RepZero
This app helps you track your weightlifting progress with detailed logging and an AI coach. It provides insights into your performance, personal records, and recovery, all while syncing seamlessly with Apple Watch and Health.
- Detailed set logging with rest timers
- Plate calculator for barbells
- Apple Watch integration for wrist tracking
- AI coach for training advice
- Progress visualization and personal records
- Customizable workout programs
- Muscle recovery insights
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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
Trunk
This app helps you track your gym workouts and progress with an intuitive interface. It offers AI integration for personalized training plans and detailed analytics, all without any subscriptions.
- Workout logging
- AI training plan integration
- Progress visualization
- Rest timer with notifications
- Offline functionality
- Customizable workout organization
- Unlimited profiles and sessions
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Trunk helps you log your lifting and review your progress. TRACK YOUR LIFTS Record sets, reps and weight. Organize your training with profiles, sessions and exercises. SEE YOUR PROGRESS Review your workout history, compare exercise performance over time, and track progress toward your goals. KEEP YOUR WORKOUT MOVING Set custom rest timers and use Trunk's Lock Screen workout controls. CONNECT YOUR OWN AI Already use an AI assistant like ChatGPT or Claude? Link it with Trunk and import the programs it builds for you in two taps. Anything you share with your AI is between you and your AI provider. AI integration requires Trunk+ (in-app purchase). Questions or feedback? Use the support link on this product page.
Screenshots
Verdict
The clearest difference is ratings volume: RepZero at 3 against Trunk's 1. On price, rating, update cadence and ads 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
Both are free to download. RepZero sells 2 in-app purchases, starting at $1.99 per month and Trunk sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for RepZero against 5.0 for Trunk. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
RepZero ships an update every 10 days, Trunk every 2 weeks. Both last shipped on November 5, 2026.
| Parameter | RepZero | Trunk |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 10 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 26.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 154 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Dark Matter AI Labs LLC | Adventureland, Inc |
Customer experience
RepZero
Trunk
In-app purchases
RepZero
- RepZero Pro Monthly14 Days trial$1.991 Month
- RepZero Pro Yearly14 Days trial$19.991 Year
Trunk
- Trunk+$9.99









