Lean · 薄肌 vs REBL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lean · 薄肌
This app is an AI-powered strength training journal that tracks your workouts, provides post-session coaching, and visualizes your progress. It offers built-in programs, custom plan creation, and AI-assisted planning based on your goals and equipment.
- AI-assisted workout planning
- Voice and text workout logging
- Post-workout AI debriefs
- Set-by-set logging with PR detection
- Apple Watch standalone app
- HealthKit integration
- 3D muscle heatmap visualization
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Lean, formerly LumaFit, brings strength training, hydration and sleep into one daily routine. TRAIN AND SEE YOUR PROGRESS • Follow built-in routines or create multi-day plans. • Record sets, reps, weight, RPE, cardio and workout notes. • Review personal records, training history, muscle coverage and progress trends. • Use Apple Watch, Live Activities and widgets, with optional iCloud sync. MAKE CONSISTENCY VISIBLE • Track training, water and sleep from the daily dashboard. • Optionally import sleep records from Apple Health after granting permission. • Reveal silver-blue metallic workout reports, review your best sets and share your progress. • Choose whether to include body measurements or hide absolute training weights in shared reports. CAMERA EXAMS AND ACHIEVEMENTS • Try pull-up exams and push-up counting with on-device pose recognition and live landmarks. • Switch between front and rear cameras in the camera screen. • Unlock playful fitness degree achievements, revisit them on the achievement wall, and share landscape certificates or portrait posters. • Camera video for movement recognition is processed on-device and is not recorded or uploaded. Pose counting depends on lighting, camera placement and visibility. In-app fitness degrees are entertainment achievements, not academic degrees or professional certifications. OPTIONAL AI COACHING • Ask training questions or generate editable plans and workout reviews. • Estimate meals from photos or descriptions, then review and confirm before saving. • Two free AI text chats are available each day. Additional AI features require LumaFIT Pro. • Online AI requires an internet connection and consent before relevant data is sent to the disclosed service. LUMAFIT PRO Monthly and yearly auto-renewable subscriptions are available through Apple. Any eligible introductory offer and renewal price are shown before purchase. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. Manage or cancel in your App Store account settings and restore purchases in the app. A LumaFit account is optional. Fitness guidance and meal estimates are for general reference, not medical advice. Stop exercising if you feel pain or unwell. Privacy Policy: https://lumafit.xyz/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
REBL
This app acts as an AI-powered strength coach, providing personalized workout guidance and readiness scores. It offers offline suggestions for weight and reps, tracks workout intensity, and helps users understand their training progress without requiring an internet connection or account.
- Offline AI workout suggestions
- Readiness score and widget
- Workout intensity tracking
- Apple Watch app integration
- Apple Health integration
- Exercise library
- AI-driven adaptive programs
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REBL logs your training and suggests your next weights and reps with an engine that runs free, offline, on your phone. On top of that: an AI coach that writes your program around your sport and your goals. THE ENGINE — FREE, OFFLINE Sport or no sport, this is the core of REBL. • Log sets in seconds, mid-workout. • REBL suggests your next weights and reps from your training history. No account, no connection, no guesswork. MADE FOR iPHONE DUO — NEW IN 2.2 • Open it: your workout queue on the left, the lift you're on to the right. Log a set, rest, move on — the next exercise is already there. • Fold it mid-set and keep going on the outer display. The rest timer comes with you. • Your Duo's finish, in the app: Night Sky when you're in dark, Star White in light. Settings > Finish if you'd rather have plain black or white. • On every other iPhone, nothing moves. KNOW WHERE YOU STAND • Readiness score, computed from your own training — know how recovered you are before you lift. No wearable needed; connect Apple Health and it reads your sleep, heart rate variability and resting heart rate too. • Home-screen widget puts readiness at a glance. • Session intensity score when you finish a workout. TRAIN FOR YOUR SPORT — FREE • Pick your sport, or type your own — BJJ, cycling, soccer, pickleball, a marathon in the fall. • The AI generates a program shaped by your sport's demands. Free. • Put game and practice days on your schedule. • Game-day protection, built into the engine: key lifts take on no new weight within two days of a game, while reps keep moving. You walk in fresh and still make progress. • Season memory: REBL remembers your season and gives you a heads-up before the next one starts. • If your sport races, REBL says race day. If it fights, match day. The app speaks your language. TRAIN TOWARD A DATE • Set a meet, race, or tournament date. Free: the countdown and where you stand — build window, sharpening, race week. • With Pro, the coach builds your plan toward that date and writes your race-week taper. REBL PRO — AI COACHING • Weekly insights drawn from how you actually trained, not how you planned to. • An adaptive program: the coach writes your training blocks and revises them as your training changes. • Query Coach: ask anything about your training and get an answer grounded in your history. • Form cues on your lifts. • The goal-date plan and race-week taper, authored for you. BUILT FOR LIFTERS • Plate calculator, PR tracking, full stats. • 600+ exercise library. • Bodyweight and waist, tracked side by side in your profile. • Apple Watch app — log from your wrist. • Apple Health: connect your sleep, heart rate variability and resting heart rate to sharpen your daily readiness score. They're analyzed on your iPhone. REBL also saves your workouts to Health. YOUR DATA STAYS YOURS • Your workouts live on your device, synced privately with iCloud. AI coaching sends your training data to our AI provider only after you say yes. • No accounts. No ads. No tracking. PRO SUBSCRIPTION REBL Pro is $7.99/month or $39.99/year after a 14-day free trial. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms of use and privacy policy are available in the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://bgale06.github.io/trainer-privacy/
Screenshots
Verdict
The clearest difference is review sentiment: REBL at 100% against Lean · 薄肌's 0%. REBL also leads on update cadence (every 5 days vs every 3 weeks). Lean · 薄肌's advantage is iOS requirement (18.0 vs 26.0). On price, ads, in-app purchases and monetization model 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. Lean · 薄肌 sells 2 in-app purchases, starting at $8.99 per month and REBL sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Lean · 薄肌 ships an update every 3 weeks, REBL every 5 days. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.
| Parameter | Lean · 薄肌 | REBL |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (9 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 9 — better |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 37 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | 海圆 马 | Galeworks, LLC |
Customer experience
Lean · 薄肌
REBL
In-app purchases
Lean · 薄肌
- LumaFit Pro Monthly$8.991 Month
- LumaFit Pro Yearly1 Year trial$59.991 Year
REBL
- trAIner Pro (Monthly)14 Days trial$7.991 Month
- trAIner Pro (Annual)14 Days trial$39.991 Year








