MUSCLER vs FitBoost
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MUSCLER
Log your workouts, build a personal fitness archive, and share your progress with friends. Participate in challenges and stay motivated by tracking your consistency and growth over time.
- Personal workout archive
- Log daily workouts with photos
- Monthly workout activity view
- Share progress with community
- Follow friends' journeys
- Join fitness challenges
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Build your personal workout archive and grow stronger together. MUSCLER is a fitness social app where every workout becomes part of your personal archive. Log your workouts, share your progress, and join fitness challenges with friends. Key features • Build a personal archive of your workouts • Log daily workouts with photos • View your monthly workout activity at a glance • Share your progress with the community • Follow and support your friends’ journeys • Join fitness challenges and achieve goals together Look back on how consistently you’ve worked out and see your progress build over time. Your daily efforts become a meaningful record that keeps you motivated. Archive your workouts, connect with friends, and stay motivated through challenges—all in MUSCLER. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
FitBoost
This app acts as a personal trainer, automatically adjusting your next set's weight and rest times based on your performance and effort. It integrates with smartwatches and offers detailed movement assessments, strength balance analysis, and customizable workout sharing.
- Automatic weight and rest adjustment
- Smartwatch integration (Apple Watch, Garmin)
- Strength and running tracking
- Camera-based movement assessment
- Customizable workout sharing
- Muscle recovery map and pain logging
- Strength balance analysis
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FitBoost is a training log for strength and cardio that turns your history into a concrete answer: how much to lift next. ■ A coach inside every workout Finish a set, log how hard it was, and your next set's weight is set for you. When fatigue starts costing you reps, it tells you to stop, and rest times adjust to how hard that last set was. The more you train, the more it learns your own stopping point and how you rate effort. ■ Apple Watch and Garmin Finish a set on your wrist and pick the effort. The rest timer starts, and a tap on your wrist says when it's time to go. 41 Garmin watch models log sets and rest from the wrist too. ■ Strength and running in one app Home opens with today's plan; Stats and Coach split into Strength, Running and Body. Track on phone or watch for splits, elevation and grade-adjusted pace. After a hard leg day, quality runs become easy runs. Repeat routes become courses to race your past self, shared by link, QR code or file. ■ Movement assessment Camera tests for mobility, fitness, jumps, bar speed and running form, with measurement error, change, left–right difference and sourced research ranges. Video stays on your device. ■ Share studio Design runs and lifts for Instagram stories: 26 layouts filled with this record; metric, word, pin and photo stickers; a font and color per label; stickers behind the person. Save to Photos, post to your story, or import GPX/TCX runs. ■ Free muscle recovery map and pain notes A body map shows how recovered each muscle is from recent training. On days you'd hit something still recovering, the home screen tells you first. Log pain and the lifts that use that muscle get lighter, with substitutes suggested. ■ Your routines go up on their own Start a routine and today's weights and reps come from your last sessions. Hit the top of your rep range and it goes up; miss it and it holds; miss twice and it eases off. Each kind of equipment uses its own step, and after a long break you come back gently. ■ Strength balance Compares your squat, bench press, deadlift, overhead press and barbell row against typical ratios. If one is lagging, it suggests an extra set or an accessory for your routine. ■ My gym and plate math Add your bar and the plates you own to see what goes on each side and in what order. Suggested weights snap to loads you can actually build, in kg or lb. ■ Your records are free and unlimited Workout records have no cap. No account needed, and your log stays on your device. iCloud keeps your iPhone and iPad in sync for free, and a backup file moves your log to another device. The free plan includes up to 3 routines and 5 custom exercises. ■ Train with your coach Pick a date range and send your trainer a workout report. Trainers keep each client's log separate from their own. ■ It works out your next load Completed sets of 12 reps or fewer feed Epley, Brzycki and Lombardi estimates, and we take the median. Log RIR and the reps you had left sharpen it further. ■ 1,600+ exercises, every one with a guide Every exercise carries setup, execution, breathing and precautions. Filter by muscle group and equipment to find what you need. ■ Five languages Korean, English, Japanese, Simplified Chinese and Traditional Chinese. FitBoost PRO adds auto progression, a personal 1–15 rep load curve, the in-workout coach, learned targets, strength balance fixes, plateau detection, gym-ready loads and a weekly report, with unlimited routines and custom exercises. For running: grade-adjusted pace, heart-rate drift, fitness and fatigue, critical speed, structured sessions, a race-day pacer and course segments. PRO+ adds a block-periodized program, daily intensity tuned to your readiness, weekly sets per muscle, nutrition targets and a weekly running plan that works around strength recovery. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://bbdyno.github.io/FitBoost-Site/privacy.html
Screenshots
Verdict
The clearest difference is update cadence: FitBoost at every 2 days against MUSCLER's every 4 days. FitBoost also leads on device support (4 vs 2). On price, review sentiment, ads 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
Both are free to download. MUSCLER sells 2 in-app purchases, starting at $1.99 per month and FitBoost sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
MUSCLER ships an update every 4 days, FitBoost every 2 days. The most recent releases landed on November 8, 2026 and November 6, 2026 respectively.
| Parameter | MUSCLER | FitBoost |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 days | Every 2 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 41 MB | 135 MB |
| Age rating | 12+ | 4+ |
| Developer | YEAWON BONG | Taein Kim |
Customer experience
MUSCLER
FitBoost
In-app purchases
MUSCLER
- MUSCLER Plus Monthly$1.991 Month
- MUSCLER Plus Annual$11.991 Year
FitBoost
- FitBoost PRO Monthly$2.991 Month
- FitBoost PRO+ Monthly$5.991 Month
- FitBoost PRO Annual$22.991 Year
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- FitBoost PRO+ Annual$39.991 Year









