Comparison

Muscle Booster Workout Tracker vs Caliber

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

Head to head
About

Muscle Booster Workout Tracker

This app acts as a personal trainer, creating customized workout plans for muscle gain, weight loss, or recovery. It offers a vast library of exercises and challenges for home or gym, adapting to your available equipment and goals.

Highlights
  • Personalized workout plans
  • 1000+ exercise library
  • Home and gym workouts
  • Calisthenics and weight loss plans
  • Workout timer and audio tips
  • Equipment-based plan creation
  • Muscle recovery guidance
Features
Read full description

Take your fitness journey to the next level with Muscle Booster Workout Tracker, the ultimate Workout Planner that integrates with your Apple Watch. Train anywhere, anytime with a complete gym & exercise app designed to help you get fit. What are you waiting for? MUSCLE BOOSTER WILL HELP YOU TO: Build muscle, sync with Apple Health, and boost your fitness schedule from home! With an integrated calorie tracker, body editor plan, and step-by-step gym workouts, you can stay motivated, get your belly flat, monitor your health, and achieve your fitness goals anywhere. Anywhere, Anytime! Whether you prefer home workouts, calisthenics, core, or weight loss, Muscle Booster provides personalized training plans for all levels. Work with your own digital coach and follow structured gym routines inspired by popular fitness and gym pros. Track your strength gains, body measurements, and fat loss with smart analytics and stay consistent in building a strong exercise routine and a healthy body. Explore hundreds of exercises and plans. Workout tracker, AI calorie tracker, and weight loss Strength training, HIIT, core, weightlifting, bodyweight calisthenics. Abs and belly training. Enjoy personalized sessions tailored to your fitness level. Build muscle, burn fat, and maintain overall health. Use the workout planner to schedule sessions and combine gym routines. Track your performance and measure your progress over time on Apple Health. Personalize your home workouts Workouts, calories burned, and heart rate in real-time. Customize your home workout sessions or gym routines with guided workouts, a training planner, anytime fitness, and exercises targeting your core, arms, legs, and full body. Whether your goal is to lift, get fit, or simply stay active, Muscle Booster keeps your activity high with interactive videos, progress tracking, and social features to connect with friends and fitness hotschedules. Customize your exercise routines on the go Join the community of weightlifting enthusiasts and get inspired by training programs from pros, and more. Train at home, in the gym, or on the go, with the flexibility to adapt exercise routines anytime. Track your progress with smart analytics, manage your diet, and see real-time results with Apple Watch integration. Whether you are following a body coach plan, a workout app program, or creating your own custom gym routines, Muscle Booster makes it easy to stay consistent and achieve your objectives. Designed for all fitness stages Muscle Booster Home Workout combines the best of home workouts, sports training, calisthenics, strength training, and guided video exercises into a single exercise app. With personalized workout plans, motivational tools, and a comprehensive tracker, you can lose fat, get stronger, and transform your body efficiently. Perfect for all levels, from beginners to advanced athletes, the app ensures your training is smart, effective, and fun. Follow your progress, stay inspired Take control of your health and training today. Use Muscle Booster for gym workout, home workouts, core, running, and all your sports needs. Track your progress, stay motivated, and become the strongest, healthiest version of yourself. With a full workout planner, personal coach features, and integration with your device, your goals are within reach. SUBSCRIPTION INFO: Download the app at no initial cost. Further use requires a subscription. A trial may be offered as indicated in the app. Subscription prices are shown in the app and charged to your Apple ID upon purchase confirmation. Subscriptions renew automatically unless auto-renewal is turned off at least 24 hours before the current period ends. Renewal charges occur within 24 hours before the current period expires. Terms of Use: https://legal.muscle-booster.io/page/terms-of-use Privacy Notice: https://legal.muscle-booster.io/page/privacy-policy

About

Caliber

This app offers science-based strength training, including workout planning, tracking, and exercise tutorials. It supports individual training, group workouts, and offers optional upgrades for personalized plans, advanced features, and one-on-one coaching.

Highlights
  • Unlimited workout creation and tracking
  • 600+ exercise tutorials with videos
  • Workout groups for training with friends
  • Coach-designed training plans
  • Personalized progress tracking
  • 1-on-1 elite coaching options
Features
Read full description

Caliber is a science-based strength training app that combines resistance training, cardio, nutrition, and habit formation to help you build muscle, lose weight, and improve your overall fitness - for good. TRAIN YOUR WAY • Free Version. Create and track unlimited workouts, access 800+ exercises, and train solo or with friends. • Caliber Plus. Maximize your results with coach-designed training plans, personalized progress tracking, nutrition targets and more. • Premium Coaching. Get 1-on-1 guidance from an elite-level personal trainer with a fully customized training and nutrition plan, in-app chat + video messaging with your coach and weekly progress reviews to keep you on track. CALIBER FEATURES (FREE VERSION) • Personalized Workouts. Create and track an unlimited number of workouts tailored to your goals. No gym required. • Detailed Exercise Tutorials. Learn proper form with step-by-step videos and pro tips from Caliber coaches. • Workout Circles. Train with friends and family in private workout chats. When you hit a personal best, it's shared with the group. • Apple Health Integration. Sync your cardio, nutrition, steps and body stats from your wearable or connected device. • Connect to AI. Sync your training data with ChatGPT and Claude for personalized insights and training analysis. UNLOCK MORE WITH CALIBER PLUS (OPTIONAL UPGRADE) • Coach-Designed Training Plans. Choose from 120+ structured plans tailored to your goals, experience level and schedule. • Strength Score. Measure how strong you are relative to your potential for your age and gender. • Strength Balance. Improve your posture and mobility by optimizing your training across key muscle groups. • Caliber Lessons. Gain expert insights on training and nutrition to accelerate your progress. • Advanced Training Features. Get personalized nutrition targets, create custom exercises and supersets, swap exercises, upload progress photos, and more. PREMIUM COACHING (OPTIONAL UPGRADE) • Work with an Elite-Level Coach. Train 1-on-1 with a dedicated coach to achieve your full potential in the gym and beyond. Caliber coaches are highly vetted, accredited personal trainers among the top 1% in their field. • Fully Personalized Plan. Your coach will design a training and nutrition program just for you based on your goals, experience and lifestyle. • Daily Motivation & Expert Guidance. Stay on track with in-app messaging, video form reviews, and individualized guidance. • Weekly Progress Reviews. Get in-depth analysis from your coach to optimize your training. • Fast Response Times. Your coach is available 24/7, typically replying within a few hours. • Guaranteed Results. On average, Caliber members improve their body composition by 20% or more within 12 weeks. If you don't see results, we'll refund the cost of the program. SEE WHAT OUR MEMBERS SAY • For detailed reviews from real Caliber members, visit our TrustPilot page at https://www.trustpilot.com/review/caliberstrong.com Terms of Use: https://caliberstrong.com/terms-of-service/ Privacy Policy: https://caliberstrong.com/privacy-policy/

Screenshots

Muscle Booster Workout Tracker4 screens
Caliber4 screens

Verdict

The call

The clearest difference is review sentiment: Caliber at 78% against Muscle Booster Workout Tracker's 44%. Caliber also leads on rating (4.8 vs 4.5) and iOS requirement (15.1 vs 17.0). Muscle Booster Workout Tracker's advantage is ratings volume (139K vs 6.1K) and chart position (#69 vs unranked). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Muscle Booster Workout Tracker sells 16 in-app purchases, starting at $9.99 per 7 days and Caliber sells 18 in-app purchases, starting at $3.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Caliber holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Muscle Booster Workout Tracker has 139K ratings behind it against 6.1K, so its average is the more settled of the two. Written reviews point the same way: 44% of Muscle Booster Workout Tracker's written reviews are positive against 78% of Caliber's.

UpkeepUpdate frequency

Muscle Booster Workout Tracker ships an update every 9 days, Caliber fortnightly. Both last shipped on November 1, 2026.

Scorecard5 real differences · 6 level
Muscle Booster Workout Tracker versus Caliber: the parameters behind the verdict, then further details
ParameterMuscle Booster Workout TrackerCaliber
PriceFreeFree
Rating4.5 (139K ratings)4.8 (6.1K ratings) — better
Positive reviews44.0% of reviews78.1% of reviews — better
Number of ratings139K — better6.1K
Update frequencyEvery 9 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#69 — better—
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size575 MB59 MB
Age rating17+12+
DeveloperWELLTECH APPS LIMITEDCaliber Fitness, Inc

Customer experience

Muscle Booster Workout Tracker

All ratings138,667 ratings
Positive89.4%
Neutral3.6%
Negative7.0%
Written reviews2,942 reviews
Positive44.0%
Neutral8.0%
Negative48.0%

Caliber

All ratings6,057 ratings
Positive96.6%
Neutral1.1%
Negative2.3%
Written reviews529 reviews
Positive78.1%
Neutral6.2%
Negative15.7%

User reviews

Muscle Booster Workout Tracker

From 139K App Store ratings

What we love

  • 🚀 Great workouts
  • 👍 Easy to follow
  • 👍 Variety of exercises
  • 🚀 Customizable plans
  • 👍 Helpful for beginners

Room to improve

  • 🐛 Buggy app performance
  • 🔒 Lack of free trial
  • 💰 Expensive subscription
  • 👎 Limited gym equipment options
  • 👎 Repetitive exercises

Caliber

From 6.1K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Comprehensive workout tracking
  • 💡 Customizable workouts
  • 🔍 Detailed exercise instructions and videos
  • 📊 Strength score and progress tracking

Room to improve

  • 🐛 Occasional app crashes and bugs
  • 🔍 Limited offline functionality
  • 💰 Subscription model can be confusing
  • 🔍 Inconsistent video quality and exercise explanations
  • 🕰️ Frustrating user interface at times

Bugs and requests

Muscle Booster Workout Tracker

Reported bugs

5 issues
  • Workouts not logging properly
  • App freezing and crashing
  • Sync issues with Apple Watch
  • Inaccurate exercise counting
  • Inability to contact customer support

Requested features

5 requests
  • Ability to track progress and weights
  • Better integration with Apple Health
  • More personalized meal plans
  • Ability to customize workout schedules
  • Audio/voice guidance during workouts

Caliber

Reported bugs

3 issues
  • Workout data loss when switching between online and offline mode
  • Strength score not updating correctly in some cases
  • Inability to log weight for certain exercises

Requested features

5 requests
  • Add ability to create and save custom exercises
  • Integrate with more fitness tracking devices and apps
  • Improve offline mode to allow full workout tracking
  • Provide more flexibility in workout scheduling and planning
  • Enhance strength score calculations and explanations

In-app purchases

16 purchases

Muscle Booster Workout Tracker

Subscriptions15
  • 1 Week Subscription7 Days trial$9.997 Days
  • 1 Week Subscription$9.997 Days
  • 1 Week Subscription7 Days trial$14.997 Days
Show 12 more
  • 1 Month Premium$14.991 Month
  • Muscle Booster$14.991 Month
  • Muscle Booster Workout Premium3 variants$19.991 Month
  • 1 Month Subscription$19.991 Month
  • 1 Month 22.99 with 7-day free trial7 Days trial$22.991 Month
  • 1 Month Subscription$24.991 Month
  • 3 Month Subscription3 variants$29.993 Months
  • 3 Month Premium6 Months trial$39.993 Months
  • 3 Months Subscription6 Months trial$39.993 Months
  • 1 Year Premium2 variants$59.991 Year
  • Muscle Booster Premium$59.991 Year
  • 12 Month Subscription$79.991 Year
One-time1
  • Premium Bundle$29.99
18 purchases

Caliber

Subscriptions18
  • Caliber Supporter (Monthly)$3.001 Month
  • Caliber Supporter (Monthly)$5.001 Month
  • Caliber Plus (Monthly)2 variants$6.001 Month
Show 15 more
  • Caliber Plus (Monthly)7 Days trial$6.001 Month
  • Caliber Supporter (Monthly)$7.001 Month
  • Caliber Supporter (Monthly)$9.001 Month
  • Caliber Plus (Monthly)2 variants$9.001 Month
  • Caliber Plus (Monthly)2 variants$12.001 Month
  • Caliber Pro (Monthly)$19.001 Month
  • Caliber Pro (Monthly)7 Days trial$19.001 Month
  • Caliber Plus (Yearly)7 Days trial$36.001 Year
  • Caliber Pro (3 Months)$49.003 Months
  • Caliber Pro (3 Months)7 Days trial$49.003 Months
  • Caliber Plus (Yearly)7 Days trial2 variants$54.001 Year
  • Caliber Plus (Yearly)7 Days trial2 variants$72.001 Year
  • Caliber Plus (Yearly)1 Month trial$72.001 Year
  • Caliber Pro (Yearly)$169.001 Year
  • Caliber Pro (Yearly)7 Days trial$169.001 Year

Questions

Is Muscle Booster Workout Tracker free?
Muscle Booster Workout Tracker is free to download, with in-app purchases available.
Is Caliber free?
Caliber is free to download, with in-app purchases available.
Which has better reviews, Muscle Booster Workout Tracker or Caliber?
Caliber is rated higher. Muscle Booster Workout Tracker averages 4.5 out of 5 from 139K ratings, while Caliber averages 4.8 from 6.1K ratings.
Do Muscle Booster Workout Tracker or Caliber have ads?
Neither Muscle Booster Workout Tracker nor Caliber shows ads.
Which is updated more often, Muscle Booster Workout Tracker or Caliber?
Muscle Booster Workout Tracker ships an update every 9 days, and Caliber fortnightly. Most recently, Muscle Booster Workout Tracker was updated on November 1, 2026 and Caliber on November 1, 2026.

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