# Muscle Booster Workout Tracker vs Caliber

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.

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.

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.

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

## The numbers

| Metric | Muscle Booster Workout Tracker | Caliber |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (139K ratings)](https://appshunter.io/ios/app/muscle-booster-workout-tracker/id1446447749/reviews) | **[4.8 (6.1K ratings)](https://appshunter.io/ios/app/caliber-strength-training/id1482405410/reviews)** |
| Number of ratings | **139K** | 6.1K |
| Positive reviews | 44.0% of reviews | **78.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#69** | — |
| Size | 575 MB | 59 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [WELLTECH APPS LIMITED](https://appshunter.io/developer/1450265454) | [Caliber Fitness, Inc](https://appshunter.io/developer/1482405409) |

## What reviewers say

### Muscle Booster Workout Tracker

[App page](https://appshunter.io/ios/app/muscle-booster-workout-tracker/id1446447749)

**Currently charting:** #69 Top Grossing · Health & Fitness, #90 Top Free · Health & Fitness (US App Store)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week Subscription | $9.99 | per 7 days |
| 1 Week Subscription | $9.99 | per 7 days |
| 1 Week Subscription | $14.99 | per 7 days |
| 1 Month Premium | $14.99 | per month |
| Muscle Booster | $14.99 | per month |
| Muscle Booster Workout Premium | $19.99 | per month |
| 1 Month Subscription | $19.99 | per month |
| 1 Month 22.99 with 7-day free trial | $22.99 | per month |
| 1 Month Subscription | $24.99 | per month |
| 3 Month Subscription | $29.99 | per 3 months |
| 3 Month Premium | $39.99 | per 3 months |
| 3 Months Subscription | $39.99 | per 3 months |
| 1 Year Premium | $59.99 | per year |
| Muscle Booster Premium | $59.99 | per year |
| 12 Month Subscription | $79.99 | per year |
| Premium Bundle | $29.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

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

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/caliber-strength-training/id1482405410)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caliber Supporter (Monthly) | $3.00 | per month |
| Caliber Supporter (Monthly) | $5.00 | per month |
| Caliber Plus (Monthly) | $6.00 | per month |
| Caliber Plus (Monthly) | $6.00 | per month |
| Caliber Supporter (Monthly) | $7.00 | per month |
| Caliber Supporter (Monthly) | $9.00 | per month |
| Caliber Plus (Monthly) | $9.00 | per month |
| Caliber Plus (Monthly) | $12.00 | per month |
| Caliber Pro (Monthly) | $19.00 | per month |
| Caliber Pro (Monthly) | $19.00 | per month |
| Caliber Plus (Yearly) | $36.00 | per year |
| Caliber Pro (3 Months) | $49.00 | per 3 months |
| Caliber Pro (3 Months) | $49.00 | per 3 months |
| Caliber Plus (Yearly) | $54.00 | per year |
| Caliber Plus (Yearly) | $72.00 | per year |
| Caliber Plus (Yearly) | $72.00 | per year |
| Caliber Pro (Yearly) | $169.00 | per year |
| Caliber Pro (Yearly) | $169.00 | per year |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- 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**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*