# Muscle Sisters vs IBurn55

The clearest difference is in-app purchases: IBurn55 at none against Muscle Sisters's 4. IBurn55 also leads on rating (5.0 vs 4.5). Muscle Sisters's advantage is update cadence (fortnightly vs every 10 months) and ratings volume (117 vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Muscle Sisters sells 4 in-app purchases, starting at $19.99 per month. IBurn55 asks for nothing beyond the download.

IBurn55 holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Muscle Sisters has 117 ratings behind it against 3, so its average is the more settled of the two.

Muscle Sisters ships an update fortnightly, IBurn55 every 10 months. The most recent releases landed on October 25, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Muscle Sisters | IBurn55 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (117 ratings)](https://appshunter.io/ios/app/muscle-sisters/id6446286232/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/iburn55/id6464500039/reviews)** |
| Number of ratings | **117** | 3 |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 10 months |
| Monetization | Subscription | **Free** |
| Size | 45 MB | 31 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Muscle Sisters, LLC](https://appshunter.io/developer/1677143858) | [Iburn55 LLC](https://appshunter.io/developer/1706133478) |

## What reviewers say

### Muscle Sisters

[App page](https://appshunter.io/ios/app/muscle-sisters/id6446286232)

Access personalized monthly fitness programs designed by expert trainers to help you build muscle, gain strength, or lose weight. Follow along with guided video workouts that last 45-60 minutes, offering a comprehensive training experience from warm-up to cool-down.

**Highlights:** Personalized monthly fitness programs, Guided video workouts, Strength training, Muscle building, Weight loss programs, Home or gym training options

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $19.99 | per month |
| Annual | $159.00 | per year |
| Monthly | $29.99 | one-time |
| Annual | $179.99 | one-time |


### IBurn55

[App page](https://appshunter.io/ios/app/iburn55/id6464500039)

Easily book fitness classes and manage your entire fitness experience on the go. Make reservations, join waitlists, purchase class packages, and check your membership status. Stay updated on the latest products and services directly from your device.

**Highlights:** Book classes, Manage reservations, Join waitlists, Purchase class packages, Check profile and membership, View latest products and services

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Muscle Sisters free?

Muscle Sisters is free to download, with in-app purchases available.

### Is IBurn55 free?

IBurn55 is free to download, with no in-app purchases.

### Which has better reviews, Muscle Sisters or IBurn55?

IBurn55 is rated higher. Muscle Sisters averages 4.5 out of 5 from 117 ratings, while IBurn55 averages 5.0 from 3 ratings.

### Do Muscle Sisters or IBurn55 have ads?

Neither Muscle Sisters nor IBurn55 shows ads.

### Which is updated more often, Muscle Sisters or IBurn55?

Muscle Sisters ships an update fortnightly, and IBurn55 every 10 months. Most recently, Muscle Sisters was updated on October 25, 2026 and IBurn55 on October 17, 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.*