# Muscle Sisters vs RT45 Fit

The clearest difference is rating: RT45 Fit at 5.0 against Muscle Sisters's 4.5. RT45 Fit also leads on review sentiment (100% vs 79%). Muscle Sisters's advantage is ratings volume (123 vs 7) and iOS requirement (13.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Muscle Sisters sells 4 in-app purchases, starting at $19.99 per month and RT45 Fit sells 3 in-app purchases, starting at $35.00 per month. Whichever you choose, the download price is not the number that matters.

RT45 Fit holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Muscle Sisters has 123 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 79% of Muscle Sisters's written reviews are positive against 100% of RT45 Fit's.

Muscle Sisters ships an update fortnightly, RT45 Fit every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Muscle Sisters | RT45 Fit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (123 ratings)](https://appshunter.io/ios/app/muscle-sisters/id6446286232/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/rt45-fit/id6757597243/reviews)** |
| Number of ratings | **123** | 7 |
| Positive reviews | 78.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Subscription | Subscription |
| Size | 45 MB | 133 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Muscle Sisters, LLC](https://appshunter.io/developer/1677143858) | [RENUEVATE 45 s.a.s](https://appshunter.io/developer/1867738738) |

## 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 |


### RT45 Fit

[App page](https://appshunter.io/ios/app/rt45-fit/id6757597243)

This app offers comprehensive fitness and nutrition guidance to help users achieve their health goals, whether it's fat loss, muscle gain, or a healthier lifestyle. It provides access to training programs, meal plans, recipes, and community support.

**Highlights:** Access to all training programs, Guided video workouts, Home and gym routines, Full nutrition and recipe section, Progress tracking, Apple Health integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Start | $35.00 | per month |
| Start - Quaterly | $99.00 | per 3 months |
| Start- Yearly | $269.99 | per year |


## Frequently asked questions

### Is Muscle Sisters free?

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

### Is RT45 Fit free?

RT45 Fit is free to download, with in-app purchases available.

### Which has better reviews, Muscle Sisters or RT45 Fit?

RT45 Fit is rated higher. Muscle Sisters averages 4.5 out of 5 from 123 ratings, while RT45 Fit averages 5.0 from 7 ratings.

### Do Muscle Sisters or RT45 Fit have ads?

Neither Muscle Sisters nor RT45 Fit shows ads.

### Which is updated more often, Muscle Sisters or RT45 Fit?

Muscle Sisters ships an update fortnightly, and RT45 Fit every 2 weeks. Most recently, Muscle Sisters was updated on November 3, 2026 and RT45 Fit on October 31, 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.*