Comparison

Muscle Sisters vs RT45 Fit

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

Head to head
About

Muscle Sisters

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
Read full description

Welcome to the Muscle Sisters App! A monthly subscription that gives you power to train on your own terms and unleash your inner strength. Each program is strategically created to help you achieve your specific goals, whether it's building muscle, gaining strength, or losing weight. Andre and Patty will personally guide you through each workout. These videos typically last around 45-60 minutes, giving you a comprehensive and immersive training experience. From warm-up to cool-down, they'll be there with you, pushing you to reach your full potential. Train in the comfort of your own home or push yourself to the limits at the gym – the choice is yours. Join the Muscle Sisters App today and start a transformative fitness adventure. Unleash your strength, achieve your goals, and become the best version of yourself with the guidance and support of Andre and Patty. Let's sweat, grow, and inspire together! The Muscle Sisters App is here to support you every step of the way. [Privacy Policy](https://www.musclesistersapp.com/privacy-policy) - Read our privacy policy. [Terms of Use](https://www.musclesistersapp.com/terms) - Read our terms of use.

About

RT45 Fit

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
Read full description

Welcome to RT45, the app designed to help you transform your body, your mind, and your habits from the inside out!
With your subscription, you gain full access to all our training programs, meal plans, recipes, community, coaching support, and much more. Whether your goal is fat loss, muscle building, improving performance, or simply adopting a healthier lifestyle, here you’ll find everything you need to achieve it. • Train at your own pace and level. We offer programs for beginners, intermediate, and advanced users, available 24/7 for home or gym workouts.
 • Guided video workouts. Each program includes recorded and explained routines, step-by-step, so you never train alone and always know exactly what to do.
 • Easy and practical nutrition. Get direct access to goal-based nutrition plans, healthy recipes, and tools to calculate your calories depending on your goal (fat loss/definition or muscle gain).
Our plans are semi-personalized thanks to our internal calculator and a wide variety of options based on your preferences. • Everything you need in one place. With RT45, you get motivation, professional guidance, clear routines, and a system designed to help you reach your goals sustainably. Today can be the first step toward your best self! The plan includes:
 • Access to all training programs.
 • Guided video workouts or list-style workouts.
 • Home and gym routines.
 • Full nutrition and recipe section.
 • Beginner, intermediate, and advanced programs.
 • Cardio programs.
• Programs for maternal populations.
 • Programs focused on weight loss and obesity.
 • Stretching and mobility sections. How It Works • Customer support via WhatsApp and directly through the app. • The first 7 days are FREE. If you cancel within that period, you will not be charged.
However, you must enter a payment method to access the trial. The free week applies only to new users; if you have had a subscription before, the charge will be made immediately.
 • If you are a new user and decide not to continue during the free week, you must cancel three (3) days before the billing date. • At the moment of subscribing, a $0.01 USD charge will be made to your credit card.
 • Subscriptions renew automatically. If you do not wish to continue, you must cancel at least three (3) days before the renewal date.
 • Training programs start every Monday. While waiting for your selected program to begin, you have unlimited access to all routines.
 Check-ins: Get a complete overview of your overall performance with easy check-ins and real-time updates. Progress Tracking: Stay on top of your progress with powerful analytical tools. Wearable Integration: Get a broader view of your results by connecting your Apple Health for real-time tracking. Note regarding Apple Health:
The app integrates with Apple Health to display your daily activity—distance, steps, active energy, and floors climbed—to help you reach your goals more effectively. The app also uses Apple Health to track calories burned and heart rate during a workout session when using an Apple Watch. DISCLAIMER: Users should consult with a physician before using this app and making any medical decisions.

Screenshots

Muscle Sisters4 screens
RT45 Fit4 screens

Verdict

The call

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.

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 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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Muscle Sisters versus RT45 Fit: the parameters behind the verdict, then further details
ParameterMuscle SistersRT45 Fit
PriceFreeFree
Rating4.5 (123 ratings)5.0 (7 ratings) — better
Positive reviews78.9% of reviews100.0% of reviews — better
Number of ratings123 — better7
Update frequencyFortnightly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionSubscription
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size45 MB133 MB
Age rating12+17+
DeveloperMuscle Sisters, LLCRENUEVATE 45 s.a.s

Customer experience

Muscle Sisters

All ratings55 ratings
Positive83.6%
Neutral3.6%
Negative12.7%
Written reviews19 reviews
Positive78.9%
Neutral10.5%
Negative10.5%

RT45 Fit

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Muscle Sisters

Subscriptions2
  • Monthly1 Month trial$19.991 Month
  • Annual3 Days trial$159.001 Year
One-time2
  • Monthly$29.99
  • Annual$179.99
3 purchases

RT45 Fit

Subscriptions3
  • Start7 Days trial$35.001 Month
  • Start - Quaterly7 Days trial$99.003 Months
  • Start- Yearly7 Days trial$269.991 Year

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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