Comparison

Muster Up Fitness vs RX

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

Head to head
About

Muster Up Fitness

Features
Read full description

Muster Up — Find your team. Muster Up turns fitness into a team sport. Form a squad, join a competition, log workouts together, and grow stronger in body, mind, and spirit. Most fitness apps leave you to grind alone. Muster Up is built on the two strongest motivators there are: camaraderie and competition. You're placed on a team where every single member matters, then you go head-to-head with other teams in fitness competitions sized so no one can hide and no one gets left behind. A supportive team can be the missing piece for anyone who struggles to stay consistent — and a meaningful way to lift others up if you're already going strong. WHY MUSTER UP • Team vs. team competitions where every member counts • Daily teamwork that keeps you accountable — when you show up, your team notices; when you go quiet, they reach out • Track a full range of activities: cardio, strength, mobility, and mindfulness • Earn points, climb the leaderboard, and win together • Built-in chat, activity feed, and encouragement to keep the fire burning • Apple Health integration for automatic workout tracking CAMERA-VERIFIED ACTIVITIES Show your effort with live camera verification on supported activities. Complete a timed session or let the camera count reps for supported exercises. Successfully completed verified sessions earn bonus user points. Availability depends on the activity and competition. OPTIONAL PAID COMPETITIONS Choose a free competition or enter an optional paid competition for added accountability. Paid competitions use camera-verified activities, with the entry fee and participation requirements shown before you join. YOUR EFFORT COUNTS TOWARD A SHARED GOAL Team progress combines members' eligible activity submissions. If your team has a 1,000-rep goal and two teammates each submit 100 reps, your team is 20% of the way there. Follow your team's progress on the map. User points are personal rewards, separate from competition progress. BUILT ON THREE SIMPLE BELIEFS • Built to lift others, not just yourself • Strength worth having is strength you can share • Win the competition, win at life — together Join Muster Up and let it be a bridge to a supportive community, a healthier life, and a brighter future. Your team is waiting.

About

RX

This app provides a versatile workout timer designed for functional fitness. It supports various training formats like AMRAP, EMOM, and Tabata with customizable durations and clear visual cues. The app offers offline functionality, a high-contrast display, and the ability to stream to external screens.

Highlights
  • Multiple workout formats (AMRAP, EMOM, Tabata, RFT)
  • Customizable work/rest intervals
  • Large, high-contrast display
  • Landscape full-screen mode
  • Work/rest color coding
  • Stream timer to TV via AirPlay
  • Offline functionality
Features
Read full description

A WOD timer in your pocket, always ready when you are. No hunting for the gym clock. No dead remote batteries. No digging through menus before a workout. RX-Timer is built for one job: start training fast, see the clock clearly, and stay focused on the work. 100% free. No account. No ads. No subscription. Just a timer that does everything you need, without getting in the way. Every workout format • Count up for AMRAP and For Time • Count down for timed efforts, with optional pre-start countdown (3, 2, 1) • Intervals with work/rest rounds for EMOM, Tabata, RFT, and chipper-style sessions • Adjust any duration down to the second. Built for the gym • Huge digits you can read from across the room. • High contrast display • Landscape full-screen mode. Tap to start, pause, or resume • Work/rest colour coding. Red and green cues like the clock at your box • Clear beeps and haptics at starts, transitions, and finish • Sound works alongside your music Stream to a TV • Mirror the timer to AirPlay displays. • Perfect when your phone is propped up or you want the whole gym to see the clock. Track your training • See how many timers you have completed and view your activity on a heat map. • Built in, on your device, with no login. Zero friction • Works offline • No sign-up required • All settings and stats stay on your phone • Sound can be turned off anytime Whether you are hitting a WOD at the box, training in the garage, or travelling without a gym clock, RX-Timer is the timer you will actually want to open every session. RX-Timer is a workout timer for functional fitness. It is not a medical device, medication reminder, or prescription app.

Screenshots

Muster Up Fitness4 screens
RX4 screens

Verdict

The call

The clearest difference is device support: Muster Up Fitness at 3 against RX's 1. Muster Up Fitness also leads on iOS requirement (15.0 vs 17.0). 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Muster Up Fitness ships an update every 2 weeks, RX every 3 weeks. Both last shipped on October 31, 2026.

Scorecard2 real differences · 8 level
Muster Up Fitness versus RX: the parameters behind the verdict, then further details
ParameterMuster Up FitnessRX
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size70 MB4 MB
Age rating12+4+
DeveloperRobert MandelDaniel Thrnaholm

In-app purchases

None

Muster Up Fitness

No in-app purchases

None

RX

No in-app purchases

Questions

Is Muster Up Fitness free?
Muster Up Fitness is free to download, with no in-app purchases.
Is RX free?
RX is free to download, with no in-app purchases.
Do Muster Up Fitness or RX have ads?
Neither Muster Up Fitness nor RX shows ads.
Which is updated more often, Muster Up Fitness or RX?
Muster Up Fitness ships an update every 2 weeks, and RX every 3 weeks. Most recently, Muster Up Fitness was updated on October 31, 2026 and RX on October 31, 2026.

Other comparisons