Muster Up Fitness vs RX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Muster Up Fitness
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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.
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.
- 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
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Muster Up Fitness ships an update every 2 weeks, RX every 3 weeks. Both last shipped on October 31, 2026.
| Parameter | Muster Up Fitness | RX |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 70 MB | 4 MB |
| Age rating | 12+ | 4+ |
| Developer | Robert Mandel | Daniel Thrnaholm |
In-app purchases
Muster Up Fitness
No in-app purchases
RX
No in-app purchases









