X4 FIT vs THREE15 STUDIO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
X4 FIT
This app facilitates booking and managing fitness classes at a boutique gym. It offers efficient, full-body functional workouts with on-screen demos and varied routines. Members can easily register, book classes, and purchase memberships or retail items.
- Coach-led group fitness classes
- 50-minute full-body workouts
- On-screen exercise demos
- Constantly changing routines
- Class booking for members
- Membership and retail purchasing
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X4 FIT is a boutique group fitness gym offering 50-minute, full-body functional workouts designed for efficiency and variety. Each coach-led class features on-screen demos and a constantly changing workout—so no two workouts are ever the same. Our goal is to make incorporating fitness into our members’ busy lives as easy as possible so they can get in, work out, and get back out to the lives they love. The only requirements are commitment and effort. The X4 workout leverages the four elements of fitness: VO₂ Max Work, Resistance Training, Metabolic Intervals, Functional Movement Patterns. It’s a scientific methodology that ensures a full-body workout targeting cardiovascular health, muscular ability, power development, and metabolic conditioning that directly transfers to strength outside the gym. Our premium mobile app allows easy first-time registration, existing member class booking, and membership/retail purchasing!
THREE15 STUDIO
This app offers a variety of fitness classes combining cycling, barre, and strength training. Explore different class lengths and formats designed for all fitness levels, from beginner to advanced.
- Rhythm-based cycling
- Barre workouts
- Strength training
- Full body stretching
- Beginner-friendly classes
- Extended and condensed class options
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THREE15 THREE15 is our 55 minute signature class that combines 15 minutes of rhythm-based cycling, 15 minutes of barre and 15 minutes of strength work. We start each class with a warm-up on the bike and finish each class with a full body stretch. RIDE45 RIDE45 ride is a 45 minute rhythm-based cycle only class that incorporates the THREE15 method focusing on legs for 15 minutes, arms for 15 minutes and your core for 15 minutes. BONUS RIDE BONUS RIDE is a 75 minute class that combines our signature THREE15 class with the addition of a 20 minute “bonus” ride on the bike. THIRTY5 THIRTY5 is a 35 minute class that is a condensed version of our signature THREE15 class. It is a class that was created to give clients all of the burn of a signature class in a shorter amount of time. BASIC Basic is a class that we encourage all of our new clients to attend to gain a better understanding of the THREE15 method. This 45 minute class is a slower paced version of our signature THREE15 class that will help you perfect your form. STRENGTH45 STRENGTH45 is a 45 minute rhythm-based class that begins on the bike followed by strength training on the floor with heavier weights. EXTEND45 EXTEND45 is a 45 minute class focused on stretching, flexibility, and mobility while improving overall strength.
Screenshots
Verdict
The clearest difference is ads: X4 FIT at none against THREE15 STUDIO's shown. X4 FIT also leads on ratings volume (215 vs 51). THREE15 STUDIO's advantage is monetization model (ad-supported vs free with in-app purchases). On price, rating, update cadence 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.
On the App Store both sit at effectively the same score — 5.0 for X4 FIT against 5.0 for THREE15 STUDIO. Both are backed by a comparable volume of ratings — 215 and 51 respectively.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 1, 2026 and September 8, 2026 respectively.
| Parameter | X4 FIT | THREE15 STUDIO |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (215 ratings) | 5.0 (51 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 215 — better | 51 |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 38 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | X⁴, LLC | THREE 15, LLC |
Customer experience
X4 FIT
THREE15 STUDIO
In-app purchases
X4 FIT
No in-app purchases
THREE15 STUDIO
No in-app purchases









