Comparison

Pilates Underground vs Fourth Space Studios

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

Head to head
About

Pilates Underground

This app allows users to book and manage Pilates classes, including group reformer sessions and private Cadillac workouts. It offers various class levels from beginner to advanced, focusing on building strength, resilience, and a healthy foundation.

Highlights
  • Book and manage Pilates sessions
  • Group reformer classes
  • Private Cadillac workouts
  • Multiple class levels (Foundations to Level 3)
  • Cardio and Strength focused classes
  • Community support
Features
Read full description

At Pilates Underground in Utah, we're redefining what Pilates can look and feel like: from group reformer to one-on-one Cadillac workouts that challenge, a studio that feels alive, and a community that's got your back. We're focused on helping people move better, feel stronger, and build a long-lasting foundation for health. Our space offers energizing Pilates group classes on high quality reformers trusted by studios worldwide, as well as private and duet sessions on the renowned Cadillac. We ensure that every client, from injured to beginner and advanced, has the tools and support to thrive. We also offer class packs and monthly membership options to fit your lifestyle needs. Rooted in resilience and energy. Grounded in movement and community. Pilates Underground is always rising. Rise with us — reserve and manage your sessions conveniently on the app. Easy booking, no phone calls necessary. Here’s a look at our Pilates classes: Foundations – Beginner-friendly and capped at 6 people, this class takes the intimidation out of Pilates. Learn how to set up your reformer, adjust springs, and move with proper form while building strength and confidence to take on the next level. Level 1 – Step beyond the basics with a focus on core strength, balance, and stability. A steady pace and clear instruction make this the ideal bridge from Foundations. Level 2 – More resistance, dynamic sequences, and smooth transitions. This class builds endurance, challenges control, and connects strength with fluid movement. Level 3 – Advanced sequences designed to push your limits. Expect higher resistance, complex choreography, and next-level strength and stamina. Cardio – Add intensity to your Pilates practice with the jump board. This heart-pumping class blends cardio bursts with reformer precision for a full-body sweat. Strength – Pilates meets resistance training. Using added weights and reformer work, this class sculpts muscle, builds power, and delivers a true strength workout. Not sure where to start? We’ll guide you to the right fit — just ask.

About

Fourth Space Studios

Easily browse and purchase class packs or memberships. View the schedule, filter classes by type, and manage your reservations to stay organized and committed to your fitness goals.

Highlights
  • Purchase class packs and memberships
  • Browse class schedule
  • Filter classes by type
  • Manage class reservations
  • Stay organized with fitness goals
Features
Read full description

Features: - Purchase Class Packs and Memberships Easily browse and purchase our class packs or membership options - View our schedule Filter classes by type to find the perfect fit for your routine. - Manage your reservations Book your class reservations with ease. Keep track of your upcoming classes and manage your schedule to stay organized and committed to your fitness goals.

Screenshots

Pilates Underground4 screens
Fourth Space Studios4 screens

Verdict

The call

The clearest difference is update cadence: Fourth Space Studios at every 3 weeks against Pilates Underground's every 11 months. Pilates Underground's advantage is ratings volume (8 vs 2). On price, rating, 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Pilates Underground against 5.0 for Fourth Space Studios. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

UpkeepUpdate frequency

Pilates Underground ships an update every 11 months, Fourth Space Studios every 3 weeks. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

Scorecard2 real differences · 7 level
Pilates Underground versus Fourth Space Studios: the parameters behind the verdict, then further details
ParameterPilates UndergroundFourth Space Studios
PriceFreeFree
Rating5.0 (8 ratings)5.0 (2 ratings)
Number of ratings8 — better2
Update frequencyEvery 11 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad — betteriPhone
Requires iOS16.416.0 — better
Further details — not scored
Size121 MB38 MB
Age rating12+4+
DeveloperSutra Fitness, Inc.Fourth Space Studios, Inc.

In-app purchases

None

Pilates Underground

No in-app purchases

None

Fourth Space Studios

No in-app purchases

Questions

Is Pilates Underground free?
Pilates Underground is free to download, with no in-app purchases.
Is Fourth Space Studios free?
Fourth Space Studios is free to download, with no in-app purchases.
Which has better reviews, Pilates Underground or Fourth Space Studios?
Pilates Underground and Fourth Space Studios are both rated 5.0 out of 5 on the App Store, from 8 and 2 ratings respectively.
Do Pilates Underground or Fourth Space Studios have ads?
Neither Pilates Underground nor Fourth Space Studios shows ads.
Which is updated more often, Pilates Underground or Fourth Space Studios?
Pilates Underground ships an update every 11 months, and Fourth Space Studios every 3 weeks. Most recently, Pilates Underground was updated on November 5, 2026 and Fourth Space Studios on November 10, 2026.

Other comparisons