The Underground PHX vs MOM3NT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Underground PHX
Book fitness classes, discover instructors, and explore playlists. This app allows you to reserve your spot, check in, and even pre-order studio add-ons directly from your phone.
- Book classes
- Check-in for class
- Pre-order add-ons
- Find classes by day, time, instructor
- Explore instructors and playlists
- Get promotion alerts
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Unparalleled classes, dope instructors and the most funky, inspired playlists combine forces to create The Underground Method workout. Get the app & book your ride, check-in for class before you get to the studio, shop or pre-order add-ons like a water bottle & towel all from your phone! GET THE 411 > Find classes by day, time and instructor. > Buy classes quickly and ahead of time. > Explore instructors and playlists. > Get alerts for exclusive promotions and new merch drops.
MOM3NT
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Download the MOM3NT app to easily book classes and manage your fitness experience - anytime, anywhere. Make a reservation, get added to a wait list, check your profile and membership status, and more – all from your device. Visit https://www.mom3ntathleticclub.com/ to learn more.
Screenshots
Verdict
The clearest difference is ads: MOM3NT at none against The Underground PHX's shown. The Underground PHX's advantage is update cadence (every 3 weeks vs every 6 months). On price, in-app purchases, device support and iOS requirement 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.
The Underground PHX ships an update every 3 weeks, MOM3NT every 6 months. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.
| Parameter | The Underground PHX | MOM3NT |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (79 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 79 — better | — |
| Update frequency | Every 3 weeks — better | Every 6 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 37 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Modern Yoga LLC | Mom3nt Athletic Club LLC |
In-app purchases
The Underground PHX
No in-app purchases
MOM3NT
No in-app purchases
Questions
Is The Underground PHX free?
Is MOM3NT free?
Do The Underground PHX or MOM3NT have ads?
Which is updated more often, The Underground PHX or MOM3NT?
Other comparisons
