# The Underground PHX vs MOM3NT

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.

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.

## The numbers

| Metric | The Underground PHX | MOM3NT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (79 ratings)](https://appshunter.io/ios/app/the-underground-phx/id6461867568/reviews)** | — |
| Number of ratings | **79** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Ad-supported | — |
| Size | 37 MB | 31 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Modern Yoga LLC](https://appshunter.io/developer/1702757443) | [Mom3nt Athletic Club LLC](https://appshunter.io/developer/1778425233) |

## What reviewers say

### The Underground PHX

[App page](https://appshunter.io/ios/app/the-underground-phx/id6461867568)

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.

**Highlights:** Book classes, Check-in for class, Pre-order add-ons, Find classes by day, time, instructor, Explore instructors and playlists, Get promotion alerts

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### MOM3NT

[App page](https://appshunter.io/ios/app/mom3nt/id6737898627)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The Underground PHX free?

The Underground PHX is free to download, with no in-app purchases.

### Is MOM3NT free?

MOM3NT is free to download, with no in-app purchases.

### Do The Underground PHX or MOM3NT have ads?

The Underground PHX shows ads; MOM3NT does not.

### Which is updated more often, The Underground PHX or MOM3NT?

The Underground PHX ships an update every 3 weeks, and MOM3NT every 6 months. Most recently, The Underground PHX was updated on October 24, 2026 and MOM3NT on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*