# The Underground PHX vs My Karma Studio

The clearest difference is ads: My Karma Studio at none against The Underground PHX's shown. My Karma Studio also leads on monetization model (free vs ad-supported). On price, rating, review sentiment and ratings volume there is nothing between them.

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 The Underground PHX against 4.9 for My Karma Studio. Both are backed by a comparable volume of ratings — 79 and 115 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

The Underground PHX ships an update every 3 weeks, My Karma Studio every 4 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | The Underground PHX | My Karma Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (79 ratings)](https://appshunter.io/ios/app/the-underground-phx/id6461867568/reviews)** | [4.9 (115 ratings)](https://appshunter.io/ios/app/my-karma-studio/id6737527224/reviews) |
| Number of ratings | 79 | **115** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Monetization | Ad-supported | **Free** |
| Size | 37 MB | 38 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Modern Yoga LLC](https://appshunter.io/developer/1702757443) | [Karma Studio North Scottsdale LLC](https://appshunter.io/developer/1776932418) |

## 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


### My Karma Studio

[App page](https://appshunter.io/ios/app/my-karma-studio/id6737527224)

Easily browse and purchase class packs or membership options. Book your class reservations and manage your schedule to stay organized and committed to your fitness goals.

**Highlights:** Purchase class packs and memberships, Browse class schedules, Manage class reservations, Track upcoming classes, Stay organized with fitness goals

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**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 My Karma Studio free?

My Karma Studio is free to download, with no in-app purchases.

### Which has better reviews, The Underground PHX or My Karma Studio?

The Underground PHX is rated higher. The Underground PHX averages 5.0 out of 5 from 79 ratings, while My Karma Studio averages 4.9 from 115 ratings.

### Do The Underground PHX or My Karma Studio have ads?

The Underground PHX shows ads; My Karma Studio does not.

### Which is updated more often, The Underground PHX or My Karma Studio?

The Underground PHX ships an update every 3 weeks, and My Karma Studio every 4 weeks. Most recently, The Underground PHX was updated on November 3, 2026 and My Karma Studio on November 4, 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.*