# Optimyze vs The Underground PHX

The clearest difference is review sentiment: The Underground PHX at 100% against Optimyze's 0%. The Underground PHX also leads on rating (5.0 vs 4.0) and ratings volume (73 vs 2). Optimyze's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 16.0). On price, update cadence, ads and in-app purchases 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 holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: The Underground PHX has 73 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Optimyze's written reviews are positive against 100% of The Underground PHX's.

Optimyze ships an update monthly, The Underground PHX every 3 weeks. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Optimyze | The Underground PHX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/optimyze/id1453056762/reviews) | **[5.0 (73 ratings)](https://appshunter.io/ios/app/the-underground-phx/id6461867568/reviews)** |
| Number of ratings | 2 | **73** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Ad-supported | Ad-supported |
| Size | 123 MB | 37 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [The lab phx llc](https://appshunter.io/developer/1453056761) | [Modern Yoga LLC](https://appshunter.io/developer/1702757443) |

## What reviewers say

### Optimyze

[App page](https://appshunter.io/ios/app/optimyze/id1453056762)

Plan and schedule your classes with ease. View class schedules, sign up for sessions, and find studio location information directly from your mobile device. Optimize your time and enhance convenience.

**Highlights:** View class schedules, Sign up for classes, View studio location, Optimize time, Schedule classes

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Optimyze free?

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

### Is The Underground PHX free?

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

### Which has better reviews, Optimyze or The Underground PHX?

The Underground PHX is rated higher. Optimyze averages 4.0 out of 5 from 2 ratings, while The Underground PHX averages 5.0 from 73 ratings.

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

Both Optimyze and The Underground PHX show ads.

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

Optimyze ships an update monthly, and The Underground PHX every 3 weeks. Most recently, Optimyze was updated on October 2, 2026 and The Underground PHX on October 13, 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.*