# Halcyon Studios vs Diesel Optimization

The clearest difference is ads: Diesel Optimization at none against Halcyon Studios's shown. Halcyon Studios's advantage is update cadence (monthly vs every 2 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.

Halcyon Studios ships an update monthly, Diesel Optimization every 2 months. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Halcyon Studios | Diesel Optimization |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (31 ratings)](https://appshunter.io/ios/app/halcyon-studios/id6508175239/reviews)** | — |
| Number of ratings | **31** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 36 MB | 40 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Yoga Barbie LLC](https://appshunter.io/developer/1755431871) | [DIESEL FITNESS, INC.](https://appshunter.io/developer/1886793917) |

## What reviewers say

### Halcyon Studios

[App page](https://appshunter.io/ios/app/halcyon-studios/id6508175239)

Manage your fitness account, view class schedules, and book your next session. Stay updated with the latest offerings and easily reserve your spot.

**Highlights:** Account viewing, Class schedule, Booking classes, Fitness management

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Diesel Optimization

[App page](https://appshunter.io/ios/app/diesel-optimization/id6760916740)

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

**In-app purchases:** none


## Frequently asked questions

### Is Halcyon Studios free?

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

### Is Diesel Optimization free?

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

### Do Halcyon Studios or Diesel Optimization have ads?

Halcyon Studios shows ads; Diesel Optimization does not.

### Which is updated more often, Halcyon Studios or Diesel Optimization?

Halcyon Studios ships an update monthly, and Diesel Optimization every 2 months. Most recently, Halcyon Studios was updated on October 2, 2026 and Diesel Optimization on October 1, 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.*