# THE I/O vs Apolo Stark

THE I/O and Apolo Stark are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

THE I/O ships an update every 4 months, Apolo Stark every 6 months. The most recent releases landed on October 24, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | THE I/O | Apolo Stark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (14 ratings)](https://appshunter.io/ios/app/the-io/id1576813737/reviews)** | — |
| Number of ratings | **14** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | Free | — |
| Size | 195 MB | 36 MB |
| Requires iOS | 12.0 | 12.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The IO](https://appshunter.io/developer/1576813739) | [Apolo Stark Marbella 2016 SL](https://appshunter.io/developer/1727302025) |

## What reviewers say

### THE I/O

[App page](https://appshunter.io/ios/app/the-io/id1576813737)

Book challenging and surprising group fitness classes. Manage your personal details and access contact information easily. Discover more features and expect the unexpected.

**Highlights:** Book group fitness classes, Manage personal details, Access contact information, Discover new features, Challenging workouts

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

**In-app purchases:** none


### Apolo Stark

[App page](https://appshunter.io/ios/app/apolo-stark/id6476604344)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is THE I/O free?

THE I/O is free to download, with no in-app purchases.

### Is Apolo Stark free?

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

### Do THE I/O or Apolo Stark have ads?

Neither THE I/O nor Apolo Stark shows ads.

### Which is updated more often, THE I/O or Apolo Stark?

THE I/O ships an update every 4 months, and Apolo Stark every 6 months. Most recently, THE I/O was updated on October 24, 2026 and Apolo Stark on October 3, 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.*