# O vs AUT Millennium

O and AUT Millennium 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.

O ships an update monthly, AUT Millennium every 2 months. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | O | AUT Millennium |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 194 MB | 100 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [o studio christchurch limited](https://appshunter.io/developer/1483845070) | [Perfect Gym Solutions Sp. z o.o.](https://appshunter.io/developer/1004382730) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-studio/id1483845071)

Manage your wellness journey with this app. View class schedules, book appointments, and access special in-app promotions. Streamline your health and fitness routine.

**Highlights:** View class schedules, Sign up for classes, Book appointments, Access exclusive promotions, Manage wellness routine

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

**In-app purchases:** none


### AUT Millennium

[App page](https://appshunter.io/ios/app/aut-millennium/id6451309373)

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

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is AUT Millennium free?

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

### Do O or AUT Millennium have ads?

Neither O nor AUT Millennium shows ads.

### Which is updated more often, O or AUT Millennium?

O ships an update monthly, and AUT Millennium every 2 months. Most recently, O was updated on October 14, 2026 and AUT Millennium on October 24, 2026.

---

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