# O3 vs Catodoro

The clearest difference is in-app purchases: Catodoro at none against O3's 1. Catodoro also leads on update cadence (every 4 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. O3 sells 1 in-app purchase, starting at $6.00 per 7 days. Catodoro asks for nothing beyond the download.

O3 ships an update every 9 days, Catodoro every 4 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | O3 | Catodoro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/o3-study-with-friends/id6730118317/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 171 MB | 11 MB |
| Requires iOS | **16.0** | 17.5 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [O3 Platforms Limited](https://appshunter.io/developer/1850051015) | [Suguru Tokuda](https://appshunter.io/developer/1755486582) |

## What reviewers say

### O3

[App page](https://appshunter.io/ios/app/o3-study-with-friends/id6730118317)

This community app allows users to earn digital currency for purchases like food and drinks. It's the official platform for engaging with the O3space community and its offerings.

**Highlights:** Earn o-coins, Spend o-coins on food and drinks, Official community app, Exclusive offers

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10HR COMBO | $6.00 | per 7 days |


### Catodoro

[App page](https://appshunter.io/ios/app/catodoro/id6741139264)

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

**In-app purchases:** none


## Frequently asked questions

### Is O3 free?

O3 is free to download, with in-app purchases available.

### Is Catodoro free?

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

### Do O3 or Catodoro have ads?

Neither O3 nor Catodoro shows ads.

### Which is updated more often, O3 or Catodoro?

O3 ships an update every 9 days, and Catodoro every 4 days. Most recently, O3 was updated on October 30, 2026 and Catodoro on October 28, 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.*