# O3 vs Zenodot

O3 and Zenodot 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. O3 sells 1 in-app purchase, starting at $6.00 per 7 days and Zenodot sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

O3 ships an update every 9 days, Zenodot every 8 days. The most recent releases landed on October 30, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | O3 | Zenodot |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 8 days** |
| Monetization | Free with in-app purchases | — |
| Size | 171 MB | 99 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [O3 Platforms Limited](https://appshunter.io/developer/1850051015) | [JACKIE CHEN](https://appshunter.io/developer/6793097516) |

## What reviewers say

### O3

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

Discover and access 24/7 study cafes designed for focused work and social interaction. Book spaces, connect with others, and enhance your productivity in a unique cafe environment.

**Highlights:** Unlock 24/7 study cafes, Book study spaces, Work and study environments, Meet new people, Socialize in cafes

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

**In-app purchases (1)**

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


### Zenodot

[App page](https://appshunter.io/ios/app/zenodot-ai-notes/id6793097514)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zenodot Pro (1 Month) | $9.99 | per month |


## Frequently asked questions

### Is O3 free?

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

### Is Zenodot free?

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

### Do O3 or Zenodot have ads?

Neither O3 nor Zenodot shows ads.

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

O3 ships an update every 9 days, and Zenodot every 8 days. Most recently, O3 was updated on October 30, 2026 and Zenodot on October 19, 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.*