# O3 vs Readrrr

The clearest difference is review sentiment: O3 at 91% against Readrrr's 29%. O3 also leads on monetization model (free with in-app purchases vs subscription) and iOS requirement (16.0 vs 18). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. O3 sells 1 in-app purchase, starting at $6.00 per 7 days and Readrrr sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

O3 ships an update every 9 days, Readrrr fortnightly. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | O3 | Readrrr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (22 ratings)](https://appshunter.io/ios/app/readrrr-focus-reader/id6757683148/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | **90.9% of reviews** | 29.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 139 MB | 138 MB |
| Requires iOS | **16.0** | 18 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [O3 Platforms Limited](https://appshunter.io/developer/1850051015) | [Ocule AS](https://appshunter.io/developer/1729594111) |

## 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 |


### Readrrr

[App page](https://appshunter.io/ios/app/readrrr-focus-reader/id6757683148)

Enhance reading speed and focus with a distraction-free experience. This app uses RSVP technology to display words sequentially, helping you process text faster and track your comprehension progress.

**Highlights:** RSVP speed-reading technology, Customizable reading speeds, Distraction-free reading environment, PDF import and text extraction, Reading progress tracking, Cross-device synchronization

**Features:** macOS Compatibility, Safari Extension, Family Sharing, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Readrrr Monthly | $2.99 | per month |
| Weekly | $2.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Monthly | $7.99 | per month |
| Monthly | $9.99 | per month |
| Yearly | $19.99 | per year |
| Readrrr Yearly | $24.99 | per year |
| Yearly | $29.99 | per year |
| Yearly | $39.99 | per year |
| Readrrr Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is O3 free?

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

### Is Readrrr free?

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

### Do O3 or Readrrr have ads?

Neither O3 nor Readrrr shows ads.

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

O3 ships an update every 9 days, and Readrrr fortnightly. Most recently, O3 was updated on October 7, 2026 and Readrrr on October 16, 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.*