# ONO vs The Quest for Knowledge

The clearest difference is in-app purchases: The Quest for Knowledge at none against ONO's 1. The Quest for Knowledge also leads on ads (none vs shown) and update cadence (every 11 days vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. ONO sells 1 one-off in-app purchase. The Quest for Knowledge asks for nothing beyond the download.

ONO ships an update every 2 months, The Quest for Knowledge every 11 days. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | ONO | The Quest for Knowledge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/ono-think-straight/id1533608908/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 95 MB | 6 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Real Maxwell LLC](https://appshunter.io/developer/1296946363) | [NapTech Lab](https://appshunter.io/developer/1561520677) |

## What reviewers say

### ONO

[App page](https://appshunter.io/ios/app/ono-think-straight/id1533608908)

A unique logic puzzle game where you clear 'O's from the screen to achieve 'ONO'. It offers a hybrid casual puzzle experience with increasing complexity and variety. Designed to improve clarity, focus, and working memory through engaging gameplay.

**Highlights:** Unique logic puzzle mechanics, Chain reaction gameplay, Hybrid casual puzzle experience, Improves clarity and focus, 24 levels with increasing difficulty, Free play mode, Thousands of puzzle variations

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads in ONO | $0.99 | one-time |


### The Quest for Knowledge

[App page](https://appshunter.io/ios/app/the-quest-for-knowledge/id6504160543)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ONO free?

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

### Is The Quest for Knowledge free?

The Quest for Knowledge is free to download, with no in-app purchases.

### Do ONO or The Quest for Knowledge have ads?

ONO shows ads; The Quest for Knowledge does not.

### Which is updated more often, ONO or The Quest for Knowledge?

ONO ships an update every 2 months, and The Quest for Knowledge every 11 days. Most recently, ONO was updated on September 10, 2026 and The Quest for Knowledge on September 11, 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.*