# ONO vs ISUD Zero

The clearest difference is price: ONO at Free against ISUD Zero's $0.99. ISUD Zero's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

ONO is free to download; ISUD Zero costs $0.99 up front. ONO sells 1 one-off in-app purchase. ISUD Zero asks for nothing beyond the download.

## The numbers

| Metric | ONO | ISUD Zero |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | — |
| Monetization | Free with in-app purchases | — |
| Size | 98 MB | 119 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Real Maxwell LLC](https://appshunter.io/developer/1296946363) | [Suwitcha Sugthana](https://appshunter.io/developer/372726303) |

## 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, Vision Pro support

**In-app purchases (1)**

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


### ISUD Zero

[App page](https://appshunter.io/ios/app/isud-zero/id6765926399)

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

**In-app purchases:** none


## Frequently asked questions

### Is ONO free?

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

### Is ISUD Zero free?

ISUD Zero costs $0.99, with no in-app purchases.

### Do ONO or ISUD Zero have ads?

ONO shows ads; ISUD Zero does not.

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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.*