# On/Off vs ISUD Zero

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

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

## The numbers

| Metric | On/Off | ISUD Zero |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/onoff-circuit-glow-puzzle/id905723117/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 29 months | — |
| Monetization | Free | — |
| Size | 8 MB | 119 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Red Hawk Studios, LLC](https://appshunter.io/developer/1297468167) | [Suwitcha Sugthana](https://appshunter.io/developer/372726303) |

## What reviewers say

### On/Off

[App page](https://appshunter.io/ios/app/onoff-circuit-glow-puzzle/id905723117)

This game challenges players to illuminate all squares on a grid. Clicking a square toggles its state and the state of adjacent squares, requiring strategic thinking to solve each puzzle.

**Highlights:** Grid-based puzzles, Toggle square states, Affects adjacent squares, Simple mechanics, Challenging logic

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| US English | $2.99 | 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 On/Off free?

On/Off is free to download, with in-app purchases available.

### Is ISUD Zero free?

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

### Do On/Off or ISUD Zero have ads?

Neither On/Off nor ISUD Zero shows ads.

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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.*