# Zudiro vs ECHO

The clearest difference is iOS requirement: Zudiro at 13.4 against ECHO's 15.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Zudiro | ECHO |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free | — |
| Size | 19 MB | 101 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Devanco](https://appshunter.io/developer/1568938055) | [wapon Inc.](https://appshunter.io/developer/563984006) |

## What reviewers say

### Zudiro

[App page](https://appshunter.io/ios/app/zudiro/id6736738835)

This logic puzzle game challenges players to fill a grid using multiplicative constraints. It offers an intellectual challenge for fans of math-based puzzles and number sense. Conquer all the challenges and master the art of multiplication.

**Highlights:** Multiplicative logic puzzles, Grid-filling challenges, Number sense testing, Intellectual challenges, Math-based puzzles

**In-app purchases:** none


### ECHO

[App page](https://appshunter.io/ios/app/echo-grids-number-puzzle/id6791798318)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zudiro free?

Zudiro is free to download, with no in-app purchases.

### Is ECHO free?

ECHO is free to download, with no in-app purchases.

### Do Zudiro or ECHO have ads?

Neither Zudiro nor ECHO 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.*