# Crystal Math vs Ishido

The clearest difference is review sentiment: Crystal Math at 100% against Ishido's 43%. Crystal Math also leads on rating (5.0 vs 3.1) and device support (3 vs 1). Ishido's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. Crystal Math sells 3 one-off in-app purchases. Ishido asks for nothing beyond the download.

Crystal Math holds the better App Store score, 5.0 against 3.1. Both are backed by a comparable volume of ratings — 3 and 14 respectively. Written reviews point the same way: 100% of Crystal Math's written reviews are positive against 43% of Ishido's.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Crystal Math | Ishido |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/crystal-math-numbers-on-speed/id1261401422/reviews)** | [3.1 (14 ratings)](https://appshunter.io/ios/app/ishido/id1314137178/reviews) |
| Number of ratings | 3 | **14** |
| Positive reviews | **100.0% of reviews** | 42.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 28 MB | 37 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rafael Kolloch](https://appshunter.io/developer/985182742) | [Darin Koenig](https://appshunter.io/developer/319817574) |

## What reviewers say

### Crystal Math

[App page](https://appshunter.io/ios/app/crystal-math-numbers-on-speed/id1261401422)

This game offers four distinct modes to sharpen your mental arithmetic. Compete against the clock, challenge other players, or practice at your own pace to become a math champion and unlock achievements.

**Highlights:** Daily challenges with leaderboards, Player vs. player duels, 30-second time attack mode, Free exploration mode, Avatar customization, Achievement unlocking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hipster | $0.99 | one-time |
| Famous | $0.99 | one-time |
| Cinema | $0.99 | one-time |


### Ishido

[App page](https://appshunter.io/ios/app/ishido/id1314137178)

A meditative puzzle game where players match stones based on color and symbol to clear a board. It offers both strategic point-scoring and a relaxing, mindful experience.

**Highlights:** Match stones by color and symbol, Strategic point scoring, Meditative gameplay mode, 72 unique stones, 8x12 game board, Next stone preview

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Crystal Math free?

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

### Is Ishido free?

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

### Which has better reviews, Crystal Math or Ishido?

Crystal Math is rated higher. Crystal Math averages 5.0 out of 5 from 3 ratings, while Ishido averages 3.1 from 14 ratings.

### Do Crystal Math or Ishido have ads?

Crystal Math shows ads; Ishido does not.

### Which is updated more often, Crystal Math or Ishido?

Crystal Math ships an update every 2 weeks, and Ishido every 2 weeks. Most recently, Crystal Math was updated on November 2, 2026 and Ishido on November 4, 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.*