# SpeedMath Trainer vs Lethe chess

The clearest difference is in-app purchases: Lethe chess at none against SpeedMath Trainer's 1. Lethe chess also leads on ads (none vs shown). SpeedMath Trainer's advantage is iOS requirement (16.6 vs 18.0). On price and device support there is nothing between them.

Both are free to download. SpeedMath Trainer sells 1 one-off in-app purchase. Lethe chess asks for nothing beyond the download.

## The numbers

| Metric | SpeedMath Trainer | Lethe chess |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | — |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 80 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fumihiro Kawasaki](https://appshunter.io/developer/1246668885) | [Henry Houghton](https://appshunter.io/developer/1809789604) |

## What reviewers say

### SpeedMath Trainer

[App page](https://appshunter.io/ios/app/speedmath-trainer/id6741766444)

Engage in rapid, rhythm-based mental math exercises to boost focus, reaction time, and arithmetic skills. This app offers timed challenges with instant feedback and detailed performance tracking in a visually appealing interface.

**Highlights:** Short, timed mental math challenges, Rhythm-based problem solving, Performance tracking dashboards, Detailed results with breakdowns, Achievement sharing and friend challenges, Premium mode for full access and ad removal

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SpeedMath Premium | $0.99 | one-time |


### Lethe chess

[App page](https://appshunter.io/ios/app/lethe-chess/id6758116553)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SpeedMath Trainer free?

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

### Is Lethe chess free?

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

### Do SpeedMath Trainer or Lethe chess have ads?

SpeedMath Trainer shows ads; Lethe chess 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.*