# Slapstack Math vs SoundEcho

The clearest difference is rating: Slapstack Math at 5.0 against SoundEcho's 4.3. Slapstack Math also leads on in-app purchases (none vs 1) and iOS requirement (8.0 vs 17.0). SoundEcho's advantage is update cadence (every 5 weeks vs every 19 months). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. SoundEcho sells 1 one-off in-app purchase. Slapstack Math asks for nothing beyond the download.

Slapstack Math holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Slapstack Math ships an update every 19 months, SoundEcho every 5 weeks. The most recent releases landed on September 13, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Slapstack Math | SoundEcho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/slapstack-math/id1209184917/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/soundecho/id1639116371/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 5 MB | 7 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [American Printing House for the Blind (APH)](https://appshunter.io/developer/704570515) | [Kristof Nijs](https://appshunter.io/developer/1608072573) |

## What reviewers say

### Slapstack Math

[App page](https://appshunter.io/ios/app/slapstack-math/id1209184917)

This game turns math flashcards into a fast-paced action and memory challenge. Players slap the table or perform other actions based on math problems and their answers, with customizable rules and difficulty.

**Highlights:** Math flashcard gameplay, Customizable action rules, Addition, subtraction, multiplication, division modes, Self-voicing and VoiceOver compatible, High-contrast colors and large print, Adjustable game speed

**In-app purchases:** none


### SoundEcho

[App page](https://appshunter.io/ios/app/soundecho/id1639116371)

A fun and accessible memory game using sound cues. Players match pairs of buttons that produce the same sound to clear the board. Supports multiple sound themes and player counts, with Game Center integration.

**Highlights:** Sound-based memory matching, VoiceOver accessibility, Animal and computer sound themes, Multiple difficulty levels (10, 15, 20 sounds), 2-4 player real-time multiplayer, Game Center integration

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Purchasing the app | $4.49 | one-time |


## Frequently asked questions

### Is Slapstack Math free?

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

### Is SoundEcho free?

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

### Which has better reviews, Slapstack Math or SoundEcho?

Slapstack Math is rated higher. Slapstack Math averages 5.0 out of 5 from 2 ratings, while SoundEcho averages 4.3 from 3 ratings.

### Do Slapstack Math or SoundEcho have ads?

Neither Slapstack Math nor SoundEcho shows ads.

### Which is updated more often, Slapstack Math or SoundEcho?

Slapstack Math ships an update every 19 months, and SoundEcho every 5 weeks. Most recently, Slapstack Math was updated on September 13, 2026 and SoundEcho on September 25, 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.*