# Slapstack Math vs EchoVis Quiz

The clearest difference is in-app purchases: Slapstack Math at none against EchoVis Quiz's 6. Slapstack Math also leads on iOS requirement (8.0 vs 13.0). EchoVis Quiz's advantage is update cadence (every 6 months vs every 19 months). On price, ads and device support there is nothing between them.

Both are free to download. EchoVis Quiz sells 6 one-off in-app purchases. Slapstack Math asks for nothing beyond the download.

Slapstack Math ships an update every 19 months, EchoVis Quiz every 6 months. The most recent releases landed on June 1, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Slapstack Math | EchoVis Quiz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/slapstack-math/id1209184917/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 6 months** |
| Monetization | Free | — |
| Size | 5 MB | 22 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [American Printing House for the Blind (APH)](https://appshunter.io/developer/704570515) | [Transition Technologies S.A.](https://appshunter.io/developer/388173587) |

## 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


### EchoVis Quiz

[App page](https://appshunter.io/ios/app/echovis-quiz/id1584085519)

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Package 1 | $1.99 | one-time |
| Package 2 | $1.99 | one-time |
| Package 3 | $1.99 | one-time |
| Package 4 | $1.99 | one-time |
| Package 6 | $1.99 | one-time |
| Package 5 | $1.99 | one-time |


## Frequently asked questions

### Is Slapstack Math free?

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

### Is EchoVis Quiz free?

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

### Do Slapstack Math or EchoVis Quiz have ads?

Neither Slapstack Math nor EchoVis Quiz shows ads.

### Which is updated more often, Slapstack Math or EchoVis Quiz?

Slapstack Math ships an update every 19 months, and EchoVis Quiz every 6 months. Most recently, Slapstack Math was updated on June 1, 2026 and EchoVis Quiz on September 20, 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.*