# Simple Flash Mental Arithmetic vs 5 Second Rule

The clearest difference is in-app purchases: Simple Flash Mental Arithmetic at none against 5 Second Rule's 2. Simple Flash Mental Arithmetic also leads on update cadence (every 2 months vs every 6 months) and device support (3 vs 1). 5 Second Rule's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. 5 Second Rule sells 2 in-app purchases, starting at $3.49 per 7 days. Simple Flash Mental Arithmetic asks for nothing beyond the download.

Simple Flash Mental Arithmetic ships an update every 2 months, 5 Second Rule every 6 months. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Simple Flash Mental Arithmetic | 5 Second Rule |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/5-second-rule-party-games/id1608192159/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | **Ad-supported** | Freemium |
| Size | 21 MB | 11 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Yuki Takeda](https://appshunter.io/developer/1021096508) | [Davin App LTD](https://appshunter.io/developer/1516282454) |

## What reviewers say

### Simple Flash Mental Arithmetic

[App page](https://appshunter.io/ios/app/simple-flash-mental-arithmetic/id1022200948)

Practice mental math with this application. Choose from various difficulty levels to train your arithmetic skills or engage in brain exercises for anti-aging. It's a straightforward tool for improving calculation speed and accuracy.

**Highlights:** Adjustable difficulty levels, Mental arithmetic training, Anti-aging brain exercises, Suitable for all skill levels

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

**In-app purchases:** none


### 5 Second Rule

[App page](https://appshunter.io/ios/app/5-second-rule-party-games/id1608192159)

This fast-paced party game challenges players to name three things related to a topic in just five seconds. It's perfect for gatherings, testing reflexes and creativity under pressure. Enjoy endless laughter with surprising answers every round.

**Highlights:** Built-in 5-second timer, 500+ unique questions, Fast-paced gameplay, Simple rules, Ad-free experience with Pro

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5 Second Guess - Weekly Pro | $3.49 | per 7 days |
| 5 Second Guess - Yearly Pro | $12.99 | per year |


## Frequently asked questions

### Is Simple Flash Mental Arithmetic free?

Simple Flash Mental Arithmetic is free to download, with no in-app purchases.

### Is 5 Second Rule free?

5 Second Rule is free to download, with in-app purchases available.

### Do Simple Flash Mental Arithmetic or 5 Second Rule have ads?

Simple Flash Mental Arithmetic shows ads; 5 Second Rule does not.

### Which is updated more often, Simple Flash Mental Arithmetic or 5 Second Rule?

Simple Flash Mental Arithmetic ships an update every 2 months, and 5 Second Rule every 6 months. Most recently, Simple Flash Mental Arithmetic was updated on October 13, 2026 and 5 Second Rule on October 12, 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.*