# Serial 7s vs Pi

The clearest difference is in-app purchases: Serial 7s at none against Pi's 5. Pi's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Pi sells 5 one-off in-app purchases. Serial 7s asks for nothing beyond the download.

## The numbers

| Metric | Serial 7s | Pi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/serial-7s/id6480178276/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | — |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 42 MB | 21 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [HFX Lab](https://appshunter.io/developer/1139262927) | [REMESHY LTD](https://appshunter.io/developer/1519992155) |

## What reviewers say

### Serial 7s

[App page](https://appshunter.io/ios/app/serial-7s/id6480178276)

This game challenges you to rapidly subtract 7 from a starting number until you can no longer continue. It's based on a cognitive test used to assess attention and memory, with consistent play potentially improving brain skills and helping to prevent cognitive decline.

**Highlights:** Serial 7 subtraction gameplay, Tests attention and memory, Helps prevent cognitive decline, Measures subtraction speed, Randomized starting numbers

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

**In-app purchases:** none


### Pi

[App page](https://appshunter.io/ios/app/pi-math-memory-puzzle-game/id6744679735)

Test your memory and math skills by recalling digits of Pi in a survival game. Unlock boosters to extend your game and improve your score. Perfect for all ages looking to sharpen their minds.

**Highlights:** Memorize Pi digits in survival mode, Unlock boosters for extended gameplay, Improve memory and mental math skills, Practice multiplication and math facts, Climb the leaderboard, Designed for all ages

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5K Credits | $0.99 | one-time |
| 12K Credits | $1.99 | one-time |
| 25K Credits | $2.99 | one-time |
| 50K Credits | $3.99 | one-time |
| 100K Credits | $4.99 | one-time |


## Frequently asked questions

### Is Serial 7s free?

Serial 7s is free to download, with no in-app purchases.

### Is Pi free?

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

### Do Serial 7s or Pi have ads?

Serial 7s shows ads; Pi 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.*