# Serial 7s vs ColorBlox

The clearest difference is update cadence: ColorBlox at every 5 days against Serial 7s's every 5 months. On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Serial 7s ships an update every 5 months, ColorBlox every 5 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Serial 7s | ColorBlox |
| --- | --- | --- |
| 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 | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | Ad-supported | Ad-supported |
| Size | 42 MB | 95 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [HFX Lab](https://appshunter.io/developer/1139262927) | [BananaBlox](https://appshunter.io/developer/1701444890) |

## 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


### ColorBlox

[App page](https://appshunter.io/ios/app/colorblox/id6502119707)

A colorful puzzle game that challenges players to match a target grid by selecting colored shapes. It offers a relaxing yet engaging experience suitable for all ages, perfect for quick sessions or extended play.

**Highlights:** Brain-teasing puzzles, Classic puzzle mechanics, Fresh, colorful twist, Relaxing and challenging gameplay, Suitable for all ages, Multiple levels

**In-app purchases:** none


## Frequently asked questions

### Is Serial 7s free?

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

### Is ColorBlox free?

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

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

Both Serial 7s and ColorBlox show ads.

### Which is updated more often, Serial 7s or ColorBlox?

Serial 7s ships an update every 5 months, and ColorBlox every 5 days. Most recently, Serial 7s was updated on November 4, 2026 and ColorBlox on October 30, 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.*