# 脳トレ21 vs ChromaBus Passenger Sort

The clearest difference is update cadence: ChromaBus Passenger Sort at fortnightly against 脳トレ21's every 3 months. 脳トレ21's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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

脳トレ21 ships an update every 3 months, ChromaBus Passenger Sort fortnightly. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 脳トレ21 | ChromaBus Passenger Sort |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.4 (7 ratings)](https://appshunter.io/ios/app/chromabus-passenger-sort/id6763509144/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | — | Ad-supported |
| Size | 107 MB | 250 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ZERONE](https://appshunter.io/developer/1708775781) | [Cankurt Manay](https://appshunter.io/developer/1895349052) |

## What reviewers say

### 脳トレ21

[App page](https://appshunter.io/ios/app/21/id1471846944)

**Features:** macOS Compatibility

**In-app purchases:** none


### ChromaBus Passenger Sort

[App page](https://appshunter.io/ios/app/chromabus-passenger-sort/id6763509144)

A puzzle game where you guide colorful buses through traffic jams. Match buses with passengers to clear the grid and advance through challenging levels. Features include multiple themes and helpful in-game calculators.

**Highlights:** 20 challenging levels, FIFO waiting system, Multiple bus sizes and colors, Live passenger boarding animations, In-game calculators for strategy, Multiple visual themes, High score tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is 脳トレ21 free?

脳トレ21 is free to download, with no in-app purchases.

### Is ChromaBus Passenger Sort free?

ChromaBus Passenger Sort is free to download, with no in-app purchases.

### Do 脳トレ21 or ChromaBus Passenger Sort have ads?

Both 脳トレ21 and ChromaBus Passenger Sort show ads.

### Which is updated more often, 脳トレ21 or ChromaBus Passenger Sort?

脳トレ21 ships an update every 3 months, and ChromaBus Passenger Sort fortnightly. Most recently, 脳トレ21 was updated on November 11, 2026 and ChromaBus Passenger Sort on November 5, 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.*