# Sudoku BrainTrain vs Bubu Sudoku

The clearest difference is in-app purchases: Sudoku BrainTrain at none against Bubu Sudoku's 1. Sudoku BrainTrain also leads on ads (none vs shown). Bubu Sudoku's advantage is update cadence (every 9 days vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Bubu Sudoku sells 1 one-off in-app purchase. Sudoku BrainTrain asks for nothing beyond the download.

Sudoku BrainTrain ships an update every 3 weeks, Bubu Sudoku every 9 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Sudoku BrainTrain | Bubu Sudoku |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Size | 10 MB | 11 MB |
| Requires iOS | 18.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Curayt, LLC](https://appshunter.io/developer/1012363586) | [Haosheng Li](https://appshunter.io/developer/1437181734) |

## What reviewers say

### Sudoku BrainTrain

[App page](https://appshunter.io/ios/app/sudoku-braintrain/id6759259527)

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

**In-app purchases:** none


### Bubu Sudoku

[App page](https://appshunter.io/ios/app/bubu-sudoku/id6787663053)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sudoku Pro | $9.99 | one-time |


## Frequently asked questions

### Is Sudoku BrainTrain free?

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

### Is Bubu Sudoku free?

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

### Do Sudoku BrainTrain or Bubu Sudoku have ads?

Bubu Sudoku shows ads; Sudoku BrainTrain does not.

### Which is updated more often, Sudoku BrainTrain or Bubu Sudoku?

Sudoku BrainTrain ships an update every 3 weeks, and Bubu Sudoku every 9 days. Most recently, Sudoku BrainTrain was updated on October 31, 2026 and Bubu Sudoku 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.*