# Riichi Compass vs MJ DB

The clearest difference is in-app purchases: Riichi Compass at none against MJ DB's 1. Riichi Compass also leads on iOS requirement (15.1 vs 18.0). MJ DB's advantage is update cadence (every 2 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. MJ DB sells 1 one-off in-app purchase. Riichi Compass asks for nothing beyond the download.

Riichi Compass ships an update every 2 weeks, MJ DB every 2 days. The most recent releases landed on May 17, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Riichi Compass | MJ DB |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Size | 35 MB | 28 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [禹 梁](https://appshunter.io/developer/1864648892) | [wilson chung](https://appshunter.io/developer/564506285) |

## What reviewers say

### Riichi Compass

[App page](https://appshunter.io/ios/app/riichi-compass/id6757171107)

**Features:** macOS Compatibility

**In-app purchases:** none


### MJ DB

[App page](https://appshunter.io/ios/app/mj-db/id6759273739)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Riichi Compass free?

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

### Is MJ DB free?

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

### Do Riichi Compass or MJ DB have ads?

Neither Riichi Compass nor MJ DB shows ads.

### Which is updated more often, Riichi Compass or MJ DB?

Riichi Compass ships an update every 2 weeks, and MJ DB every 2 days. Most recently, Riichi Compass was updated on May 17, 2026 and MJ DB on September 20, 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.*