# JongKey vs MJ DB

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

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

JongKey ships an update daily, MJ DB every 2 days. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | JongKey | MJ DB |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 2 days |
| Size | 6 MB | 28 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Takeda](https://appshunter.io/developer/1021096508) | [wilson chung](https://appshunter.io/developer/564506285) |

## What reviewers say

### JongKey

[App page](https://appshunter.io/ios/app/jongkey-mahjong-keyboard/id6748846911)

**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 JongKey free?

JongKey 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 JongKey or MJ DB have ads?

JongKey shows ads; MJ DB does not.

### Which is updated more often, JongKey or MJ DB?

JongKey ships an update daily, and MJ DB every 2 days. Most recently, JongKey was updated on October 11, 2026 and MJ DB on October 7, 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.*