JongKey vs MJ DB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JongKey
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JongKey is a custom keyboard app that makes it easy to input mahjong tiles. Perfect for recording mahjong games, "What to discard?" discussions, and sharing on social media - making mahjong communication more enjoyable and convenient! 【Key Features】 • Easy input for all 34 types of mahjong tiles and tile backs • Supports two output formats: Unicode emoji and MPS notation • Quick input with intuitive tap operations • Supports Japanese, English, and Chinese (Simplified & Traditional) 【How to Use】 1. Add "JongKey" to keyboards in Settings app 2. Switch keyboards by tapping the globe icon in messaging apps 3. Tap mahjong tiles to input 【Output Formats】 • Unicode: Mahjong tile characters (displayed as emoji) • MPS notation: E S W N, 1m 2m 3m etc. (displayed as text) ※Full Access not required. Your input is not transmitted externally.
MJ DB
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## Game Records - Record scores for each round: Real-time game trend charts - Detailed statistical analysis: Displays historical win rates and fan point distribution trends - Supports modifying/deleting past records, no fear of marking mistakes - Local Connection: Real-time sharing to other local devices, everyone can see - Displays modification and deletion logs for fairness and transparency ## Quick Start - Free, no intrusive ads - Completely offline, simple and easy to use - One-click to join previous players - Record scores with drag and drop of players - Handy tools: Seat shuffling, dice rolling, final settlement (supports grouping two people together for split payments) - Preset and customizable fan point tables, supports Jackpot gameplay ## UIUX - Traditional Chinese and English interface - Supports Dark Mode - Supports iPhone and iPad
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | JongKey | MJ DB |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily — better | Every 2 days |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 6 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuki Takeda | wilson chung |
In-app purchases
JongKey
No in-app purchases
MJ DB
- Remove Ads$0.99









