# Undersea Mahjong vs DeckKeeper

The clearest difference is update cadence: DeckKeeper at every 3 weeks against Undersea Mahjong's every 3 months. Undersea Mahjong's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Undersea Mahjong sells 6 one-off in-app purchases and DeckKeeper sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Undersea Mahjong ships an update every 3 months, DeckKeeper every 3 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Undersea Mahjong | DeckKeeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/undersea-mahjong/id748612885/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 10 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Code This Lab srl](https://appshunter.io/developer/377003842) | [Pavel Yashin](https://appshunter.io/developer/1597079751) |

## What reviewers say

### Undersea Mahjong

[App page](https://appshunter.io/ios/app/undersea-mahjong/id748612885)

A classic matching puzzle game where you clear the board by pairing identical tiles. Explore various themes and unlock new game modes to keep the challenge fresh. Compete with others through leaderboards and achievements.

**Highlights:** Classic Mahjong matching gameplay, Multiple game modes including Memory, Over 30 themed layouts, Three difficulty levels, Multi-language support, Leaderboards and achievements

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| New 7 Wonders Layout | $0.99 | one-time |
| Disable Ads | $0.99 | one-time |
| Six New Layouts | $0.99 | one-time |
| New Six Winter Layout | $0.99 | one-time |
| Coins Pack | $1.99 | one-time |
| 100 coins, disable Ads, your name in the credits! | $2.99 | one-time |


### DeckKeeper

[App page](https://appshunter.io/ios/app/deckkeeper/id6456039757)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove limits | $2.99 | one-time |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Undersea Mahjong free?

Undersea Mahjong is free to download, with in-app purchases available.

### Is DeckKeeper free?

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

### Do Undersea Mahjong or DeckKeeper have ads?

Both Undersea Mahjong and DeckKeeper show ads.

### Which is updated more often, Undersea Mahjong or DeckKeeper?

Undersea Mahjong ships an update every 3 months, and DeckKeeper every 3 weeks. Most recently, Undersea Mahjong was updated on October 26, 2026 and DeckKeeper on October 27, 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.*