# Stack of Mahjong vs Clock Challenge

The clearest difference is ads: Clock Challenge at none against Stack of Mahjong's shown. Clock Challenge also leads on update cadence (fortnightly vs every 49 months) and monetization model (free vs ad-supported). Stack of Mahjong's advantage is iOS requirement (12.0 vs 16.4). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Stack of Mahjong against 5.0 for Clock Challenge. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Stack of Mahjong ships an update every 49 months, Clock Challenge fortnightly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Stack of Mahjong | Clock Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/stack-of-mahjong/id1076843581/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/clock-challenge-stop-at-10/id6800765527/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 49 months | **Fortnightly** |
| Monetization | Ad-supported | **Free** |
| Size | 115 MB | 30 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [mei lien lin](https://appshunter.io/developer/1059593926) | [Travis Moher](https://appshunter.io/developer/1869982110) |

## What reviewers say

### Stack of Mahjong

[App page](https://appshunter.io/ios/app/stack-of-mahjong/id1076843581)

A free matching game where players find and connect identical mahjong tiles to clear the board. Offers various levels, board rotation, zoom, hints, and automatic shuffling for engaging gameplay.

**Highlights:** Identical tile matching, Board rotation and zoom, Hint and shuffle options, Various levels, Simple and attractive rules

**Features:** macOS Compatibility

**In-app purchases:** none


### Clock Challenge

[App page](https://appshunter.io/ios/app/clock-challenge-stop-at-10/id6800765527)

A minimalist game where players aim to stop a timer at precisely 10.000 seconds. With only one attempt per day, players compete for a spot on the leaderboard and build daily streaks. The game emphasizes precision and fairness for all players.

**Highlights:** One daily attempt, Stop timer at 10.000 seconds, Daily leaderboard, Build streaks, Server-checked times, Cross-device sync

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

**In-app purchases:** none


## Frequently asked questions

### Is Stack of Mahjong free?

Stack of Mahjong is free to download, with no in-app purchases.

### Is Clock Challenge free?

Clock Challenge is free to download, with no in-app purchases.

### Which has better reviews, Stack of Mahjong or Clock Challenge?

Stack of Mahjong and Clock Challenge are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do Stack of Mahjong or Clock Challenge have ads?

Stack of Mahjong shows ads; Clock Challenge does not.

### Which is updated more often, Stack of Mahjong or Clock Challenge?

Stack of Mahjong ships an update every 49 months, and Clock Challenge fortnightly. Most recently, Stack of Mahjong was updated on November 2, 2026 and Clock Challenge on October 31, 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.*