# Water Valves vs Sky Stack

The clearest difference is rating: Sky Stack at 5.0 against Water Valves's 1.0. Sky Stack also leads on update cadence (every 3 days vs every 9 days). Water Valves's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, ads 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.

Sky Stack holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Water Valves ships an update every 9 days, Sky Stack every 3 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Water Valves | Sky Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/water-valves-sort-puzzle-game/id6741197663/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sky-stack-tower-builder/id6761363764/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | Ad-supported | Ad-supported |
| Size | 71 MB | 104 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Lystn](https://appshunter.io/developer/1586089517) | [Mehmet Resat Senel](https://appshunter.io/developer/1867533935) |

## What reviewers say

### Water Valves

[App page](https://appshunter.io/ios/app/water-valves-sort-puzzle-game/id6741197663)

Untangle wrenches and shut off leaking water pipes in this strategy puzzle game. Plan your moves carefully to solve intricate pipe systems and prevent a flood. Master logic and precision to overcome increasingly difficult challenges.

**Highlights:** Untangle wrenches, Shut off water pipes, Solve intricate puzzles, Plan moves carefully, Logic and precision challenges, Unlock harder stages

**Features:** macOS Compatibility

**In-app purchases:** none


### Sky Stack

[App page](https://appshunter.io/ios/app/sky-stack-tower-builder/id6761363764)

Stack falling blocks to construct the highest possible tower. Carefully move, rotate, and drop each piece to maintain balance. A single misstep can cause your creation to tumble.

**Highlights:** Physics-based stacking, Endless tower building, Intuitive controls, Stabilizer platforms, Limited fails, Global leaderboard, Ad-supported continues

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

**In-app purchases:** none


## Frequently asked questions

### Is Water Valves free?

Water Valves is free to download, with no in-app purchases.

### Is Sky Stack free?

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

### Which has better reviews, Water Valves or Sky Stack?

Sky Stack is rated higher. Water Valves averages 1.0 out of 5 from 1 ratings, while Sky Stack averages 5.0 from 1 ratings.

### Do Water Valves or Sky Stack have ads?

Both Water Valves and Sky Stack show ads.

### Which is updated more often, Water Valves or Sky Stack?

Water Valves ships an update every 9 days, and Sky Stack every 3 days. Most recently, Water Valves was updated on October 28, 2026 and Sky Stack 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.*