# SynthStack vs Sternzy

The clearest difference is ads: Sternzy at none against SynthStack's shown. SynthStack's advantage is iOS requirement (15.6 vs 26.0). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. SynthStack sells 1 one-off in-app purchase and Sternzy sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for SynthStack against 5.0 for Sternzy. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SynthStack | Sternzy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/synthstack-block-puzzle-game/id6504832555/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sternzy-water-sort/id6775494205/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 days | Every 2 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 22 MB | 10 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nurullah Macun](https://appshunter.io/developer/1754005758) | [David Stern](https://appshunter.io/developer/6771868079) |

## What reviewers say

### SynthStack

[App page](https://appshunter.io/ios/app/synthstack-block-puzzle-game/id6504832555)

A neon-lit puzzle game set in a cyberpunk world. Stack and align vibrant shapes to clear levels, challenging your strategy and reflexes with retro-futuristic visuals and immersive soundscapes.

**Highlights:** Neon-lit cyberpunk world, Stack and align vibrant shapes, Retro-futuristic visuals, Immersive soundscapes, Strategy and reflex challenges, High score chasing

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $2.99 | one-time |


### Sternzy

[App page](https://appshunter.io/ios/app/sternzy-water-sort/id6775494205)

A relaxing color-sorting puzzle game featuring cute cats. Pour colored liquids between tubes until each tube contains a single color. Enjoy endless, challenging levels with special twists and a playful feline theme.

**Highlights:** Endless, ever-harder levels, Calm, satisfying one-handed gameplay, Playful cat theme, Special level twists, Earn credits for hints, No timers or pressure, Offline play

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4 Credits | $0.99 | one-time |
| $1 Coffee Tip | $0.99 | one-time |
| $2 Coffee Tip | $1.99 | one-time |
| 28 Credits | $3.99 | one-time |
| $5 Coffee Tip | $4.99 | one-time |
| $10 Coffee Tip | $9.99 | one-time |


## Frequently asked questions

### Is SynthStack free?

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

### Is Sternzy free?

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

### Which has better reviews, SynthStack or Sternzy?

SynthStack and Sternzy are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SynthStack or Sternzy have ads?

SynthStack shows ads; Sternzy does not.

### Which is updated more often, SynthStack or Sternzy?

SynthStack ships an update every 2 days, and Sternzy every 2 days. Most recently, SynthStack was updated on October 16, 2026 and Sternzy 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.*