SynthStack vs Sternzy
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
SynthStack
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.
- Neon-lit cyberpunk world
- Stack and align vibrant shapes
- Retro-futuristic visuals
- Immersive soundscapes
- Strategy and reflex challenges
- High score chasing
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SynthStack is a thrilling puzzle game that transports you into a neon-lit, cyberpunk world inspired by synthwave aesthetics. Your mission is to stack and align vibrant shapes, clearing levels while enjoying dynamic gameplay. With its retro-futuristic visuals and immersive soundscapes, SynthStack challenges your strategy and reflexes. Whether you're chasing high scores or perfecting your skills, this game offers endless entertainment in a visually stunning environment. Download SynthStack now and dive into the future of puzzle gaming!
Sternzy
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.
- 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
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Water Sort: Cat Puzzle is a relaxing color-sorting puzzle with a cozy feline twist. Pour the colored liquid from tube to tube until each one holds a single color — easy to learn, satisfying to master, and just tricky enough to keep your brain happy. Every tube is a sleepy cat waiting to be sorted. Fill it with four matching colors and it gives you a happy little wink. FEATURES • Endless, ever-harder levels — from a gentle warm-up to genuinely brain-bending • Calm, satisfying pour-and-sort gameplay you can play one-handed • A playful cat theme with cheerful encouragement as you go • Special level twists to keep things fresh: hidden colors, mystery tubes, bombs, frozen vials, color swaps and more • Earn credits through daily rewards and play, then spend them on hints and extra vials when you're stuck • Undo your moves or remix a board anytime — no timers, no pressure • Game Center leaderboards (Highest Level, Total Stars) and achievements to chase • Color-blind friendly display options • Play offline, anywhere Made with love by one indie developer. If you enjoy it, the in-app Tip Jar is a kind way to support more updates — and you'll get bonus credits as a thank-you. No ads. Just you, the colors, and a few very patient cats.
Screenshots
Verdict
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.
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. 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.
| Parameter | SynthStack | Sternzy |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 days | Every 2 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 22 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Nurullah Macun | David Stern |
Customer experience
SynthStack
Sternzy
In-app purchases
SynthStack
- Remove ads$2.99
Sternzy
- 4 Credits$0.99
- $1 Coffee Tip$0.99
- $2 Coffee Tip$1.99
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- 28 Credits$3.99
- $5 Coffee Tip$4.99
- $10 Coffee Tip$9.99









