Zerko vs boop.
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zerko
A relaxing puzzle game where you strategically place blocks to make all numbers on the board equal zero. Enjoy a no-pressure experience with calming audio and no in-app purchases or ads.
- Zero-sum number puzzles
- Strategic block placement
- Relaxing gameplay
- No time pressure
- No in-app purchases
- No ads
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Some call it reverse sudoku, while others call it a nullification game, but it's Zerko - a puzzle game filled with shapes, numbers, and a straightforward goal: make every number zero. To achieve this, you need to strategically place blocks of various shapes and values so that the numbers on the board effectively "remove up" to zero. Like all my games, this one too is about relaxation... Just chill. There are no points, no time pressure, no data collection, no in-app purchases, no ads, no nonsense ;) My only hope is that you'll enjoy it and that I'll be able to add new content and levels for you in the future. Relaxing audio by: Marek Koszczyński
boop.
A minimalist puzzle game where you slide blocks to reach a goal. Features 50 challenging levels with unique jelly block physics. Offers both light and dark modes that adapt to your device.
- 50 challenging levels
- Jelly block physics
- Light and dark modes
- Slide-to-move gameplay
- Goal-oriented puzzles
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boop. is a minimalist, simple, but challenging puzzle game. slide your block around, bumping into the walls and other blocks to find your way to the goal. - 50 levels that get gradually more challenging as you go - jelly block physics that make swiping and booping fun - light mode and dark mode that changes with your device settings
Screenshots
Verdict
The clearest difference is price: boop. at Free against Zerko's $2.99. boop. also leads on update cadence (every 3 days vs every 3 weeks). Zerko's advantage is in-app purchases (none vs 4) and ads (none vs shown). On rating, review sentiment, ratings volume and device support 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
boop. is free to download; Zerko costs $2.99 up front. boop. sells 4 one-off in-app purchases. Zerko asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Zerko against 5.0 for boop.. Both are backed by a comparable volume of ratings — 14 and 7 respectively. Written reviews are what separate them: 93% of Zerko's written reviews are positive against 100% of boop.'s.
Zerko ships an update every 3 weeks, boop. every 3 days. The most recent releases landed on September 11, 2026 and June 5, 2026 respectively.
| Parameter | Zerko | boop. |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.9 (14 ratings) | 5.0 (7 ratings) — better |
| Positive reviews | 93.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 14 — better | 7 |
| Update frequency | Every 3 weeks | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 100 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Maciej Targoni | Joshua Shadik |
Customer experience
Zerko
boop.
In-app purchases
Zerko
No in-app purchases
boop.
- Expanded Undo$0.99
- 15 Hints$0.99
- 50 Hints$1.99
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- 100 Hints$2.99
