# Riddlerr vs Zerko

The clearest difference is price: Riddlerr at Free against Zerko's $2.99. Zerko's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On update cadence, in-app purchases and device support there is nothing between them.

Riddlerr is free to download; Zerko costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on August 4, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Riddlerr | Zerko |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[4.9 (14 ratings)](https://appshunter.io/ios/app/zerko/id6470181559/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | — | 93.3% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Paid |
| Size | 20 MB | 100 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Vladyslav Yermakov](https://appshunter.io/developer/1659418110) | [Maciej Targoni](https://appshunter.io/developer/495165602) |

## What reviewers say

### Riddlerr

[App page](https://appshunter.io/ios/app/riddlerr/id1659418108)

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

**In-app purchases:** none


### Zerko

[App page](https://appshunter.io/ios/app/zerko/id6470181559)

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.

**Highlights:** Zero-sum number puzzles, Strategic block placement, Relaxing gameplay, No time pressure, No in-app purchases, No ads

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

**In-app purchases:** none


## Frequently asked questions

### Is Riddlerr free?

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

### Is Zerko free?

Zerko costs $2.99, with no in-app purchases.

### Do Riddlerr or Zerko have ads?

Riddlerr shows ads; Zerko does not.

### Which is updated more often, Riddlerr or Zerko?

Riddlerr ships an update every 3 weeks, and Zerko every 3 weeks. Most recently, Riddlerr was updated on August 4, 2026 and Zerko on September 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*