# Flat Cube vs Kromium

The clearest difference is in-app purchases: Kromium at none against Flat Cube's 1. Kromium also leads on ads (none vs shown). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Flat Cube sells 1 one-off in-app purchase. Kromium asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Flat Cube against 5.0 for Kromium. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Flat Cube ships an update every 3 days, Kromium every 2 days. The most recent releases landed on September 7, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Flat Cube | Kromium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/flat-cube-2d-brain-cube/id6739634625/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/kromium/id6747734910/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 161 MB | 47 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Redev Inc.](https://appshunter.io/developer/1658921539) | [james gibbens](https://appshunter.io/developer/1820693723) |

## What reviewers say

### Flat Cube

[App page](https://appshunter.io/ios/app/flat-cube-2d-brain-cube/id6739634625)

This 2D puzzle game challenges players to strategically slide colored tiles to match designated areas. It offers multiple difficulty levels and daily challenges, encouraging players to optimize their moves and improve cognitive skills.

**Highlights:** Intuitive 2D cube puzzle gameplay, Four colored tiles with a locking system, Slide optimization challenges, Five difficulty levels (4x4 to 12x12), Daily cube challenges, Achievements and badge system, Improves spatial awareness and cognitive skills

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Premium | $9.99 | one-time |


### Kromium

[App page](https://appshunter.io/ios/app/kromium/id6747734910)

Experience a satisfying color puzzle game with intuitive drag-and-drop mechanics and mesmerizing flood-fill animations. Complete hundreds of handcrafted levels with progressive difficulty, designed for both quick breaks and extended play.

**Highlights:** Intuitive drag-and-drop gameplay, Mesmerizing flood-fill mechanics, Hundreds of handcrafted levels, Progressive difficulty modes, Offline play, Star rating system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Flat Cube free?

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

### Is Kromium free?

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

### Which has better reviews, Flat Cube or Kromium?

Flat Cube and Kromium are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do Flat Cube or Kromium have ads?

Flat Cube shows ads; Kromium does not.

### Which is updated more often, Flat Cube or Kromium?

Flat Cube ships an update every 3 days, and Kromium every 2 days. Most recently, Flat Cube was updated on September 7, 2026 and Kromium 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.*