# 4Kolors vs Stack Fill

The clearest difference is ads: 4Kolors at none against Stack Fill's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 4Kolors | Stack Fill |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 days | Every 3 days |
| Size | 33 MB | 104 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Le Huu Nghia](https://appshunter.io/developer/1073285125) | [Huseyin Bener Bozkurt](https://appshunter.io/developer/1503888821) |

## What reviewers say

### 4Kolors

[App page](https://appshunter.io/ios/app/4kolors/id6443696605)

**Features:** macOS Compatibility

**In-app purchases:** none


### Stack Fill

[App page](https://appshunter.io/ios/app/stack-fill/id6741890183)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 4Kolors free?

4Kolors is free to download, with no in-app purchases.

### Is Stack Fill free?

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

### Do 4Kolors or Stack Fill have ads?

Stack Fill shows ads; 4Kolors does not.

### Which is updated more often, 4Kolors or Stack Fill?

4Kolors ships an update every 3 days, and Stack Fill every 3 days. Most recently, 4Kolors was updated on September 29, 2026 and Stack Fill on October 1, 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.*