# Chromatic Gem vs 21

The clearest difference is ads: Chromatic Gem at none against 21's shown. 21's advantage is update cadence (every 2 days vs every 30 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Chromatic Gem ships an update every 30 months, 21 every 2 days. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Chromatic Gem | 21 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 30 months | **Every 2 days** |
| Size | 7 MB | 39 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [灿标 朱](https://appshunter.io/developer/1246437769) | [Chee Hoong Khor](https://appshunter.io/developer/1880679655) |

## What reviewers say

### Chromatic Gem

[App page](https://appshunter.io/ios/app/chromatic-gem/id1546827265)

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

**In-app purchases:** none


### 21

[App page](https://appshunter.io/ios/app/21-twenty-one/id6759793279)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chromatic Gem free?

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

### Is 21 free?

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

### Do Chromatic Gem or 21 have ads?

21 shows ads; Chromatic Gem does not.

### Which is updated more often, Chromatic Gem or 21?

Chromatic Gem ships an update every 30 months, and 21 every 2 days. Most recently, Chromatic Gem was updated on November 3, 2026 and 21 on November 9, 2026.

---

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