# K2Sonnet vs Skill Atlas

The clearest difference is ads: K2Sonnet at none against Skill Atlas's shown. Skill Atlas's advantage is update cadence (every 2 days vs every 7 months) and iOS requirement (13.0 vs 17.6). On price, 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.

K2Sonnet ships an update every 7 months, Skill Atlas every 2 days. The most recent releases landed on September 15, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | K2Sonnet | Skill Atlas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 days** |
| Size | 2 MB | 59 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 9+ |
| Developer | [Shanghai Jiyue Information Technology Co., Ltd.](https://appshunter.io/developer/1795192424) | [CHARLES BERT BURKEEN](https://appshunter.io/developer/1864314414) |

## What reviewers say

### K2Sonnet

[App page](https://appshunter.io/ios/app/k2sonnet/id6753734747)

**Features:** macOS Compatibility

**In-app purchases:** none


### Skill Atlas

[App page](https://appshunter.io/ios/app/skill-atlas/id6759538293)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is K2Sonnet free?

K2Sonnet is free to download, with no in-app purchases.

### Is Skill Atlas free?

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

### Do K2Sonnet or Skill Atlas have ads?

Skill Atlas shows ads; K2Sonnet does not.

### Which is updated more often, K2Sonnet or Skill Atlas?

K2Sonnet ships an update every 7 months, and Skill Atlas every 2 days. Most recently, K2Sonnet was updated on September 15, 2026 and Skill Atlas on September 12, 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.*