# K2Sonnet vs HeyAI!

The clearest difference is update cadence: HeyAI! at every 3 days against K2Sonnet's every 7 months. On price, ads, 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, HeyAI! every 3 days. The most recent releases landed on September 15, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | K2Sonnet | HeyAI! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 days** |
| Size | 2 MB | 9 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 9+ |
| Developer | [Shanghai Jiyue Information Technology Co., Ltd.](https://appshunter.io/developer/1795192424) | [Operationrange LTD](https://appshunter.io/developer/1848836352) |

## What reviewers say

### K2Sonnet

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

**Features:** macOS Compatibility

**In-app purchases:** none


### HeyAI!

[App page](https://appshunter.io/ios/app/heyai/id6754555357)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is K2Sonnet free?

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

### Is HeyAI! free?

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

### Do K2Sonnet or HeyAI! have ads?

Neither K2Sonnet nor HeyAI! shows ads.

### Which is updated more often, K2Sonnet or HeyAI!?

K2Sonnet ships an update every 7 months, and HeyAI! every 3 days. Most recently, K2Sonnet was updated on September 15, 2026 and HeyAI! on September 10, 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.*