# K2Sonnet vs Kess

The clearest difference is in-app purchases: K2Sonnet at none against Kess's 12. K2Sonnet also leads on iOS requirement (17.6 vs 26.0). Kess's advantage is update cadence (every 4 days vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Kess sells 12 in-app purchases, starting at $14.99 per month. K2Sonnet asks for nothing beyond the download.

K2Sonnet ships an update every 7 months, Kess every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | K2Sonnet | Kess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/k2sonnet/id6753734747/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 days** |
| Size | 2 MB | 14 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Shanghai Jiyue Information Technology Co., Ltd.](https://appshunter.io/developer/1795192424) | [Kessway Technologies Inc.](https://appshunter.io/developer/6808241045) |

## What reviewers say

### K2Sonnet

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Kess

[App page](https://appshunter.io/ios/app/kess-assistant-not-a-bot/id6808241043)

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kess Pro Monthly | $14.99 | per month |
| Kess Pro Monthly | $14.99 | per month |
| Kess Pro Together Monthly | $22.99 | per month |
| Kess Realtor | $69.99 | per month |
| Kess Pro Yearly | $99.99 | per year |
| Kess Pro Yearly | $99.99 | per year |
| Kess Pro Together Yearly | $149.99 | per year |
| Rowan, your coach | $219.99 | per month |
| 100 more spoken replies | $5.99 | one-time |
| 200 more messages | $6.99 | one-time |
| 30 more call minutes | $9.99 | one-time |
| Feedback on 10 more showings | $9.99 | one-time |


## Frequently asked questions

### Is K2Sonnet free?

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

### Is Kess free?

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

### Do K2Sonnet or Kess have ads?

Neither K2Sonnet nor Kess shows ads.

### Which is updated more often, K2Sonnet or Kess?

K2Sonnet ships an update every 7 months, and Kess every 4 days. Most recently, K2Sonnet was updated on October 24, 2026 and Kess on October 24, 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.*