# Delta Chat vs K9 Chat

The clearest difference is rating: K9 Chat at 5.0 against Delta Chat's 4.5. Delta Chat's advantage is ratings volume (122 vs 1) and iOS requirement (15.6 vs 18.5). On price, update cadence, ads and in-app purchases there is nothing between them.

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

K9 Chat holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Delta Chat has 122 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 24, 2026 and July 21, 2026 respectively.

## The numbers

| Metric | Delta Chat | K9 Chat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (122 ratings)](https://appshunter.io/ios/app/delta-chat/id1459523234/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/k9-chat/id1603886124/reviews)** |
| Number of ratings | **122** | 1 |
| Positive reviews | 61.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | Free |
| Size | 60 MB | 250 MB |
| Requires iOS | **15.6** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [merlinux](https://appshunter.io/developer/1459523233) | [Colohost LLC](https://appshunter.io/developer/1582364323) |

## What reviewers say

### Delta Chat

[App page](https://appshunter.io/ios/app/delta-chat/id1459523234)

This decentralized messenger offers private, secure, and reliable instant messaging. It allows for easy setup on multiple devices and supports multiple chat profiles without requiring a phone number. Enjoy end-to-end encryption and the flexibility to run it with your own email or server.

**Highlights:** Decentralized instant messaging, Private onboarding without phone number, End-to-end encryption, Multiple chat profiles, Works on multiple devices, Self-hosted option

**Features:** Vision Pro support

**In-app purchases:** none


### K9 Chat

[App page](https://appshunter.io/ios/app/k9-chat/id1603886124)

This secure chat application offers end-to-end encryption and zero-trust communication for private teams and organizations. It supports audio, video, screensharing, and voice notes without tracking user activity. Access requires an account provided by an administrator.

**Highlights:** End-to-end encryption, Zero-trust communication, Anonymous messaging, Audio and video calls, Screensharing, Voice notes

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

**In-app purchases:** none


## Frequently asked questions

### Is Delta Chat free?

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

### Is K9 Chat free?

K9 Chat is free to download, with no in-app purchases.

### Which has better reviews, Delta Chat or K9 Chat?

K9 Chat is rated higher. Delta Chat averages 4.5 out of 5 from 122 ratings, while K9 Chat averages 5.0 from 1 ratings.

### Do Delta Chat or K9 Chat have ads?

Neither Delta Chat nor K9 Chat shows ads.

### Which is updated more often, Delta Chat or K9 Chat?

Delta Chat ships an update every 3 weeks, and K9 Chat every 3 weeks. Most recently, Delta Chat was updated on September 24, 2026 and K9 Chat on July 21, 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.*