# ChatLLM vs K2Sonnet

The clearest difference is rating: ChatLLM at 4.9 against K2Sonnet's 1.0. ChatLLM also leads on update cadence (every 4 days vs every 7 months) and ratings volume (3.8K vs 1). K2Sonnet's advantage is in-app purchases (none vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ChatLLM sells 3 in-app purchases, starting at $9.99 per month. K2Sonnet asks for nothing beyond the download.

ChatLLM holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: ChatLLM has 3.8K ratings behind it against 1, so its average is the more settled of the two.

ChatLLM ships an update every 4 days, K2Sonnet every 7 months. Both last shipped on October 28, 2026.

## The numbers

| Metric | ChatLLM | K2Sonnet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (3.8K ratings)](https://appshunter.io/ios/app/chatllm-ai-chat-bot-and-agent/id6502844681/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/k2sonnet/id6753734747/reviews) |
| Number of ratings | **3.8K** | 1 |
| Positive reviews | 64.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 7 months |
| Monetization | Subscription | **Free** |
| Size | 118 MB | 2 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Abacus.AI](https://appshunter.io/developer/1747006654) | [Shanghai Jiyue Information Technology Co., Ltd.](https://appshunter.io/developer/1795192424) |

## What reviewers say

### ChatLLM

[App page](https://appshunter.io/ios/app/chatllm-ai-chat-bot-and-agent/id6502844681)

Access multiple advanced AI models for chat, content creation, and task automation. Features include an autonomous AI agent, real-time meeting transcription, and voice interaction. Generate images, videos, and code, or analyze documents with this comprehensive AI assistant.

**Highlights:** Autonomous AI agent for complex tasks, Real-time meeting transcription and insights, Multi-model AI chat (GPT-5, Opus, Gemini), Image and video generation, Voice chat with multiple AI voices, AI-powered web research, Code execution and debugging

**Features:** Safari Extension, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $9.99 | per month |
| Monthly subscription | $9.99 | per month |
| Pro Tier | $19.99 | per month |

**What reviewers like**

- 💰 Cheap and powerful
- 🔥 Amazing best on the market by far
- 🔥 Abacus ai - Absolutely fabulous tool great work horse, The best value on the market
- 🔥 The best of AI capabilities into a single, seamless platform!
- 🔥 Super impressive app

**What reviewers complain about**

- 🚫 No account creation
- 📏 Can't adjust font size
- 🚫 Doesn't show routing. Doesn't transcribe audio
- 🐛 Voice chat is not transcribing. I need it. Sometimes I can reenter the thread and it will be there, and then vanish!
- 🚫 Function but ugly and missing clean ui/ux design

**Reported bugs**

- Voice chat is not transcribing
- Chats disappearing after re-entering the thread
- App freezing or becoming laggy when generating responses on mobile
- Voice chat not working
- App crashing on mobile

**Requested features**

- Add transcript to the headphone mode
- Rename a thread
- Add execution time and other metrics for each request
- Indicate which LLM served the request when using routeLLM
- Add an iPad version


### K2Sonnet

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

This next-generation smart assistant helps streamline your daily tasks. It offers intelligent features designed to enhance productivity and organization. Experience a smarter way to manage your workflow.

**Highlights:** Smart assistance, Task management, Workflow enhancement, Intelligent features, Organization tools

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ChatLLM free?

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

### Is K2Sonnet free?

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

### Which has better reviews, ChatLLM or K2Sonnet?

ChatLLM is rated higher. ChatLLM averages 4.9 out of 5 from 3.8K ratings, while K2Sonnet averages 1.0 from 1 ratings.

### Do ChatLLM or K2Sonnet have ads?

Neither ChatLLM nor K2Sonnet shows ads.

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

ChatLLM ships an update every 4 days, and K2Sonnet every 7 months. Most recently, ChatLLM was updated on October 28, 2026 and K2Sonnet on October 28, 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.*