# mChatAI vs Open Book AI Chat

The clearest difference is update cadence: mChatAI at every 2 weeks against Open Book AI Chat's every 2 months. mChatAI also leads on ratings volume (6 vs 2). Open Book AI Chat's advantage is device support (5 vs 3) and iOS requirement (16.2 vs 26.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. mChatAI sells 3 in-app purchases, starting at $0.99 per 7 days and Open Book AI Chat sells 1 in-app purchase, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Open Book AI Chat holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

mChatAI ships an update every 2 weeks, Open Book AI Chat every 2 months. The most recent releases landed on October 28, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | mChatAI | Open Book AI Chat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (6 ratings)](https://appshunter.io/ios/app/mchatai/id6445939409/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/open-book-ai-chat/id6446209620/reviews)** |
| Number of ratings | **6** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 62 MB | 54 MB |
| Requires iOS | 26.0 | **16.2** |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, Mac, Apple TV, Apple Watch** |
| Age rating | 17+ | 9+ |
| Developer | [7HillsStudios](https://appshunter.io/developer/362351361) | [Cat Bakery, LLC](https://appshunter.io/developer/1188110325) |

## What reviewers say

### mChatAI

[App page](https://appshunter.io/ios/app/mchatai/id6445939409)

This AI-powered workspace streamlines daily productivity by offering multi-model chat, AI writing assistance, voice-first conversations, and intelligent task management. Capture ideas, organize projects, and summarize web content efficiently within a single, unified application.

**Highlights:** Multi-model AI chat, AI writing tools, Hands-free voice chat, AI ToDo list management, Web AI summarization, Custom AI assistants, Flexible API key setup

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| mChatAI Weekly Subscription | $0.99 | per 7 days |
| mChatAI Monthly Subscription | $2.99 | per month |
| mChatAI Monthly Subscription | $29.99 | per year |


### Open Book AI Chat

[App page](https://appshunter.io/ios/app/open-book-ai-chat/id6446209620)

This AI chat application leverages advanced natural language processing to enhance communication and productivity. It facilitates efficient interactions with colleagues, clients, and friends for collaboration, business, or personal connections.

**Highlights:** Advanced natural language processing, Streamlined communication, Team collaboration, Client interaction, Personal messaging

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Open Book AI T1 | $3.99 | per 7 days |


## Frequently asked questions

### Is mChatAI free?

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

### Is Open Book AI Chat free?

Open Book AI Chat is free to download, with in-app purchases available.

### Which has better reviews, mChatAI or Open Book AI Chat?

Open Book AI Chat is rated higher. mChatAI averages 4.8 out of 5 from 6 ratings, while Open Book AI Chat averages 5.0 from 2 ratings.

### Do mChatAI or Open Book AI Chat have ads?

Neither mChatAI nor Open Book AI Chat shows ads.

### Which is updated more often, mChatAI or Open Book AI Chat?

mChatAI ships an update every 2 weeks, and Open Book AI Chat every 2 months. Most recently, mChatAI was updated on October 28, 2026 and Open Book AI Chat on October 22, 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.*