# Brain Boost vs Open Book AI Chat

The clearest difference is ads: Open Book AI Chat at none against Brain Boost's shown. Open Book AI Chat also leads on rating (5.0 vs 4.8) and device support (5 vs 2). Brain Boost's advantage is update cadence (every 10 days vs every 2 months). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. Brain Boost sells 5 in-app purchases, starting at $2.99 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 — 4 and 2 respectively.

Brain Boost ships an update every 10 days, Open Book AI Chat every 2 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Brain Boost | Open Book AI Chat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/brain-boost-ai-chatbot/id1666176202/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/open-book-ai-chat/id6446209620/reviews)** |
| Number of ratings | **4** | 2 |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 38 MB | 54 MB |
| Requires iOS | **16.0** | 16.2 |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Mac, Apple TV, Apple Watch** |
| Age rating | 4+ | 9+ |
| Developer | [MobiGlance](https://appshunter.io/developer/484122622) | [Cat Bakery, LLC](https://appshunter.io/developer/1188110325) |

## What reviewers say

### Brain Boost

[App page](https://appshunter.io/ios/app/brain-boost-ai-chatbot/id1666176202)

This AI-powered productivity tool offers a suite of prompts and templates to help users generate content, brainstorm ideas, and streamline tasks. It features AI chat capabilities for instant feedback and inspiration, assisting with everything from writing letters to scripting videos.

**Highlights:** AI-powered prompts and templates, Content generation for letters and videos, AI chat for brainstorming, Writer's block assistance, Idea generation, Task completion assistance

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Weekly | $5.99 | per 7 days |
| Premium Monthly | $7.99 | per month |
| Premium Monthly | $14.99 | per month |
| Premium Annual | $49.99 | 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 Brain Boost free?

Brain Boost 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, Brain Boost or Open Book AI Chat?

Open Book AI Chat is rated higher. Brain Boost averages 4.8 out of 5 from 4 ratings, while Open Book AI Chat averages 5.0 from 2 ratings.

### Do Brain Boost or Open Book AI Chat have ads?

Brain Boost shows ads; Open Book AI Chat does not.

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

Brain Boost ships an update every 10 days, and Open Book AI Chat every 2 months. Most recently, Brain Boost was updated on October 24, 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.*