# BookGPT vs HammerAI

The clearest difference is in-app purchases: BookGPT at none against HammerAI's 10. HammerAI's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. HammerAI sells 10 in-app purchases, starting at $4.99 per 7 days. BookGPT asks for nothing beyond the download.

## The numbers

| Metric | BookGPT | HammerAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.2 (21 ratings)](https://appshunter.io/ios/app/hammerai/id6770699376/reviews)** |
| Number of ratings | — | **21** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 11 MB | 33 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Maxim Sidorov](https://appshunter.io/developer/1643324508) | [HammerAI](https://appshunter.io/developer/1896761542) |

## What reviewers say

### BookGPT

[App page](https://appshunter.io/ios/app/bookgpt/id6759470298)

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

**In-app purchases:** none


### HammerAI

[App page](https://appshunter.io/ios/app/hammerai/id6770699376)

Engage in immersive roleplay with thousands of AI characters, create your own stories, and generate unique images. This app prioritizes user privacy by allowing local storage of chats and characters, with no ads or tracking.

**Highlights:** Thousands of AI characters, AI roleplay and character chat, Group chats with multiple AIs, Co-author stories with AI, AI image generation, Text-to-speech with 300+ voices, Local chat and character storage

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Weekly | $4.99 | per 7 days |
| Ultimate Weekly | $9.99 | per 7 days |
| Advanced Monthly | $17.99 | per month |
| Starter Quarterly | $23.99 | per 3 months |
| Ultimate Monthly | $34.99 | per month |
| Advanced Quarterly | $47.99 | per 3 months |
| Starter Yearly | $84.99 | per year |
| Ultimate Quarterly | $94.99 | per 3 months |
| Advanced Yearly | $169.99 | per year |
| Ultimate Yearly | $329.99 | per year |


## Frequently asked questions

### Is BookGPT free?

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

### Is HammerAI free?

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

### Do BookGPT or HammerAI have ads?

Neither BookGPT nor HammerAI shows ads.

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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.*