# AA Big Book e vs Fourth Step Inventory

The clearest difference is in-app purchases: Fourth Step Inventory at none against AA Big Book e's 3. AA Big Book e's advantage is update cadence (weekly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AA Big Book e sells 3 in-app purchases, starting at $4.99 per month. Fourth Step Inventory asks for nothing beyond the download.

AA Big Book e ships an update weekly, Fourth Step Inventory every 4 months. The most recent releases landed on September 17, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | AA Big Book e | Fourth Step Inventory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (20 ratings)](https://appshunter.io/ios/app/aa-big-book-e-reader-plus-audio/id6448790511/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 2 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Tushar Bhagat](https://appshunter.io/developer/901932809) | [STEVEN MARC GORLIN](https://appshunter.io/developer/1867594003) |

## What reviewers say

### AA Big Book e

[App page](https://appshunter.io/ios/app/aa-big-book-e-reader-plus-audio/id6448790511)

This app provides a digital version of the AA Big Book, allowing users to read, listen to the audio version, and take notes. It features highlighting, bookmarking, search functionality, and a sobriety calculator to support recovery.

**Highlights:** Highlight and color-code text, Take notes and reflections, Bookmark and quick access, Powerful search functionality, Full text of the Big Book, Audio playback, Sobriety calculator

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Quarterly Subscription | $9.99 | per 3 months |
| Annual Subscription | $29.99 | per year |


### Fourth Step Inventory

[App page](https://appshunter.io/ios/app/fourth-step-inventory/id6757550299)

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

**In-app purchases:** none


## Frequently asked questions

### Is AA Big Book e free?

AA Big Book e is free to download, with in-app purchases available.

### Is Fourth Step Inventory free?

Fourth Step Inventory is free to download, with no in-app purchases.

### Do AA Big Book e or Fourth Step Inventory have ads?

Neither AA Big Book e nor Fourth Step Inventory shows ads.

### Which is updated more often, AA Big Book e or Fourth Step Inventory?

AA Big Book e ships an update weekly, and Fourth Step Inventory every 4 months. Most recently, AA Big Book e was updated on September 17, 2026 and Fourth Step Inventory on September 14, 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.*