# Write A Book vs Anomaly OS

The clearest difference is in-app purchases: Anomaly OS at none against Write A Book's 3. Anomaly OS also leads on iOS requirement (16.6 vs 26.1). Write A Book's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Write A Book sells 3 in-app purchases, starting at $3.99 per month. Anomaly OS asks for nothing beyond the download.

Write A Book ships an update every 5 days, Anomaly OS fortnightly. The most recent releases landed on October 24, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Write A Book | Anomaly OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/write-a-book-inkrun/id6753130654/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Monetization | Freemium | — |
| Size | 17 MB | 306 MB |
| Requires iOS | 26.1 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Otter Ridge Software, LLC](https://appshunter.io/developer/1825462213) | [Alikhan Surani](https://appshunter.io/developer/1845222814) |

## What reviewers say

### Write A Book

[App page](https://appshunter.io/ios/app/write-a-book-inkrun/id6753130654)

This app helps writers track their word count, set goals, and build consistent writing habits. It offers a focus timer and data visualizations to motivate progress, with an optional subscription for advanced features like home screen widgets and unlimited projects.

**Highlights:** Word count tracking, Writing focus timer, Habit tracker, Goal setting, Data visualizations, Unlimited projects (Pro)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Inkrun Pro Monthly | $3.99 | per month |
| Inkrun Pro Annual | $19.99 | per year |
| Inkrun Pro Lifetime | $29.99 | one-time |


### Anomaly OS

[App page](https://appshunter.io/ios/app/anomaly-os/id6753836945)

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

**In-app purchases:** none


## Frequently asked questions

### Is Write A Book free?

Write A Book is free to download, with in-app purchases available.

### Is Anomaly OS free?

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

### Do Write A Book or Anomaly OS have ads?

Neither Write A Book nor Anomaly OS shows ads.

### Which is updated more often, Write A Book or Anomaly OS?

Write A Book ships an update every 5 days, and Anomaly OS fortnightly. Most recently, Write A Book was updated on October 24, 2026 and Anomaly OS on October 2, 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.*