# Amethyst Authenticator vs Bookworm

The clearest difference is update cadence: Amethyst Authenticator at every 3 days against Bookworm's every 5 weeks. Bookworm's advantage is iOS requirement (15.0 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Amethyst Authenticator ships an update every 3 days, Bookworm every 5 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Amethyst Authenticator | Bookworm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 weeks |
| Size | 3 MB | 36 MB |
| Requires iOS | 18.2 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mia Lina Koring](https://appshunter.io/developer/1752380606) | [Edward Chung](https://appshunter.io/developer/1822797262) |

## What reviewers say

### Amethyst Authenticator

[App page](https://appshunter.io/ios/app/amethyst-authenticator/id6743655651)

**In-app purchases:** none


### Bookworm

[App page](https://appshunter.io/ios/app/bookworm-read-with-friends/id6760362779)

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

**In-app purchases:** none


## Frequently asked questions

### Is Amethyst Authenticator free?

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

### Is Bookworm free?

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

### Do Amethyst Authenticator or Bookworm have ads?

Neither Amethyst Authenticator nor Bookworm shows ads.

### Which is updated more often, Amethyst Authenticator or Bookworm?

Amethyst Authenticator ships an update every 3 days, and Bookworm every 5 weeks. Most recently, Amethyst Authenticator was updated on October 28, 2026 and Bookworm on October 25, 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.*