# DriveThruRPG Library vs Cthulhu Tracker

The clearest difference is in-app purchases: DriveThruRPG Library at none against Cthulhu Tracker's 1. DriveThruRPG Library also leads on iOS requirement (14.5 vs 16.4). Cthulhu Tracker's advantage is update cadence (every 2 days vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Cthulhu Tracker sells 1 one-off in-app purchase. DriveThruRPG Library asks for nothing beyond the download.

DriveThruRPG Library ships an update every 9 months, Cthulhu Tracker every 2 days. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | DriveThruRPG Library | Cthulhu Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (31 ratings)](https://appshunter.io/ios/app/drivethrurpg-library/id1425976251/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 29.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 49 MB | 159 MB |
| Requires iOS | **14.5** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [OneBookShelf, Inc.](https://appshunter.io/developer/442207598) | [Fabio Comelli](https://appshunter.io/developer/1469973595) |

## What reviewers say

### DriveThruRPG Library

[App page](https://appshunter.io/ios/app/drivethrurpg-library/id1425976251)

Easily sync and organize your entire collection of RPG files on your mobile device. Keep your digital library updated automatically and access any file with your preferred viewer. Access purchases from various OneBookShelf sites.

**Highlights:** Sync entire library to device, Organize by publisher/rule system, Custom collection organization, Automatic file updates, Open files in favorite viewer, Access OneBookShelf purchases

**Features:** macOS Compatibility

**In-app purchases:** none


### Cthulhu Tracker

[App page](https://appshunter.io/ios/app/cthulhu-tracker/id6800874026)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Modalita Custode a Vita | $4.99 | one-time |


## Frequently asked questions

### Is DriveThruRPG Library free?

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

### Is Cthulhu Tracker free?

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

### Do DriveThruRPG Library or Cthulhu Tracker have ads?

Neither DriveThruRPG Library nor Cthulhu Tracker shows ads.

### Which is updated more often, DriveThruRPG Library or Cthulhu Tracker?

DriveThruRPG Library ships an update every 9 months, and Cthulhu Tracker every 2 days. Most recently, DriveThruRPG Library was updated on October 23, 2026 and Cthulhu Tracker 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.*