# Graph Theory Book vs Lima DRM

The clearest difference is in-app purchases: Lima DRM at none against Graph Theory Book's 11. Lima DRM also leads on update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Graph Theory Book sells 11 one-off in-app purchases. Lima DRM asks for nothing beyond the download.

Graph Theory Book ships an update every 2 months, Lima DRM every 3 weeks. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Graph Theory Book | Lima DRM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/graph-theory-book/id614583848/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 84 MB |
| Requires iOS | **13.1** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reinhard Diestel](https://appshunter.io/developer/614583971) | [D&L Technology Integration And Consulting Joint Stock Company](https://appshunter.io/developer/1436285979) |

## What reviewers say

### Graph Theory Book

[App page](https://appshunter.io/ios/app/graph-theory-book/id614583848)

Access and read all eBook editions of a comprehensive graph theory textbook. Enjoy high-quality, searchable PDFs with active cross-references. An optional upgrade allows for PDF annotations.

**Highlights:** Downloadable eBook editions, Multiple language support, Searchable PDF format, Active cross-references, Optional PDF annotation upgrade, Read-only eBook

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1. The Basics | $0.99 | one-time |
| 2. Matching, Covering, and Packing | $0.99 | one-time |
| 3. Connectivity | $0.99 | one-time |
| 6. Flows | $0.99 | one-time |
| 9. Ramsey Theory for Graphs | $0.99 | one-time |
| 11. Random Graphs | $0.99 | one-time |
| 12. Minors Trees and WQO | $0.99 | one-time |
| Hints for all the Exercises | $9.99 | one-time |
| Graph Theory | $12.99 | one-time |
| 图论 | $14.99 | one-time |
| English stand-alone pro edition | $32.99 | one-time |


### Lima DRM

[App page](https://appshunter.io/ios/app/lima-drm/id6444889068)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Graph Theory Book free?

Graph Theory Book is free to download, with in-app purchases available.

### Is Lima DRM free?

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

### Do Graph Theory Book or Lima DRM have ads?

Neither Graph Theory Book nor Lima DRM shows ads.

### Which is updated more often, Graph Theory Book or Lima DRM?

Graph Theory Book ships an update every 2 months, and Lima DRM every 3 weeks. Most recently, Graph Theory Book was updated on September 29, 2026 and Lima DRM on October 7, 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.*