# World History Documents vs Serial Killer Murder Library

The clearest difference is price: World History Documents at Free against Serial Killer Murder Library's $3.99. Serial Killer Murder Library's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 11 months). On review sentiment, ads and device support there is nothing between them.

World History Documents is free to download; Serial Killer Murder Library costs $3.99 up front. World History Documents sells 1 one-off in-app purchase. Serial Killer Murder Library asks for nothing beyond the download.

World History Documents ships an update every 11 months, Serial Killer Murder Library every 3 months. The most recent releases landed on October 23, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | World History Documents | Serial Killer Murder Library |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[4.0 (6 ratings)](https://appshunter.io/ios/app/serial-killer-murder-library/id493094117/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **66.7% of reviews** | 60.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 109 MB | 22 MB |
| Requires iOS | 17.0 | **7.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Rocket Splash Games](https://appshunter.io/developer/471267937) |

## What reviewers say

### World History Documents

[App page](https://appshunter.io/ios/app/world-history-documents/id367927768)

Access a vast collection of 350 primary source documents and speeches spanning world history. Explore historical texts, including religious scriptures and famous addresses, with explanations of their significance. Save, email, and search documents easily.

**Highlights:** 350+ primary source documents, 19 audio/video recordings, Categorized by time period, Dedicated sections for regions/topics, Full text search functionality, Save to favorites, Email documents

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full World History | $1.99 | one-time |


### Serial Killer Murder Library

[App page](https://appshunter.io/ios/app/serial-killer-murder-library/id493094117)

Explore a vast collection of information on over 600 serial killers from around the world. Discover their stories, victims, and associated films and TV shows. The app allows sorting by various criteria and sharing content.

**Highlights:** Over 600 serial killers, Information from 50 countries, Over 175 film and TV references, Sort by victims, gender, country, nickname, Share news and content, Browse offline (for killer data)

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

**In-app purchases:** none


## Frequently asked questions

### Is World History Documents free?

World History Documents is free to download, with in-app purchases available.

### Is Serial Killer Murder Library free?

Serial Killer Murder Library costs $3.99, with no in-app purchases.

### Do World History Documents or Serial Killer Murder Library have ads?

Neither World History Documents nor Serial Killer Murder Library shows ads.

### Which is updated more often, World History Documents or Serial Killer Murder Library?

World History Documents ships an update every 11 months, and Serial Killer Murder Library every 3 months. Most recently, World History Documents was updated on October 23, 2026 and Serial Killer Murder Library on October 12, 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.*