# Serial Killer Murder Library vs Overpopulation

The clearest difference is price: Overpopulation at Free against Serial Killer Murder Library's $3.99. Overpopulation also leads on review sentiment (100% vs 61%) and rating (4.5 vs 4.0). Serial Killer Murder Library's advantage is update cadence (every 3 months vs every 7 months) and chart position (#150 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Overpopulation is free to download; Serial Killer Murder Library costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Overpopulation holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Overpopulation has 47 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 61% of Serial Killer Murder Library's written reviews are positive against 100% of Overpopulation's.

Serial Killer Murder Library ships an update every 3 months, Overpopulation every 7 months. The most recent releases landed on October 12, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Serial Killer Murder Library | Overpopulation |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [4.0 (6 ratings)](https://appshunter.io/ios/app/serial-killer-murder-library/id493094117/reviews) | **[4.5 (47 ratings)](https://appshunter.io/ios/app/overpopulation/id939446245/reviews)** |
| Number of ratings | 6 | **47** |
| Positive reviews | 60.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#150** | — |
| Size | 22 MB | 30 MB |
| Requires iOS | **7.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Rocket Splash Games](https://appshunter.io/developer/471267937) | [Jasper Eikelboom](https://appshunter.io/developer/939446244) |

## What reviewers say

### Serial Killer Murder Library

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

**Currently charting:** #150 Top Paid · Reference (US App Store)

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


### Overpopulation

[App page](https://appshunter.io/ios/app/overpopulation/id939446245)

Explore global population dynamics with interactive data on current and future overpopulation scenarios for every country. Understand sustainable population limits based on ecological footprints and biocapacity, and discover humane solutions.

**Highlights:** Interactive population overshoot display, Current and future population scenarios, Sustainable population size calculations, Ecological Footprint and Biocapacity ratios, Humane overpopulation solutions per country

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

**In-app purchases:** none


## Frequently asked questions

### Is Serial Killer Murder Library free?

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

### Is Overpopulation free?

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

### Which has better reviews, Serial Killer Murder Library or Overpopulation?

Overpopulation is rated higher. Serial Killer Murder Library averages 4.0 out of 5 from 6 ratings, while Overpopulation averages 4.5 from 47 ratings.

### Do Serial Killer Murder Library or Overpopulation have ads?

Neither Serial Killer Murder Library nor Overpopulation shows ads.

### Which is updated more often, Serial Killer Murder Library or Overpopulation?

Serial Killer Murder Library ships an update every 3 months, and Overpopulation every 7 months. Most recently, Serial Killer Murder Library was updated on October 12, 2026 and Overpopulation on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*