# Casebook vs ONE KILLER LEFT

The clearest difference is ads: Casebook at none against ONE KILLER LEFT's shown. ONE KILLER LEFT's advantage is update cadence (every 4 days vs fortnightly) and iOS requirement (15.1 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Casebook sells 1 one-off in-app purchase and ONE KILLER LEFT sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Casebook ships an update fortnightly, ONE KILLER LEFT every 4 days. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Casebook | ONE KILLER LEFT |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 41 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [torankirite](https://appshunter.io/developer/1883564850) | [RICARDO GONZALEZ ESCALERA](https://appshunter.io/developer/6804354567) |

## What reviewers say

### Casebook

[App page](https://appshunter.io/ios/app/casebook-murder-mystery-logic/id6799586995)

Engage your logic skills with generated murder mystery cases. Cross-reference statements to find contradictions and identify the culprit. Offers multiple difficulty levels and themed scenarios without timers or luck-based gameplay.

**Highlights:** Endless generated cases, Four case difficulty levels, Daily unique case, Three themed crime scenes, Detective rank progression, Pencil mode and hints

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | one-time |


### ONE KILLER LEFT

[App page](https://appshunter.io/ios/app/one-killer-left/id6804354565)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5 Discards | $0.99 | one-time |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Casebook free?

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

### Is ONE KILLER LEFT free?

ONE KILLER LEFT is free to download, with in-app purchases available.

### Do Casebook or ONE KILLER LEFT have ads?

ONE KILLER LEFT shows ads; Casebook does not.

### Which is updated more often, Casebook or ONE KILLER LEFT?

Casebook ships an update fortnightly, and ONE KILLER LEFT every 4 days. Most recently, Casebook was updated on October 29, 2026 and ONE KILLER LEFT on October 31, 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.*