# Prelim360 vs Disaster Diaries

The clearest difference is update cadence: Disaster Diaries at weekly against Prelim360's every 2 months. Disaster Diaries also leads on iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Prelim360 ships an update every 2 months, Disaster Diaries weekly. The most recent releases landed on September 9, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | Prelim360 | Disaster Diaries |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 43 MB | 25 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Alcazar, LLC](https://appshunter.io/developer/1475483623) | [Build SOS Inc](https://appshunter.io/developer/1824295852) |

## What reviewers say

### Prelim360

[App page](https://appshunter.io/ios/app/prelim360/id6745491276)

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

**In-app purchases:** none


### Disaster Diaries

[App page](https://appshunter.io/ios/app/disaster-diaries/id6748095550)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prelim360 free?

Prelim360 is free to download, with no in-app purchases.

### Is Disaster Diaries free?

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

### Do Prelim360 or Disaster Diaries have ads?

Neither Prelim360 nor Disaster Diaries shows ads.

### Which is updated more often, Prelim360 or Disaster Diaries?

Prelim360 ships an update every 2 months, and Disaster Diaries weekly. Most recently, Prelim360 was updated on September 9, 2026 and Disaster Diaries on September 5, 2026.

---

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