# InstaSOS vs Cairn Maps

The clearest difference is update cadence: Cairn Maps at every 6 days against InstaSOS's every 3 weeks. InstaSOS's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price, ads and in-app purchases there is nothing between them.

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

InstaSOS ships an update every 3 weeks, Cairn Maps every 6 days. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | InstaSOS | Cairn Maps |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 51 MB | 15 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Empathetech](https://appshunter.io/developer/1743866691) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### InstaSOS

[App page](https://appshunter.io/ios/app/instasos/id6744280817)

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

**In-app purchases:** none


### Cairn Maps

[App page](https://appshunter.io/ios/app/cairn-maps/id6756520443)

**In-app purchases:** none


## Frequently asked questions

### Is InstaSOS free?

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

### Is Cairn Maps free?

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

### Do InstaSOS or Cairn Maps have ads?

Neither InstaSOS nor Cairn Maps shows ads.

### Which is updated more often, InstaSOS or Cairn Maps?

InstaSOS ships an update every 3 weeks, and Cairn Maps every 6 days. Most recently, InstaSOS was updated on October 20, 2026 and Cairn Maps on October 14, 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.*