# Mobile SOS vs Knot Not

The clearest difference is in-app purchases: Mobile SOS at none against Knot Not's 1. Mobile SOS also leads on iOS requirement (13.0 vs 17.6). Knot Not's advantage is update cadence (every 6 months vs every 44 months). On price, ads and device support there is nothing between them.

Both are free to download. Knot Not sells 1 one-off in-app purchase. Mobile SOS asks for nothing beyond the download.

Mobile SOS ships an update every 44 months, Knot Not every 6 months. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Mobile SOS | Knot Not |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 44 months | **Every 6 months** |
| Size | 36 MB | 6 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SOS, Inc.](https://appshunter.io/developer/1658400757) | [ZHENGZE PEI](https://appshunter.io/developer/1765491666) |

## What reviewers say

### Mobile SOS

[App page](https://appshunter.io/ios/app/mobile-sos/id1658400755)

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

**In-app purchases:** none


### Knot Not

[App page](https://appshunter.io/ios/app/knot-not-conflicts-tracker/id6753355545)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knotnot Premium | $1.99 | one-time |


## Frequently asked questions

### Is Mobile SOS free?

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

### Is Knot Not free?

Knot Not is free to download, with in-app purchases available.

### Do Mobile SOS or Knot Not have ads?

Neither Mobile SOS nor Knot Not shows ads.

### Which is updated more often, Mobile SOS or Knot Not?

Mobile SOS ships an update every 44 months, and Knot Not every 6 months. Most recently, Mobile SOS was updated on October 13, 2026 and Knot Not 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.*