# SOS Light vs Mark You Down Tracking

The clearest difference is in-app purchases: Mark You Down Tracking at none against SOS Light's 1. Mark You Down Tracking also leads on update cadence (every 3 weeks vs every 4 months). SOS Light's advantage is device support (3 vs 1) and iOS requirement (15.3 vs 18.6). On price and ads there is nothing between them.

Both are free to download. SOS Light sells 1 in-app purchase, starting at $0.99 per year. Mark You Down Tracking asks for nothing beyond the download.

SOS Light ships an update every 4 months, Mark You Down Tracking every 3 weeks. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SOS Light | Mark You Down Tracking |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 6 MB | 13 MB |
| Requires iOS | **15.3** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Pieter Yoshua Natanael](https://appshunter.io/developer/1657373397) | [EXIGA SOFTWARE SOLUTIONS PTE LTD](https://appshunter.io/developer/1841067144) |

## What reviewers say

### SOS Light

[App page](https://appshunter.io/ios/app/sos-light-emergency/id6504213303)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | per year |


### Mark You Down Tracking

[App page](https://appshunter.io/ios/app/mark-you-down-tracking/id6761678393)

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

**In-app purchases:** none


## Frequently asked questions

### Is SOS Light free?

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

### Is Mark You Down Tracking free?

Mark You Down Tracking is free to download, with no in-app purchases.

### Do SOS Light or Mark You Down Tracking have ads?

Neither SOS Light nor Mark You Down Tracking shows ads.

### Which is updated more often, SOS Light or Mark You Down Tracking?

SOS Light ships an update every 4 months, and Mark You Down Tracking every 3 weeks. Most recently, SOS Light was updated on October 13, 2026 and Mark You Down Tracking on October 7, 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.*