# Self Defense Alarm Lite vs Lost Map

The clearest difference is in-app purchases: Self Defense Alarm Lite at none against Lost Map's 3. Self Defense Alarm Lite also leads on iOS requirement (8.0 vs 12.0). Lost Map's advantage is update cadence (every 2 days vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Lost Map sells 3 one-off in-app purchases. Self Defense Alarm Lite asks for nothing beyond the download.

Self Defense Alarm Lite ships an update every 10 months, Lost Map every 2 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Self Defense Alarm Lite | Lost Map |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 days** |
| Size | 34 MB | 58 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHIA HO KUO](https://appshunter.io/developer/433588685) | [PING HSIANG HU](https://appshunter.io/developer/1807927885) |

## What reviewers say

### Self Defense Alarm Lite

[App page](https://appshunter.io/ios/app/self-defense-alarm-lite/id851002131)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lost Map

[App page](https://appshunter.io/ios/app/lost-map/id6744515001)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 抖內 $10.00 | $0.29 | one-time |
| 抖內 $31.00 | $0.99 | one-time |
| 抖內 $52.00 | $1.99 | one-time |


## Frequently asked questions

### Is Self Defense Alarm Lite free?

Self Defense Alarm Lite is free to download, with no in-app purchases.

### Is Lost Map free?

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

### Do Self Defense Alarm Lite or Lost Map have ads?

Neither Self Defense Alarm Lite nor Lost Map shows ads.

### Which is updated more often, Self Defense Alarm Lite or Lost Map?

Self Defense Alarm Lite ships an update every 10 months, and Lost Map every 2 days. Most recently, Self Defense Alarm Lite was updated on October 26, 2026 and Lost Map on October 24, 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.*