# Shadow Immobiliser vs 4Warning

The clearest difference is in-app purchases: Shadow Immobiliser at none against 4Warning's 1. 4Warning's advantage is update cadence (every 2 weeks vs every 4 months) and iOS requirement (13.2 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. 4Warning sells 1 in-app purchase, starting at $3.99 per year. Shadow Immobiliser asks for nothing beyond the download.

Shadow Immobiliser ships an update every 4 months, 4Warning every 2 weeks. The most recent releases landed on October 11, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Shadow Immobiliser | 4Warning |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.5 (2 ratings)](https://appshunter.io/ios/app/4warning/id1581580861/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 98 MB | 49 MB |
| Requires iOS | 15.6 | **13.2** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Global Telemetrics Limited](https://appshunter.io/developer/631363823) | [Paul Johnson](https://appshunter.io/developer/1581580863) |

## What reviewers say

### Shadow Immobiliser

[App page](https://appshunter.io/ios/app/shadow-immobiliser/id1550096830)

**In-app purchases:** none


### 4Warning

[App page](https://appshunter.io/ios/app/4warning/id1581580861)

This location-based service alerts users within a half-mile radius of live hazards and traffic disruptions. Report incidents like accidents with text, photos, or voice messages to help others avoid delays.

**Highlights:** Location-based hazard alerts, 1/2 mile alert radius, Report road accidents, Live map with incident icons, Share text, video, photo, voice messages, Avoid traffic delays

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Plan | $3.99 | per year |


## Frequently asked questions

### Is Shadow Immobiliser free?

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

### Is 4Warning free?

4Warning is free to download, with in-app purchases available.

### Do Shadow Immobiliser or 4Warning have ads?

Neither Shadow Immobiliser nor 4Warning shows ads.

### Which is updated more often, Shadow Immobiliser or 4Warning?

Shadow Immobiliser ships an update every 4 months, and 4Warning every 2 weeks. Most recently, Shadow Immobiliser was updated on October 11, 2026 and 4Warning on October 4, 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.*