Shadow Immobiliser vs 4Warning
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Shadow Immobiliser
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The Shadow Immobiliser is the UK's first connected immobiliser, allowing you to secure your vehicle with innovative and reliable technology. The system works by automatically immobilising your vehicle when your ignition is switched off. Once installed in your vehicle, you can operate through the presence of our unique Driver Detection Key Cards or via this app. Key features of the app include: * Set up secure key control for multiple vehicles. * Override for timed periods for when you have your vehicle in for service or repair. * Set a schedule so your vehicle is protected by Shadow Immobiliser at your convenience. * See your Key Card battery levels so you know when to recharge. Please note you need Shadow Immobiliser installed in your vehicle before using this app. Please contact us via our website for fitting options.
4Warning
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.
- 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
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4Warning is a location-based app service that allows anyone who has downloaded this application to alert other members within a 1/2 mile radius of live hazards or disruptions when commuting around our cities and roads For example, if a 4Warning member(John Smith for example) observes a road accident that is causing built-up traffic he simply open the app and selects the road accident icon, and press enter. 4Warning then simply alerts all other members within 1/2mile of John’s position with a live map showing the road accident icon and additional information (text, video, photo, or voice message). This allows members the opportunity to avoid the area and delays. Drivers in the UK spend on average 115 hours per year in traffic jams. 4Warning was developed to help drivers avoiding unnecessary delays and costly disruptions to their daily commute. Privacy Policy & Terms of use: https://bit.ly/3CXmRDR
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Shadow Immobiliser | 4Warning |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.5 (2 ratings) — better |
| Positive reviews | — | 80.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.6 | 13.2 — better |
| Further details — not scored | ||
| Size | 98 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | Global Telemetrics Limited | Paul Johnson |
In-app purchases
Shadow Immobiliser
No in-app purchases
4Warning
- Yearly Plan$3.991 Year
Questions
Is Shadow Immobiliser free?
Is 4Warning free?
Do Shadow Immobiliser or 4Warning have ads?
Which is updated more often, Shadow Immobiliser or 4Warning?
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