4Warning vs EMF Detector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
EMF Detector
Transform your iPhone into an EMF detector to monitor electromagnetic fields. Identify radiation levels in various environments to assess safety at home, work, or in public spaces. Gain insights to make informed decisions about your surroundings.
- EMF monitoring
- Electromagnetic field detection
- Radiation level measurement
- Environmental safety assessment
- Real-time EMF readings
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Monitor your surroundings with precision using our EMF Monitoring app, designed exclusively for iOS. This innovative application transforms your iPhone into a powerful EMF detector, enabling you to identify electromagnetic fields in various environments. As you move through different areas, the app continuously measures EMF levels, allowing you to easily pinpoint zones of high and low radiation. Whether you're concerned about safety at home, in the workplace, or in public areas, EMF Monitoring provides the insights you need to assess environmental safety and make informed decisions about your surroundings. This app is using the standard Apple Terms of Use (EULA) https://www.apple.com/legal/ internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: 4Warning at 80% against EMF Detector's 25%. EMF Detector's advantage is rating (4.3 vs 1.5) and ratings volume (319 vs 2). On price, update cadence, ads and in-app purchases 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 and EMF Detector sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
EMF Detector holds the better App Store score, 4.3 against 1.5. That said, the two scores are not equally well evidenced: EMF Detector has 319 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 80% of 4Warning's written reviews are positive against 25% of EMF Detector's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 4, 2026 and October 13, 2026 respectively.
| Parameter | 4Warning | EMF Detector |
|---|---|---|
| Price | Free | Free |
| Rating | 1.5 (2 ratings) | 4.3 (319 ratings) — better |
| Positive reviews | 80.0% of reviews — better | 25.0% of reviews |
| Number of ratings | 2 | 319 — better |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.2 | 13.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul Johnson | 新雨 李 |
Customer experience
4Warning
EMF Detector
In-app purchases
4Warning
- Yearly Plan$3.991 Year
EMF Detector
- unlimited features2 variants$4.991 Month
- unlimited features$14.99
Questions
Is 4Warning free?
Is EMF Detector free?
Which has better reviews, 4Warning or EMF Detector?
Do 4Warning or EMF Detector have ads?
Which is updated more often, 4Warning or EMF Detector?
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