Comparison

EMF Radiation Detector Reader vs GMCMap

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

EMF Radiation Detector Reader

Detect electromagnetic fields (EMF) around you using your phone's sensors. Identify high-radiation zones in your home and workplace to better organize your environment and potentially improve well-being. Measure EMF emitted by various electronic devices and appliances.

Highlights
  • Detect EMF radiation
  • Measure EMF levels
  • Identify risk zones
  • Organize living space
  • Measure appliance emissions
  • No expensive equipment needed
Features
Read full description

> Detect Invisible Fields: Find the ElectroMagnetic Fields around you in seconds > Pro-Grade Precision: High-accuracy Magnetic Field Analyzer & Gauss Meter with Advanced Signal Stabilization. > Record, Analyze & Export: track trends with interactive data charts and save detailed logs for professional analysis. Check out the areas where you work (desk, meeting rooms), where you sleep (bed), where you relax (couch, living room) and find the levels of EMF you are exposed to. Also use the app to measure the fields emitted by your appliances (computer, fridge, speaker, phone...). PROFESSIONAL MAGNETIC FIELD ANALYZER & GAUSS METER: Discover the invisible magnetic world around you. Using your device’s internal magnetometer, the app provides a comprehensive look at the electromagnetic fields (ELF) generated by electronic devices, wiring, and ferromagnetic materials. NEW PROFESSIONAL FEATURES: - 3-Axis Vector Analysis: Real-time $x, y,$ and $z$ coordinate tracking for precise field directionality. - Interactive History Graphs: Visualize time evolution with high-resolution charts that track spikes and trends. - Clean Signal Mode (LPF): Toggle an advanced Low-Pass Filter to stabilize readings and remove sensor jitter for professional-grade clarity - Save & Export Logs: Record your sessions and export data for further analysis in external software. VERSATILE USE CASES: Electronics Inspection: Measure the magnetic footprint of computers, speakers, and home appliances. Metal Detection: Locate ferromagnetic objects like iron pipes or steel studs behind walls. Interference Calibration: Find the "quietest" zones for sensitive electronic equipment or audio setups. USER EXPECTATIONS & DISCLOSURE: This app is designed as a sophisticated utility for detecting Magnetic Fields (ELF). What it detects: Magnetic flux from magnets, ferrous metals, and the low-frequency electromagnetic fields emitted by electronic components, power supplies, and speakers. What it does NOT detect: This app is not a radio frequency (RF) scanner. It cannot detect Wi-Fi signals, Bluetooth, 5G cellular radiation, or microwave leakage. DISCLAIMER: - This app is intended for educational and utility purposes. It is not a substitute for certified industrial or scientific equipment. It does not provide medical advice or guarantee "safe zones" in a clinical sense. This app does not guarantee exact measures as other fields can interfere with the compass inside your phone, which is used to detect the fields. SUBSCRIPTIONS: - Length: weekly, yearly - Your payment will be charged at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - To Manage or Cancel your subscription, it can be done via the Settings app of your device. For more detail, see https://support.apple.com/en-us/118428 . - To Manage or Cancel your subscription, it can also be done directly from the app: Go to ‘Settings’ screen inside our app, tap on ‘Manage Subscriptions’ and the app will directly open the list of your Subscriptions with the AppStore. You can select a subscription and check available plans or cancel subscription. - When canceling a subscription, your subscription will remain active until the end of the period. Auto-renewal will be disabled but the current subscription will not be refunded. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Read our Privacy Policy at: https://roundingsquares.com/privacy/ Read our Terms of Use at: https://roundingsquares.com/terms/

About

GMCMap

This app provides a real-time radiation map of the world, displaying current radiation levels from monitoring stations globally. It features an interactive map, historical data, and trend analysis for comprehensive environmental vigilance.

Highlights
  • Real-time radiation data
  • Global coverage map
  • Interactive map interface
  • Historical data and trends
  • Mobile convenience
Read full description

GMCMap, is your go-to mobile app for providing users with a real-time radiation world map. Designed to offer a comprehensive and up-to-date view of global radiation levels, this user-friendly and accessible tool is an essential resource for individuals, organizations, and authorities concerned with monitoring and understanding radiation patterns across the world. Key Features: Mobile Convenience: Access GMCMap seamlessly on your mobile device. Stay updated with real-time radiation data, whether you're at home or on the go. Real-Time Data: GMCMap harnesses the power of advanced technology and data sources to present real-time radiation measurements from various monitoring stations worldwide. Users can access the latest information, enabling them to respond swiftly to any potential radiation-related incidents or track ongoing situations. Global Coverage: With extensive coverage encompassing regions from densely populated urban centers to remote locations, the platform offers an accurate portrayal of radiation levels on a global scale. It allows users to visualize the distribution of radiation and assess potential risks at different locations. Interactive Map Interface: The interactive map interface of GMCMap allows users to explore radiation data effortlessly. Users can zoom in to view specific areas in greater detail or zoom out for a broader perspective of the global radiation situation. By clicking on individual monitoring points, users can access more detailed information about the specific radiation levels at that location. Radiation Trends and Analysis: GMCMap doesn't only provide instantaneous radiation levels; it also offers historical data and trend analysis, allowing users to track long-term changes and fluctuations in radiation levels. This feature can be particularly valuable for researchers, policymakers, and environmental agencies studying radiation patterns and their potential impact. GMCMap is an indispensable tool for radiation monitoring, research, and environmental vigilance. Download the app now and empower yourself to make informed decisions, contribute to a safer world, and protect what matters most.

Screenshots

EMF Radiation Detector Reader3 screens
GMCMap4 screens

Verdict

The call

The clearest difference is in-app purchases: GMCMap at none against EMF Radiation Detector Reader's 2. GMCMap also leads on ads (none vs shown) and review sentiment (70% vs 53%). EMF Radiation Detector Reader's advantage is rating (4.5 vs 4.1) and ratings volume (4.7K vs 19). On price, update cadence, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. EMF Radiation Detector Reader sells 2 in-app purchases, starting at $1.99 per 7 days. GMCMap asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

EMF Radiation Detector Reader holds the better App Store score, 4.5 against 4.1. That said, the two scores are not equally well evidenced: EMF Radiation Detector Reader has 4.7K ratings behind it against 19, so its average is the more settled of the two. Written reviews complicate that: 53% of EMF Radiation Detector Reader's written reviews are positive against 70% of GMCMap's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

EMF Radiation Detector Reader ships an update every 7 months, GMCMap every 5 months. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

Scorecard6 real differences · 4 level
EMF Radiation Detector Reader versus GMCMap: the parameters behind the verdict, then further details
ParameterEMF Radiation Detector ReaderGMCMap
PriceFreeFree
Rating4.5 (4.7K ratings) — better4.1 (19 ratings)
Positive reviews52.8% of reviews70.0% of reviews — better
Number of ratings4.7K — better19
Update frequencyEvery 7 monthsEvery 5 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size20 MB27 MB
Age rating4+4+
DeveloperRounding Squares BVGQ Electronics LLC

Customer experience

EMF Radiation Detector Reader

All ratings4,738 ratings
Positive87.4%
Neutral4.8%
Negative7.8%
Written reviews371 reviews
Positive52.8%
Neutral8.9%
Negative38.3%

GMCMap

All ratings19 ratings
Positive78.9%
Neutral0.0%
Negative21.1%
Written reviews10 reviews
Positive70.0%
Neutral0.0%
Negative30.0%

Bugs and requests

EMF Radiation Detector Reader

Reported bugs

2 issues
  • Readings inconsistent or inaccurate
  • Doesn't work as expected, only detects magnets

Requested features

3 requests
  • Add sound or vibration alerts for high EMF
  • Provide more information on EMF levels and safety
  • Improve layout to avoid ads covering readings

GMCMap

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

EMF Radiation Detector Reader

Subscriptions2
  • EMF Radiation Detector Premium Week3 Days trial$1.997 Days
  • EMF Radiation Detector Premium Year$9.991 Year
None

GMCMap

No in-app purchases

Questions

Is EMF Radiation Detector Reader free?
EMF Radiation Detector Reader is free to download, with in-app purchases available.
Is GMCMap free?
GMCMap is free to download, with no in-app purchases.
Which has better reviews, EMF Radiation Detector Reader or GMCMap?
EMF Radiation Detector Reader is rated higher. EMF Radiation Detector Reader averages 4.5 out of 5 from 4.7K ratings, while GMCMap averages 4.1 from 19 ratings.
Do EMF Radiation Detector Reader or GMCMap have ads?
EMF Radiation Detector Reader shows ads; GMCMap does not.
Which is updated more often, EMF Radiation Detector Reader or GMCMap?
EMF Radiation Detector Reader ships an update every 7 months, and GMCMap every 5 months. Most recently, EMF Radiation Detector Reader was updated on September 24, 2026 and GMCMap on September 22, 2026.

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