Comparison

EMF Field Detector RF Scanner vs smartDF

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

Head to head
About

EMF Field Detector RF Scanner

Detect electromagnetic fields (EMF) using your device's sensors. Get alerted to high magnetic fields and potential radiation sources in your home. Useful for identifying hidden emitters and understanding your environment.

Highlights
  • Detects electromagnetic fields (EMF)
  • Warns of high magnetic fields with beeps
  • Measures magnetic force on three axes
  • Records readings with time and date stamps
  • Stores up to 100 records
  • Sends measurements via email
Read full description

Turn your iPhone into a powerful EMF detector and magnetic field scanner. Detect electromagnetic fields (EMF) around you instantly using the built-in sensor already inside your device — no expensive equipment required. Whether you want to monitor electromagnetic radiation in your home, locate hidden magnetic sources, or even explore paranormal activity, this app gives you a simple and exciting way to measure the invisible world around you. Use the app to scan bedrooms, walls, electrical appliances, Wi-Fi zones, sockets, microwaves, wireless devices, and more. Discover areas with unusually high magnetic activity and receive an instant warning beep when strong EMF levels are detected. Many users also enjoy using the app during ghost hunts and paranormal investigations, as sudden magnetic fluctuations are often associated with supernatural activity. NEW: Experience EMF detection in Augmented Reality. Visualize electromagnetic fields in Augmented Reality to better understand how EMFs spread throughout your home, office, or workspace. The app allows you to see a figurative representation of magnetic activity around you, helping you identify high-radiation zones and understand how far electromagnetic fields may reach in real-world environments. Explore EMFs in a more immersive and intuitive way by combining real-time detection with AR visualization technology. Transform your iPhone into a digital EMF Meter, Teslameter, or electromagnetic field tester using the internal compass hardware. View live magnetic field readings in real time and monitor changes on all three axes (X, Y, Z). Scientists, engineers, students, teachers, paranormal investigators, and curious explorers use EMF detectors to measure magnetic activity in everyday environments. Why use this app? • Detect high electromagnetic field zones around you • Monitor EMF levels near beds, appliances, or workspaces • Receive warning alerts when strong magnetic radiation is detected • Track and store measurements with time and date stamps • Investigate unusual magnetic fluctuations during ghost hunting sessions • Find metallic objects, pipes, or hidden sources behind walls • Explore the invisible electromagnetic world around you Features: • Real-time EMF and magnetic field detection • Warning beep near strong radiation sources • Measures magnetic force on X, Y, and Z axes • Magnetic readings displayed in microteslas (µT) • Save up to 100 EMF records • Record events with exact date & time • Export and send measurements by email • Easy-to-use digital display interface Electromagnetic radiation may come from electrical wiring, appliances, wireless devices, cordless phones, Wi-Fi equipment, sockets, and other electronic sources in your environment. Tips: For best accuracy, calibrate your iPhone by moving it in a figure-8 motion before use. Important: This app requires an iPhone with compass hardware and will not work on iPod Touch devices. Disclaimer: This app is intended for entertainment and informational purposes only. It uses the iPhone magnetometer sensor to detect magnetic field variations near ferromagnetic objects and electromagnetic sources. Download now and start discovering the hidden electromagnetic activity around you.

About

smartDF

Features
Read full description

iPadOS application designed in cooperation between certified developer Carlos Lago and Rhotheta International Inc - www.rhothetaint.com - for the remote control and monitoring of Rhotheta radio direction finders via Bluetooth (BLE) or Wi-Fi. A modern UI for direction finder (DF) products increases crew productivity and enhances mission awareness during search-and-rescue, law enforcement, and special missions. DF sensor data is conveniently displayed over maps with state-of-the-art graphics.

Screenshots

EMF Field Detector RF Scanner4 screens

Verdict

The call

The clearest difference is price: smartDF at Free against EMF Field Detector RF Scanner's $4.99. smartDF also leads on in-app purchases (none vs 2) and ads (none vs shown). EMF Field Detector RF Scanner's advantage is device support (3 vs 1). On 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

smartDF is free to download; EMF Field Detector RF Scanner costs $4.99 up front. EMF Field Detector RF Scanner sells 2 one-off in-app purchases. smartDF asks for nothing beyond the download.

UpkeepUpdate frequency

EMF Field Detector RF Scanner ships an update every 3 weeks, smartDF weekly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 5 level
EMF Field Detector RF Scanner versus smartDF: the parameters behind the verdict, then further details
ParameterEMF Field Detector RF ScannersmartDF
Price$4.99Free — better
Rating4.5 (5.5K ratings) — better—
Positive reviews83.6% of reviews—
Number of ratings5.5K — better—
Update frequencyEvery 3 weeksWeekly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS15.615.4 — better
Further details — not scored
Size56 MB59 MB
Age rating4+4+
DeveloperJorge Gregorio Martin BelloCarlos Yordanis Lago Gonzalez

Bugs and requests

EMF Field Detector RF Scanner

Reported bugs

2 issues
  • App freezes or stops working after updates
  • Readings not always accurate or reliable

Requested features

3 requests
  • Ability to export data
  • More detailed explanations and guidance
  • Compatibility with other EMF measurement devices

smartDF

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

EMF Field Detector RF Scanner

One-time2
  • Premium Pack$4.99
  • Special Offer$4.99
None

smartDF

No in-app purchases

Questions

Is EMF Field Detector RF Scanner free?
EMF Field Detector RF Scanner costs $4.99, and also offers in-app purchases.
Is smartDF free?
smartDF is free to download, with no in-app purchases.
Do EMF Field Detector RF Scanner or smartDF have ads?
EMF Field Detector RF Scanner shows ads; smartDF does not.
Which is updated more often, EMF Field Detector RF Scanner or smartDF?
EMF Field Detector RF Scanner ships an update every 3 weeks, and smartDF weekly. Most recently, EMF Field Detector RF Scanner was updated on October 28, 2026 and smartDF on October 25, 2026.

Other comparisons