Comparison

EMF Field Detector RF Scanner vs Blue Hound

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

Blue Hound

Easily scan and locate your Bluetooth-enabled devices, including smartwatches, fitness trackers, and tags. Find lost items like keys or drones using signal strength, heat maps, or direction finders. The app identifies devices by name, maker, and model, and allows you to search the cloud for previously found items.

Highlights
  • Real-time Bluetooth scanning
  • Signal strength meter
  • Heat map and direction finder
  • Cloud search for past devices
  • Smart device identification
  • Power saver mode
  • Audio alerts
Features
Currently charting
Read full description

The essential Bluetooth app for scanning and locating your smart devices from Apple, FitBit, Garmin, and many other companies. Scan and identify nearby devices. Locate devices by signal strength, heat map or direction finder. You can now find Fitbit and other Bluetooth devices that are paired with your iPhone. If the Bluetooth device is paired with another iPhone, turn off Bluetooth on that iPhone. Blue Hound is always scanning for Bluetooth devices. When a device is detected, Blue Hound identifies it by name, maker and model when possible. It does this using a large database of smart recognizers that are updated automatically. Devices you find are uploaded to the cloud to help you search for them later. Blue Hound works great with Bluetooth tags. If you attach one to your keys, you can locate them within 100 feet or more even outdoors in high grass. Attach one to your drone and you will be able to find it if it lands unexpectedly. Scanning for Bluetooth devices can be a fun outdoor activity. Take Blue Hound out for a walk. Enable Power Saver Mode for Blue Hound in Settings and put your iPhone in your pocket upside down. The screen will go dark and the app will enter power saver mode. If you wish, Blue Hound can even bark to alert you when a new device is found. Blue Hound has features not found in any other Bluetooth scanner or finder: • Real time Bluetooth scanner with signal strength and description • Sort the scanner list by age, distance or name • Filter the scanner list for matching text • List both active and inactive devices • Power saver option and audio alerts for scanning while walking • Search the cloud for devices you have found in the past • Search for past devices using an interactive map • Smart device identification using cloud updated recognizers • Display detailed information about a devices including is maker and model • Search Google for more information about the device • Get directions to the last known location of the device • Locate a device indoors using a signal strength meter • Locate a device outdoors using a heat map and signal graph • Outdoor direction finder saves time when searching • Display the directions on the map to triangulate the location

Screenshots

EMF Field Detector RF Scanner4 screens
Blue Hound4 screens

Verdict

The call

The clearest difference is in-app purchases: Blue Hound at none against EMF Field Detector RF Scanner's 2. Blue Hound also leads on ads (none vs shown) and price ($1.99 vs $4.99). EMF Field Detector RF Scanner's advantage is review sentiment (84% vs 57%) and ratings volume (5.5K vs 914). On rating, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

EMF Field Detector RF Scanner costs $4.99 and Blue Hound $1.99 up front. EMF Field Detector RF Scanner sells 2 one-off in-app purchases. Blue Hound asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Blue Hound holds the better App Store score, 4.6 against 4.5. That said, the two scores are not equally well evidenced: EMF Field Detector RF Scanner has 5.5K ratings behind it against 914, so its average is the more settled of the two. Written reviews complicate that: 84% of EMF Field Detector RF Scanner's written reviews are positive against 57% of Blue Hound's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

EMF Field Detector RF Scanner ships an update every 3 weeks, Blue Hound every 5 weeks. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

Scorecard8 real differences · 3 level
EMF Field Detector RF Scanner versus Blue Hound: the parameters behind the verdict, then further details
ParameterEMF Field Detector RF ScannerBlue Hound
Price$4.99$1.99 — better
Rating4.5 (5.5K ratings)4.6 (914 ratings) — better
Positive reviews83.6% of reviews — better56.8% of reviews
Number of ratings5.5K — better914
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank—#53 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.611.0 — better
Further details — not scored
Size56 MB6 MB
Age rating4+4+
DeveloperJorge Gregorio Martin BelloGrangerFX

Customer experience

EMF Field Detector RF Scanner

All ratings5,535 ratings
Positive90.4%
Neutral5.4%
Negative4.2%
Written reviews1,131 reviews
Positive83.6%
Neutral5.5%
Negative10.9%

Blue Hound

All ratings912 ratings
Positive91.0%
Neutral3.1%
Negative5.9%
Written reviews44 reviews
Positive56.8%
Neutral4.5%
Negative38.6%

User reviews

EMF Field Detector RF Scanner

From 5.5K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Accurate readings
  • 💡 Useful for detecting EMF
  • 🔍 Helps identify problem areas
  • 📊 Provides clear data and insights

Room to improve

  • 🐛 Occasional glitches or inconsistent readings
  • 🔋 Concerns about phone's own EMF emissions
  • 💰 Premium version required for full functionality

Blue Hound

From 914 App Store ratings

What we love

  • 👍 Functional
  • 🚀 Found lost items quickly
  • 💡 Useful for finding lost/misplaced items
  • 👍 Cheaper than buying a new device

Room to improve

  • 🐛 Key features not working (heatmap, compass)
  • 🐛 Inaccurate distance/location information
  • 🤔 Lack of instructions/tutorial
  • 🤔 Limited device detection

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

Blue Hound

Reported bugs

3 issues
  • Unable to detect nearby Bluetooth devices
  • Inconsistent performance, app not working at times
  • Inaccurate distance and location information

Requested features

4 requests
  • Ability to set device parameters and utilize scanned devices
  • Device details like MAC address, identifiers
  • Tutorial or onboarding for new users
  • Option to block outside device connections for security

In-app purchases

2 purchases

EMF Field Detector RF Scanner

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

Blue Hound

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 Blue Hound free?
Blue Hound costs $1.99, with no in-app purchases.
Which has better reviews, EMF Field Detector RF Scanner or Blue Hound?
Blue Hound is rated higher. EMF Field Detector RF Scanner averages 4.5 out of 5 from 5.5K ratings, while Blue Hound averages 4.6 from 914 ratings.
Do EMF Field Detector RF Scanner or Blue Hound have ads?
EMF Field Detector RF Scanner shows ads; Blue Hound does not.
Which is updated more often, EMF Field Detector RF Scanner or Blue Hound?
EMF Field Detector RF Scanner ships an update every 3 weeks, and Blue Hound every 5 weeks. Most recently, EMF Field Detector RF Scanner was updated on October 31, 2026 and Blue Hound on October 29, 2026.

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