EMF Hunter vs Sensor Technology Engineering
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EMF Hunter
Transform your phone into an electromagnetic field detector. It uses your device's internal compass to measure magnetic and electric fluctuations, displaying readings through meters, graphs, and particle effects. Ideal for educational or entertainment purposes.
- Detects magnetic field strength in three dimensions
- Easy-to-read meter with LED indicators
- Multiple graph views (line, bar, polar, pie)
- Particle mode visualizes magnetic force
- Start and pause detection functionality
- Displays force in microteslas
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------------- EMF Hunter ------------- This app is intended for entertainment purposes only. This app supports devices with an internal compass. This includes iPhone 3GS and newer iPhone devices. ------------- Description ------------- User your phone as an EMF (electromagnetic field) detector. This app uses the power of your phones internal compass to detect magnetic and electric fluctuations in the environment around you. This is perfect for people looking to detect magnetic fields: teachers, students, technophiles, and even Ghost hunters! This app is not intended to be a scientific instrument, and it's readings are subject to external conditions and the accuracy of the device's internal compass. ------------- Features ------------- * Detects the strength of magnetic fields in all three dimensions * Easy to read meter lets you gauge with a simple look the strength of fields in different directions * Light up LED icons display showing field strength, the more LED icons that light up, the more force there is * Graph view shows the changing values of the field from all three dimensions * Line Graph * Bar Graph * Polar Graph * Pie Graph * Particle Mode - the more magnetic force the more particles * Ability to start and pause detection * Magnetic force is calculated in microteslas
Sensor Technology Engineering
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The STE App is the Bluetooth-enabled application for mobile devices to connect with STE radiation detectors. It provides a real-time detection interface in support of Countering Weapons of Mass Destruction (CWMD) and Explosive Ordinance (EoD) Missions. The app contains several features, including radiation exposure, accumulated radiation dosage, geospatial data and a data sharing capability that are primarily used by emergency responders to allow them to take action quickly and decisively. STE App allows the user to connect the STE detectors to mobile devices using Bluetooth communication technology. It enables the user to stream the detector data (gamma and neutron) directly from the detector to a mobile device in real time. Device Connection: Each time the STE device is turned on, Bluetooth communications are enabled, and the device is available for connection for two minutes. If the pairing is successful, the user can view the real time data stream for gamma and neutron detection in the application. Once the device is found and linked to the app, the device ID will be automatically stored in the app. Data Streaming: After the successful connection, a waterfall graph and a display meter show the level of gamma detected in real-time, with options to select units such as CPS, µR/h, µrem/h, and µSv/h. STE detectors equipped with neutron detection are visible on the app and measure counts. Once the count rate exceeds the threshold (trip) value, the detector and mobile device will started alarming. Users can toggle between the screens to select various functions of the app. Geo-Mapping: The app has an intuitive interface with a basic navigation system. That will display the "trace history" of where the detector has been carried. If the device detects radiation and sounds an alarm, the map will trace that information with colors. The exact location and address will be recorded in the alarm data. Data Sharing: STE app compiles all the relevant data that can be shared via emails, SMS, and other methods available on the mobile device.
Screenshots
Verdict
The clearest difference is ads: Sensor Technology Engineering at none against EMF Hunter's shown. Sensor Technology Engineering also leads on update cadence (every 7 months vs every 22 months). On price, in-app purchases, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
EMF Hunter ships an update every 22 months, Sensor Technology Engineering every 7 months. The most recent releases landed on September 10, 2026 and September 15, 2026 respectively.
| Parameter | EMF Hunter | Sensor Technology Engineering |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (10 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 22 months | Every 7 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 6 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Derek Hoffmeister | Sensor Technology Engineering |
In-app purchases
EMF Hunter
No in-app purchases
Sensor Technology Engineering
No in-app purchases
Questions
Is EMF Hunter free?
Is Sensor Technology Engineering free?
Do EMF Hunter or Sensor Technology Engineering have ads?
Which is updated more often, EMF Hunter or Sensor Technology Engineering?
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