Ultrasonic Repeller vs EMF Detector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ultrasonic Repeller
This app uses ultrasound technology to create a protective barrier against insects, rodents, and aggressive dogs. It also offers features for personal space and experimental bat deterrence, with advanced controls and Apple Watch integration.
- Insect repellent
- Rodent deterrent
- Dog deterrent
- Personal space protector
- Apple Watch support
- High-precision frequency generator
- Background mode
Read full descriptionHide full description
Discover the power of ultrasound technology right in your pocket! Ultrasonic Repeller is a revolutionary app that transforms your iPhone into the ultimate protection device against a wide range of unwanted encounters. Key Features: Insect Repellent: Say goodbye to pesky mosquitoes and other bothersome insects. Rodent Deterrent: Keep mice and rats at bay with powerful ultrasonic frequencies. Dog Deterrent: Safely discourage aggressive dogs without harm. Personal Space Protector: Maintain your personal bubble in crowded spaces. Experimental Bat Repellent Mode: Test our cutting-edge technology designed to deter flying mammals. Advanced Functionality: EXCLUSIVE! Apple Watch Support: Take your protection to the next level with our Apple Watch app, allowing for quick and discreet activation right from your wrist! NEW! High-Precision Frequency Generator: Fine-tune your deterrent signals with our advanced, newly implemented frequency control system. Background Mode: Continuous protection even when your phone is locked. Live Activity Support: Quick access to controls from your lock screen. Dynamic Island Integration: Seamless monitoring on compatible iPhone models. Ultrasonic Repeller is incredibly user-friendly and absolutely ad-free! No need to invest in expensive hardware devices. Your iPhone, combined with our app, provides all the protection you need. Experience the future of personal safety and pest control. Download Ultrasonic Repeller now and take control of your environment!
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
Read full descriptionHide full description
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 price: EMF Detector at Free against Ultrasonic Repeller's $0.59. EMF Detector also leads on rating (4.3 vs 3.6) and update cadence (every 2 weeks vs every 2 months). Ultrasonic Repeller's advantage is in-app purchases (none vs 3) and review sentiment (44% vs 25%). On ads 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
EMF Detector is free to download; Ultrasonic Repeller costs $0.59 up front. EMF Detector sells 2 in-app purchases, starting at $4.99 per month. Ultrasonic Repeller asks for nothing beyond the download.
EMF Detector holds the better App Store score, 4.3 against 3.6. That said, the two scores are not equally well evidenced: EMF Detector has 319 ratings behind it against 51, so its average is the more settled of the two. Written reviews complicate that: 44% of Ultrasonic Repeller'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.
Ultrasonic Repeller ships an update every 2 months, EMF Detector every 2 weeks. Both last shipped on October 18, 2026.
| Parameter | Ultrasonic Repeller | EMF Detector |
|---|---|---|
| Price | $0.59 | Free — better |
| Rating | 3.6 (51 ratings) | 4.3 (319 ratings) — better |
| Positive reviews | 43.6% of reviews — better | 25.0% of reviews |
| Number of ratings | 51 | 319 — better |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 16.1 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandr Balyberdin | 新雨 李 |
Customer experience
Ultrasonic Repeller
EMF Detector
Bugs and requests
Ultrasonic Repeller
Reported bugs
9 issues- App crashes on startup (multiple iOS versions)
- Incompatible with iOS 8 and older versions
- App force closes when screen is locked
- Crashes on iPhone 6s and later models
- No sound output on iPad 1
Show 4 moreShow fewer
- App doesn't open or loads to grey screen
- Volume controls not accessible in app
- Flickers and immediately closes
- Compatibility issues with various iOS versions
Requested features
10 requests- Add cat repeller mode
- Add bat repeller mode
- Add ant repeller mode
- Add fly repeller mode
- Add snake repeller mode
Show 5 moreShow fewer
- Background operation when screen locked
- Better volume control interface
- External speaker integration
- Continuous operation mode
- User instructions and support documentation
EMF Detector
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ultrasonic Repeller
No in-app purchases
EMF Detector
- unlimited features2 variants$4.991 Month
- unlimited features$14.99
Questions
Is Ultrasonic Repeller free?
Is EMF Detector free?
Which has better reviews, Ultrasonic Repeller or EMF Detector?
Do Ultrasonic Repeller or EMF Detector have ads?
Which is updated more often, Ultrasonic Repeller or EMF Detector?
Other comparisons
