Comparison

EMF Radiation Detector Reader vs Smell Annotator

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

Smell Annotator

This application enables machines to digitally sense and analyze smells using nanomaterial-based technology. It allows users to view, annotate, and recognize smell measurements in real-time, functioning as part of a developer kit.

Highlights
  • Smell recognition
  • Smell digitalization and annotation
  • Saving and loading measurements
  • Real-time measurement visualization
  • Offline data collection
  • Graph synchronization
Features
Read full description

Today, machines can see, hear, feel, and even learn. But smell? Not really! Our nanomaterial-based technology enables machines to use an electronic sense of smell. Smell Annotator app is an AI-based software program which is used to view, annotate and analyze smell measurements taken with the Smell Inspector and to recognize annotated smells in real time. The Smell Annotator app is a part of the Smell Inspector Developer Kit. The Smell Annotator gives you access to the smell sensors of your Smell Inspector developer kit. APP FEATURES * Smell recognition [NEW] * Smell digitalization and annotation * Saving measurements and loading saved data * Visualization of real-time and saved measurements with temperature and humidity data * Collect measurement data with or without internet access * Sync graphs for better clarity of data SENSORS * 4 Smell iX16 detector chips * Temperature sensor * Humidity sensor SMELL INSPECTOR The Smell Inspector is a ready-to-use device for anyone and a developer kit. It is suitable for testing and exploring different smell-related applications in the fields of product quality, safety & security, life & care, air quality, and many others. It has four Smell iX 16 detector chips inside, can be connected to a PC, tablet, or smartphone, and can be operated with Smell Annotator software. USER MANUAL For more information about how to use the App and the Smell Inspector device, go to: http://smart-nanotubes.com/downloads/ ABOUT US Along with a great community of industry experts and researchers, SmartNanotubes Technologies shares the vision of digital smell recognition. Our goal is to enable digital smell recognition in a fast and easy way and help our customers to develop product solutions for their own smell and gas detection applications. Visit us at: http://smart-nanotubes.com

Screenshots

EMF Radiation Detector Reader3 screens
Smell Annotator3 screens

Verdict

The call

The clearest difference is rating: EMF Radiation Detector Reader at 4.5 against Smell Annotator's 1.0. EMF Radiation Detector Reader also leads on ratings volume (4.7K vs 1). Smell Annotator's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, 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. Smell Annotator 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 1.0. That said, the two scores are not equally well evidenced: EMF Radiation Detector Reader has 4.7K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

EMF Radiation Detector Reader ships an update every 7 months, Smell Annotator monthly. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

Scorecard6 real differences · 4 level
EMF Radiation Detector Reader versus Smell Annotator: the parameters behind the verdict, then further details
ParameterEMF Radiation Detector ReaderSmell Annotator
PriceFreeFree
Rating4.5 (4.7K ratings) — better1.0 (1 ratings)
Positive reviews52.8% of reviews—
Number of ratings4.7K — better1
Update frequencyEvery 7 monthsMonthly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size20 MB53 MB
Age rating4+4+
DeveloperRounding Squares BVSmartNanotubes Technologies

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%

Smell Annotator

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

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

Smell Annotator

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

Smell Annotator

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 Smell Annotator free?
Smell Annotator is free to download, with no in-app purchases.
Which has better reviews, EMF Radiation Detector Reader or Smell Annotator?
EMF Radiation Detector Reader is rated higher. EMF Radiation Detector Reader averages 4.5 out of 5 from 4.7K ratings, while Smell Annotator averages 1.0 from 1 ratings.
Do EMF Radiation Detector Reader or Smell Annotator have ads?
EMF Radiation Detector Reader shows ads; Smell Annotator does not.
Which is updated more often, EMF Radiation Detector Reader or Smell Annotator?
EMF Radiation Detector Reader ships an update every 7 months, and Smell Annotator monthly. Most recently, EMF Radiation Detector Reader was updated on September 24, 2026 and Smell Annotator on September 14, 2026.

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