Comparison

TrueEntropy vs EMF Radiation Detector Reader

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

Head to head
About

TrueEntropy

This app leverages your smartphone's camera to produce genuine random numbers by capturing thermal noise. It generates a high volume of entropy, suitable for cryptographic purposes, and can output data locally or remotely.

Highlights
  • Generate true random numbers from thermal noise
  • Utilizes smartphone camera sensor
  • High volume entropy generation
  • Output binary files locally
  • Send entropy via cryptographic relays
  • Continuous generation mode
Features
Read full description

TrueEntropy uses your phone's camera to generate true random numbers derived from thermal noise. The camera in your smartphone is so advanced that it can detect even the smallest variations produced by fundamental particle physics. We capture thermal variations in every pixel of your phone's camera to create a powerful, high volume entropy random number generator. No need to move your phone - even if your phone is resting on a desktop, it is able to pick up a sufficient quantity of thermal variations to generate random numbers at a rate of 18Mb per minute. - Generate binary files for local use via AirDrop - Send entropy to a destination machine via cryptographic relays - Continuous generation mode to constantly reseed target machines

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/

Screenshots

TrueEntropy3 screens
EMF Radiation Detector Reader3 screens

Verdict

The call

The clearest difference is in-app purchases: TrueEntropy at none against EMF Radiation Detector Reader's 2. TrueEntropy also leads on ads (none vs shown) and review sentiment (67% vs 53%). EMF Radiation Detector Reader's advantage is update cadence (every 6 months vs every 41 months) and ratings volume (5K vs 11). On price, rating 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

Both are free to download. EMF Radiation Detector Reader sells 2 in-app purchases, starting at $1.99 per 7 days. TrueEntropy asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.5 for TrueEntropy against 4.5 for EMF Radiation Detector Reader. That said, the two scores are not equally well evidenced: EMF Radiation Detector Reader has 5K ratings behind it against 11, so its average is the more settled of the two. Written reviews are what separate them: 67% of TrueEntropy's written reviews are positive against 53% of EMF Radiation Detector Reader's.

UpkeepUpdate frequency

TrueEntropy ships an update every 41 months, EMF Radiation Detector Reader every 6 months. The most recent releases landed on October 9, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
TrueEntropy versus EMF Radiation Detector Reader: the parameters behind the verdict, then further details
ParameterTrueEntropyEMF Radiation Detector Reader
PriceFreeFree
Rating4.5 (11 ratings)4.5 (5K ratings)
Positive reviews66.7% of reviews — better53.4% of reviews
Number of ratings115K — better
Update frequencyEvery 41 monthsEvery 6 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.6
Further details — not scored
Size10 MB20 MB
Age rating4+4+
DeveloperVault12, Inc.Rounding Squares BV

Customer experience

TrueEntropy

All ratings11 ratings
Positive90.9%
Neutral9.1%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

EMF Radiation Detector Reader

All ratings4,966 ratings
Positive87.5%
Neutral4.7%
Negative7.8%
Written reviews380 reviews
Positive53.4%
Neutral8.7%
Negative37.9%

Bugs and requests

TrueEntropy

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

TrueEntropy

No 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

Questions

Is TrueEntropy free?
TrueEntropy is free to download, with no in-app purchases.
Is EMF Radiation Detector Reader free?
EMF Radiation Detector Reader is free to download, with in-app purchases available.
Which has better reviews, TrueEntropy or EMF Radiation Detector Reader?
TrueEntropy and EMF Radiation Detector Reader are both rated 4.5 out of 5 on the App Store, from 11 and 5K ratings respectively.
Do TrueEntropy or EMF Radiation Detector Reader have ads?
EMF Radiation Detector Reader shows ads; TrueEntropy does not.
Which is updated more often, TrueEntropy or EMF Radiation Detector Reader?
TrueEntropy ships an update every 41 months, and EMF Radiation Detector Reader every 6 months. Most recently, TrueEntropy was updated on October 9, 2026 and EMF Radiation Detector Reader on October 21, 2026.

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