Comparison

Metal Detector・EMF Reader vs TFAuth

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

Head to head
About

Metal Detector・EMF Reader

Transform your iPhone into a versatile tool for detecting metal objects, locating wall studs, and measuring EMF levels. Utilize the device's built-in magnetometer for real-time insights into magnetic fields and signal strength, perfect for various DIY and utility tasks.

Highlights
  • Detect nearby metal objects
  • Find wall studs, screws, nails, pipes
  • Real-time magnetic field readings
  • Live EMF meter and graph visualization
  • Signal confidence indicator
  • Axis-based directional detection
Features
Read full description

Turn your iPhone into a powerful Metal Detector, Stud Finder & EMF Reader using the built-in magnetometer sensor. Metal Detector helps you locate nearby metal objects, detect magnetic fields, analyze EMF levels, and visualize live magnetometer readings directly from your device. Whether you’re searching for hidden metal, locating wall studs, checking electronics for EMF activity, or exploring magnetic fields around you, this app gives you real-time precision and easy-to-read insights. Perfect for DIY projects, construction work, home improvement, electronics testing, hobby exploration, and everyday utility use. FEATURES • Detect nearby metal objects using your iPhone’s magnetometer • Find wall studs, screws, nails, pipes, and hidden metallic objects • Real-time magnetic field readings in microtesla (µT) • Live EMF meter and magnetometer graph visualization • Signal confidence indicator for stronger detections • Axis-based directional detection system • Smooth real-time graphing of magnetic field activity • Minimal, clean, and professional interface • Fast and lightweight performance • Works instantly with supported iPhones HOW IT WORKS The app uses your iPhone’s built-in magnetometer sensor to measure magnetic field strength. When metal or magnetic objects are nearby, the magnetic field changes and the app displays the variation in real time. You can use Metal Detector to: • Locate metal studs in walls • Find hidden screws or nails • Detect magnetic interference • Measure EMF activity around electronics • Explore magnets and magnetic fields • Scan objects for metallic presence GREAT FOR • DIY & home improvement • Construction & renovation • Electricians & technicians • Hobbyists & explorers • Educational science experiments • Everyday utility detection IMPORTANT NOTES • Accuracy depends on your iPhone’s magnetometer sensor • Best results occur with ferromagnetic metals like iron and steel • Does not work for non ferrous metal like Aluminum, gold, silver • Thick walls or heavy interference can affect readings • Remove magnetic phone accessories for improved accuracy Download Metal Detector today and transform your iPhone into a smart magnetic field scanner, EMF reader, and stud finder tool. Terms of service - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

TFAuth

Features
Read full description

Secure, flexible two-factor authentication for all your Apple devices. This app helps you generate and manage Time-based One-Time Passwords (TOTP) with a focus on privacy, control, and convenience. Whether you prefer working fully offline or syncing with your own 2FAuth server, your authentication codes are always within reach. Secure by design • Protect access with Face ID, Touch ID, or PIN • Store TOTP secrets locally for offline code generation • Designed to keep your authentication data private and accessible only to you Available across your devices • Use on iPhone and iPad with a unified experience • Quickly view codes from your Apple Watch • Access codes directly in Safari with the extension Works online and offline • Generate codes locally without any server connection • Optionally sync with your 2FAuth server for multi-device access • Continue accessing codes even when your server is unavailable Multi-server support • Connect and manage multiple 2FAuth servers • View and organize codes from different servers in one place Organize your accounts • Group accounts for easier navigation • View both current and upcoming codes at a glance Account and server management • Add and edit accounts when connected to your server • Manage users and perform administrative actions (server-dependent) Built for users who want full control over their 2FA experience—whether self-hosted or fully local—without compromising on usability or security.

Screenshots

Metal Detector・EMF Reader3 screens
TFAuth4 screens

Verdict

The call

The clearest difference is device support: TFAuth at 3 against Metal Detector・EMF Reader's 1. On price, update cadence, ads and in-app purchases 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. Metal Detector・EMF Reader sells 1 one-off in-app purchase and TFAuth sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Metal Detector・EMF Reader ships an update weekly, TFAuth every 5 days. Both last shipped on October 25, 2026.

Scorecard1 real difference · 9 level
Metal Detector・EMF Reader versus TFAuth: the parameters behind the verdict, then further details
ParameterMetal Detector・EMF ReaderTFAuth
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyWeeklyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, Apple Watch — better
Requires iOS16.6 — better17.6
Further details — not scored
Size18 MB16 MB
Age rating4+4+
DeveloperYash MandhyanAlex Khalkho

In-app purchases

1 purchases

Metal Detector・EMF Reader

One-time1
  • Lifetime Access$2.99
2 purchases

TFAuth

One-time2
  • Pro$0.99
  • Pro+$1.99

Questions

Is Metal Detector・EMF Reader free?
Metal Detector・EMF Reader is free to download, with in-app purchases available.
Is TFAuth free?
TFAuth is free to download, with in-app purchases available.
Do Metal Detector・EMF Reader or TFAuth have ads?
Neither Metal Detector・EMF Reader nor TFAuth shows ads.
Which is updated more often, Metal Detector・EMF Reader or TFAuth?
Metal Detector・EMF Reader ships an update weekly, and TFAuth every 5 days. Most recently, Metal Detector・EMF Reader was updated on October 25, 2026 and TFAuth on October 25, 2026.

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