Comparison

Metal Detector・EMF Reader vs Span64

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

Span64

Features
Read full description

Exact trade math. Offline. Yours once. Span64 is an exact feet-inch-fraction Calculator for carpenters, framers, contractors, and serious DIYers. Enter full equations, read stacked fractions clearly, convert between imperial and metric, and keep completed work on a persistent Tape. THE CALCULATOR IS FREE The Calculator is free. Jobsite Tools require a one-time unlock. Add, subtract, multiply, and divide dimensions without ads. Calculator equations and results stay available on your Tape so you can reuse or share them later. SPAN64 PRO: SEVEN JOBSITE TOOLS • Triangle / Right-angle • Area & Volume • Concrete • Board Feet • Stairs • Roof / Rafter, including common-rafter birdsmouth • Studs / On-center Preview every locked Tool with your own measurements before purchasing. A single non-consumable purchase reveals useful numeric results and unlocks all seven Tools forever. There is no subscription, trial countdown, or account. BUILT FOR REAL WORK • Exact domain math to 1/64 inch • Tolerant feet-inch input • Imperial and metric output where applicable • Persistent Tape with notes and reuse • Clear stair checks and focused jobsite forms • Works without a signal after installation Purchasing or restoring Span64 Pro requires a network connection so the App Store can verify ownership. Restore Purchases is available from Settings and the Span64 Pro screen. Your measurements, equations, results, Tape entries, and notes stay on your device. Optional telemetry is off by default and never includes calculation content. Span64 is a calculation aid. Verify measurements, structural decisions, and local code requirements before cutting or building.

Screenshots

Metal Detector・EMF Reader3 screens
Span644 screens

Verdict

The call

The clearest difference is iOS requirement: Metal Detector・EMF Reader at 16.6 against Span64's 18.0. 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 Span64 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

Scorecard1 real difference · 9 level
Metal Detector・EMF Reader versus Span64: the parameters behind the verdict, then further details
ParameterMetal Detector・EMF ReaderSpan64
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhoneiPhone, iPad — better
Requires iOS16.6 — better18.0
Further details — not scored
Size18 MB30 MB
Age rating4+4+
DeveloperYash MandhyanRoberto Garrido

In-app purchases

1 purchases

Metal Detector・EMF Reader

One-time1
  • Lifetime Access$1.99
1 purchases

Span64

One-time1
  • Span64 Pro$19.99

Questions

Is Metal Detector・EMF Reader free?
Metal Detector・EMF Reader is free to download, with in-app purchases available.
Is Span64 free?
Span64 is free to download, with in-app purchases available.
Do Metal Detector・EMF Reader or Span64 have ads?
Neither Metal Detector・EMF Reader nor Span64 shows ads.
Which is updated more often, Metal Detector・EMF Reader or Span64?
Metal Detector・EMF Reader ships an update weekly, and Span64 weekly. Most recently, Metal Detector・EMF Reader was updated on October 12, 2026 and Span64 on October 4, 2026.

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