Comparison

PaperVault vs Metal Detector・EMF Reader

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

Head to head
About

PaperVault

This app securely stores your digital information by converting it into printable QR codes. It uses strong encryption and keeps all data local, offering a reliable offline backup solution that combines the longevity of paper with digital security.

Highlights
  • QR code data storage
  • Password protection
  • Robust encryption
  • Local data storage
  • Printable data format
  • Offline data backup
Read full description

PaperVault stores information as sequences of QR Codes you can print and scan easily, protected by a password only you know. Data is secured using industry-standard robust encryption algorithms, and always local. PaperVault does not depend on any cloud service. PaperVault combines the long-term reliability of printed documents with the security offered by digital storage. You could keep data in hard drives and pen drives, but will they work a few years from now, when you need them the most? Or print your sensitive data, but what if anyone reads it? Now you can have the best of both worlds! PaperVault will print easily scannable encrypted data on paper you can store anywhere. Enjoy the peace of mind of knowing paper wont break like electronics does, and your information will be secured with strong encryption algorithms. Use PaperVault to keep data offline, secure, and readable only by you. That cloud backup service password you wont remember when your computer breaks? PaperVault it! Sensitive information you don't want hacked away from your computer? PaperVault it! PaperVault security and data format are public. Check PaperVault website for details.

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/

Screenshots

PaperVault4 screens
Metal Detector・EMF Reader3 screens

Verdict

The call

The clearest difference is review sentiment: Metal Detector・EMF Reader at 100% against PaperVault's 50%. Metal Detector・EMF Reader also leads on update cadence (weekly vs every 3 months) and iOS requirement (16.6 vs 18.0). PaperVault's advantage is in-app purchases (none vs 1). On price, ads, monetization model 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. Metal Detector・EMF Reader sells 1 one-off in-app purchase. PaperVault asks for nothing beyond the download.

UpkeepUpdate frequency

PaperVault ships an update every 3 months, Metal Detector・EMF Reader weekly. The most recent releases landed on June 1, 2026 and August 9, 2026 respectively.

Scorecard4 real differences · 6 level
PaperVault versus Metal Detector・EMF Reader: the parameters behind the verdict, then further details
ParameterPaperVaultMetal Detector・EMF Reader
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings—2 — better
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, Mac — betteriPhone
Requires iOS18.016.6 — better
Further details — not scored
Size20 MB18 MB
Age rating4+4+
DeveloperMiguel Barreto da Silva ArrozYash Mandhyan

Customer experience

PaperVault

Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

Metal Detector・EMF Reader

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

PaperVault

No in-app purchases

1 purchases

Metal Detector・EMF Reader

One-time1
  • Lifetime Access$1.99

Questions

Is PaperVault free?
PaperVault is free to download, with no in-app purchases.
Is Metal Detector・EMF Reader free?
Metal Detector・EMF Reader is free to download, with in-app purchases available.
Do PaperVault or Metal Detector・EMF Reader have ads?
Neither PaperVault nor Metal Detector・EMF Reader shows ads.
Which is updated more often, PaperVault or Metal Detector・EMF Reader?
PaperVault ships an update every 3 months, and Metal Detector・EMF Reader weekly. Most recently, PaperVault was updated on June 1, 2026 and Metal Detector・EMF Reader on August 9, 2026.

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