Find the best metal detector app with no ads for Android and iPhone. Wall Scanner & Metal Detector is free, offline, no account needed. Honest about what it detects.
Finding a
It's available on both
Your smartphone contains a magnetometer — a sensor that measures the local magnetic field strength in microtesla (µT). This is the same sensor used for compass and navigation apps. A metal detector app reads from this sensor continuously and displays changes in field strength.
When a metal object (iron, steel, nickel, or any ferromagnetic material) comes close to the phone, it distorts the local magnetic field. The app displays this distortion as a rising value on a graph or meter. The closer the metal, the larger the distortion.
Important accuracy note: smartphone magnetometers are most sensitive to
Not "reduced ads" or "ad-free after watching a video." Zero ads. No banner at the bottom, no interstitial between scans, nothing. The screen is entirely devoted to sensor data. This matters enormously when you're actively working and need to watch the readings carefully.
The app works in airplane mode. This is critical for use in basements, old buildings, outdoor locations, or anywhere with poor connectivity. Many ad-supported apps require network connectivity to serve ads — making them useless in offline scenarios. Wall Scanner & Metal Detector has no such dependency.
Download, open, scan. No email required, no sign-up form, no permissions beyond basic sensor access. This is how utility apps should work.
The app includes:
The app doesn't claim to detect gold coins at 10 meters. It shows real magnetometer readings and lets you interpret them. This transparency is refreshing compared to apps that make exaggerated claims while hiding their limitations in fine print.
Be realistic about limitations. A smartphone magnetometer cannot:
Detect non-ferrous metals (copper, aluminum, gold, silver) reliably
Pinpoint metal at depths beyond a few centimeters through concrete or soil
Discriminate between metal types (a nail and a rebar create similar signals)
Match the sensitivity or depth range of a dedicated handheld metal detector
For treasure hunting, archaeology, or professional inspection, a dedicated hardware metal detector is required. For everyday household tasks, the phone app is excellent.
Most free metal detector apps on the App Store and Google Play monetize through:
Ad banners covering part of the display
Interstitial video ads that play every 2–3 scans
Paywalled "pro" features that include basic functionality
Subscription fees of $5–10/month for ad-free access
Ready to scan? Download
It takes under a minute to install and start detecting. Whether you're a homeowner, a hobbyist, or a tradesperson who just needs a quick check, this is the cleanest, most honest free metal detector app available in 2026.