iPhone

Stud finder app for iPhone

Your iPhone already has the sensor a stud finder needs. Stud Finder is a free iPhone stud finder app that reads the built-in magnetometer to locate the metal fasteners in each wall stud — no extra hardware, no signup, no subscription.

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Why iPhone is the right phone for a stud finder app

iPhones have used the same three-axis magnetometer family for a decade, calibrated by Apple for the Compass and ARKit. That consistency matters: a magnetometer-based stud finder depends on a stable, well-characterized sensor. On Android the magnetometer varies across thousands of device models, which is why a reliable cross-platform stud finder app is hard to build.

Compatible iPhone models

Stud Finder works on iPhone 8 and every iPhone released since — iPhone SE (2nd and 3rd generation), iPhone X, XR, XS, 11, 12, 13, 14, 15, 16, and newer, across every storage and carrier variant. All of them include the magnetometer the app requires.

How to use the app on your iPhone

Open the app. No setup, no calibration, no account.
Hold the iPhone flat against the wall, screen facing you.
Sweep slowly side to side — a few inches per second is ideal.
Watch for the magnetometer peak. That's a fastener in the stud.
Sweep from both directions and mark where the peaks align. That's your stud center.

iPhone-specific tips

Remove MagSafe. MagSafe wallets, chargers, and magnetic mounts will saturate the magnetometer and ruin the reading.
Avoid metal cases. Plastic, silicone, and leather are fine; thick metal cases cause false peaks.
Hold the phone flush. The magnetometer drops off sharply with distance — even half an inch of air gap weakens the signal.
Start near an outlet. Outlets are almost always mounted directly to a stud, so they're a perfect sanity check for the reading.

When an iPhone stud finder isn't enough

For heavy mounts — large TVs, full-length mirrors, heavy shelves — use the app and a hardware capacitive stud finder together. The two tools measure different things (the app finds fasteners, the hardware finder measures wall density), and only drilling where both agree is the safest workflow. See the hardware vs app guide for the full comparison.

Questions about the iPhone stud finder app

Is there a stud finder app for iPhone?

Yes. Stud Finder is a free iPhone app that uses the magnetometer built into every modern iPhone to detect the metal fasteners that anchor drywall to wall studs. No extra hardware required.

Which iPhone models support a stud finder app?

iPhone 8 and newer running a recent iOS version. Every iPhone shipped in the last decade has the three-axis magnetometer the app needs — it's the same sensor the Compass app uses.

Does the iPhone stud finder app work with a case?

Most plastic, silicone, and leather cases are fine. Remove any case with a magnet — MagSafe wallets, magnetic car mounts, thick metal cases — because they interfere with the magnetometer reading.

How accurate is an iPhone stud finder app?

On standard drywall-over-wood construction it reliably finds studs within a quarter inch of their actual position. Accuracy drops on lath-and-plaster walls, through thick tile, or on steel-stud commercial construction.

Can I use the iPhone stud finder through tile?

Through thin decorative tile over drywall, usually yes. Through thick tile or cement-board backer the signal weakens noticeably — expect less precise results or use a hardware finder instead.

Does the iPhone stud finder app work offline?

Yes. All detection runs on-device. No internet connection, no account, no data leaves the phone.

Install on your iPhone — free

No signup. Works offline. Uses only the sensor your phone already has.