MagStud Pro

A wall-scanning workbench that uses your iPhone's magnetometer and sensors to help reveal studs, fasteners, live-wire zones, rebar, and buried wall features — all offline, no account, no ads.

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Why MagStud Pro

Most stud-finder apps show a single bar and a beep. MagStud Pro goes deeper: live microtesla readings, a drill-safe zone strip, Goertzel-DSP live-wire hum detection, rebar density analysis, a private scan journal, and now a measured stud diagram you can export and share — all computed on-device, zero network.

No Strings Attached

No account required
No ads or subscription
No network calls
No tracking or analytics
All data stays on your device

Detection Tools

Sweep Live magnetometer meter with calibrated ambient offset, edge-filtered peak detection, and threshold haptics/audio
Heatmap Pan the phone across the wall to paint a 12×8 magnetic heat-map grid — NEW in 1.3 export the grid as a shareable PNG with per-cell µT readings labeled
AC Detect Goertzel-DSP narrowband filter for 50/60 Hz live-wire hum — switchable between North American and European grid frequencies
Joist Spacing Mark two stud peaks; the app projects all future centers and identifies standard framing (16/19.2/24 in. o.c.)

Pro Tools

Outlet Finder Combines a magnetic-edge peak and a 60 Hz AC peak within a coincidence window to flag buried outlet and switch boxes
Drill Safe 24-cell risk strip with per-cell magnetic and AC reading; exportable as PNG
Rebar Density 30-second concrete sweep; histograms peak gaps to estimate rebar on-center spacing
Wall Type 6-second capture classifies Drywall / Lath & Plaster / Concrete from mean, variance, and high-frequency features
Anomaly Log Drop pins on hot spots with magnitude and optional coordinate; export as CSV
Framing Ref Offline IRC 2024 framing standards, lumber actual dimensions, joist spacings, and safety notes. Includes a stud-spacing calculator: enter two stud positions and wall width to project every center across the wall.
NEW — Stud Sketch Mark stud peaks during a sweep; the app builds a scale wall diagram annotated with each stud's exact position in inches and the gap between adjacent studs. Tap Render to export a shareable PNG — the document you hand to a contractor or take to the hardware store.

Scan Journal

Every scan session is saved with mode, timestamp, wall notes, optional photo, ambient offset, peak reading, and all marked detections. Attach voice memos to individual detection hits. Export any session as a formatted PDF report — shareable directly from the journal.

Version 1.3 — What's New

Stud Sketch (new Pro tool) — mark stud peaks, get a measured wall diagram, export as PNG
Heatmap PNG Export — save and share the 12×8 heatmap grid with labeled cell values

Last updated: June 17, 2026

Safety Notice

MagStud Pro is a sensing aid, not a replacement for proper electrical safety tools. Always verify with a contact voltage tester and appropriate trade practices before drilling. The app detects magnetic signatures from fasteners and AC hum — it cannot see pipes or cables directly.