Wallrap
Dienstprogramme
0,99 € · Entwickelt für iPad. Nicht für macOS überprüft.
Wallrap is an acoustic stud finder. It teaches your iPhone the carpenter's knock test — rap the wall, listen for the pitch shift, know whether you're tapping over a hollow drywall cavity or a solid stud underneath.
THE TECHNIQUE
Walls over a stud sound brighter and shorter. Walls over a hollow cavity sound lower and longer — like a small drum. A trained ear can hear it instantly. Wallrap measures it for you.
HOW IT WORKS
Wallrap listens through your iPhone's microphone, detects each knock by its amplitude envelope, takes a 50 ms FFT snapshot of the sound, and computes two features that separate hollow from solid: the spectral centroid (where the energy is) and the low-band-energy ratio (50–500 Hz vs everything up to 4 kHz). The classifier maps each knock onto a hollow → solid axis and reports HOLLOW, EDGE, or SOLID with a soft confidence ring.
CALIBRATION
Different walls (drywall, plaster, paneling, tile) ring differently. Calibrate once per wall: tap a place you know is hollow drywall, then tap a place you know is a stud or door frame. Wallrap learns your reference and uses it for every later knock. Recalibration takes about 15 seconds and is stored locally on your device.
TAP-AND-TRACE MODE
Hold your phone vertically and slide it slowly across the wall, knocking every couple of inches. Wallrap records the sequence and draws a horizontal strip showing the inferred stud locations — amber bands for solid, slate bands for hollow, purple bands for the edges where it's not sure.
WHAT WALLRAP DOES NOT DO
Wallrap is an estimate, not a precision instrument. It will not find every stud in your wall with sub-centimeter accuracy. It can be fooled by noisy environments, inconsistent knocking, very thick walls, plaster-on-lath, and metal studs. Confirm with a drill pilot hole or a hardware stud finder before driving large fasteners.
PRIVATE BY DESIGN
- No accounts, no ads, no analytics, no tracking, no subscription
- Audio is processed live on device and never recorded or uploaded
- Your calibration profile is stored on this device in UserDefaults
- Microphone permission is requested only when you tap Listen, Trace, or Calibrate; you can revoke it at any time in Settings → Privacy
ACCESSIBILITY
- VoiceOver labels on every interactive control
- Dynamic Type-friendly typography (system SF Pro rounded)
- Variable-intensity Core Haptics on every classified knock (stronger and crisper for solid, softer for hollow)
- Dark mode primary; cool slate base with warm amber accent
REQUIREMENTS
- iOS 17 or later
- iPhone or iPad with a working microphone
- $0.99 one-time purchase, no in-app purchases
Wallrap is a single-purpose utility for the DIYer who'd rather knock once than guess. Calibrate, listen, knock, build.
Bewertungen & Rezensionen
- Diese App hat noch nicht genügend Bewertungen oder Rezensionen erhalten, um eine Übersicht anzuzeigen.
Das Entwicklungsteam, Robert Corbin, hat darauf hingewiesen, dass die Datenschutzrichtlinien der App den unten stehenden Umgang mit Daten einschließen können. Weitere Informationen findest du in den Datenschutzrichtlinien des Entwicklungsteams .
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Informationen
- Größe
- 3,6 MB
- Kategorie
- Dienstprogramme
- Kompatibilität
Erfordert iOS 17.0 oder neuer.
- iPhone
Erfordert iOS 17.0 oder neuer. - iPad
Erfordert iPadOS 17.0 oder neuer. - Mac
Erfordert macOS 14.0 (oder neuer) und einen Mac mit Apple M1-Chip (oder neuer). - Apple Vision
Erfordert visionOS 1.0 oder neuer.
- iPhone
- Sprachen
- Englisch
- Altersfreigabe
4+
- 4+
- Anbieter
Robert Corbin
- Robert Corbin hat sich nicht als Händler für diese App ausgewiesen. Falls du Verbraucher:in im Europäischen Wirtschaftsraum bist, gelten die Verbraucherrechte nicht für Verträge zwischen dir und dem Anbieter.
- Copyright
- © 2026 Robert Corbin
