Show HN: WallHang – Plan a gallery wall and get exact nail positions (iOS)

WallHang is an iPhone app for planning gallery walls and turning a frame arrangement into a practical hanging plan. Users enter wall dimensions in centimeters or inches, then add frames using their real outside measurements or common preset sizes. They can choose a linear, gallery, or salon-style starting layout and adjust it by dragging, snapping, and spacing frames on a scaled wall view. The app is designed to handle the measurements so users can focus on how the arrangement looks.

For each frame, users specify its hanging hardware - such as wire, D-rings, or a single hook - and WallHang calculates the support-point coordinates from the floor and the wall’s left edge. The free version supports one wall with up to four frames and includes on-screen measurements. A one-time $7.99 Pro purchase adds unlimited walls, up to 20 frames per wall, printable or shareable PDF measurement sheets, AR previews, and Family Sharing. No account is required, and the app says it contains no ads or tracking, with data kept on the iPhone. AR and photos are visual references, not measurement tools; users should verify marks before drilling and select fixings appropriate to the wall and frame weight.