Will the sofa actually fit?
Draw your room to size, furnish it from a library of real-world objects, and walk through it in 3D. Then let it check the thing nobody measures until it is too late: whether the door still opens, whether you can get past the bed, and whether the dishwasher can be pulled out at all.
No account needed to start. Nothing is uploaded unless you ask it to be.
Measured, not sketched
Every wall has a real length, thickness and height. Every object is the size the real one is. That is what makes the answer worth anything.
Draw the room
Corner by corner on a snapping grid, or start from a rectangle. Type a dimension while you draw, or set it afterwards. Metric or imperial — 3.6 m, 360cm, 11' 9" all work.
Doors and windows, cut in
Openings go through the wall rather than sitting on it, with width, height, sill and offset all editable — and door swings you can flip, because which way a door opens decides half the layout.
About 105 real objects
Beds, sofas, worktops, wardrobes, baths, desks. Resize any of them and the model actually reshapes — furniture is generated from its dimensions, not scaled from a fixed mesh.
Walk it in 3D
An orbiting doll's-house view where the near walls melt away, and a walkthrough camera at eye level with wall collision. Tap anything to select and edit it, right there in 3D.
The fit check
The point of the name. Overlaps, furniture through walls, blocked door swings, and appliances with no room to open. It tells you what will not work before you buy it.
Start from a photo Plus
Point the camera at a floor plan — on paper, in a listing, sketched on squared paper — and its walls and doorways are traced into an editable room. It runs on the device; the picture never leaves it.
It works on a plane
Won't Fit is a tool first and a service second. Rooms are saved on your device and the whole app runs there — the 3D, the fit check, reading a plan out of a photograph. An account only adds the ability to carry your rooms to another device.