The biggest subwoofer box that fits your space, ready to cut.
Upload a 3D scan of the space. Set the plywood thickness, the smallest piece you are willing to cut and the driver you own. FitBox finds the largest buildable enclosure that fits and sounds right, then hands you the cut patterns, bevel angles and cost.
No account needed. Solving runs in your browser. Works on a laptop, an iPad or a phone.
From scan to cut list in ten steps
Drop in a 3D scan
STL or OBJ, parsed in your browser. Mesh issues are reported, floating fragments removed, and the scan stays on your machine.
Verify scale, close the cavity
Calibrate against one known measurement, auto-level the floor, cap the opening and mark obstacles, access points and other keep-outs.
Design around the driver
Pick a sub from the database, choose sealed or ported, and the target litres, tuning and port length come from its Thiele-Small parameters.
Solve for the biggest buildable box
Rectangular, convex or non-convex. Every panel respects your minimum edge, clearance, dihedral angle and bevel limits. Deterministic, seeded, verified against the full-resolution mesh.
Check it before you cut
Translucent overlay in the scan, clearance heatmap, section plane, exploded view, removability through the opening, weight and centre of gravity, predicted frequency response.
Export everything the build needs
Nested DXF and SVG, CSV cut list with bevel angles per edge, printable 1:1 templates, STL, cost estimate, bill of materials, assembly order and fastener schedule.
Tell it what you want in plain words
“Biggest box that fits, no piece smaller than 5 cm, flat bottom, 18 mm ply.” The parameters are echoed with units before anything runs; geometry always comes from the deterministic solver.