Made to Fit

Photograph the space for a first sketch, confirm every size with a tape, pick a design, and get exact cuts, build steps and a supplier-ready order.

Static site: index.html, styles.css, app.js, assets/, plus one serverless function, api/assistant.js, for the design assistant. No build step.

The flow

1. Space: pick what you are making, add a photo, take a first guess at the sizes on the photo (bank card or A4 for scale) or with AR on Android, then confirm each size with a tape. The order pack only goes out once every size is confirmed.
2. Design: material, doors, compartments (upright dividers), shelves per compartment, joinery (screws, pocket screws, cam and dowel). Preview on your photo with a before/after slider, as a dimensioned drawing, or in 3D.
3. Cut list: every panel, sheet layouts, timber lengths, hinge holes, hardware. Sizes can be edited.
4. Build: an IKEA-style picture manual (lettered parts, actual-size hardware, exploded assembly drawings, printable as PDF) plus a step-by-step text guide.
5. Order: itemised estimate, an order pack (cut list CSV plus a DXF with true shapes and every hole to drill), and "Send to a cutter": what to ask a UK cutting service for, given what the design needs (angled cuts, drilling, edging), with a pre-filled quote email. Named cutters (SUPPLIERS in app.js) are hidden until they agree to be listed; set NAME_CUTTERS to true to show them. The file format is described for partners in docs/ORDER-PACK.md.

Templates: under-eaves cupboard, under-stairs cupboard (tall end left or right, every upright, top and door cut to the stair angle), wardrobe, open shelving, kitchen base, wall cupboard, plus stud wall, partition, floor joists, flat roof and pitched roof.

Built as boxes

Long furniture is split automatically into separate boxes. How big a box can be depends on where it is going (ground floor 2400mm, upstairs 1800mm, loft or attic 1200mm: the longest panel you can carry in), and every panel, including sloped tops and 3mm backs, must also fit its sheet. This works like kitchen units: each box is a complete carcass (two sides, top, bottom, back) that fits on one sheet and up the stairs. Boxes are joined in place with cabinet connector screws. The number of boxes can be set by hand. The cut list, fittings (screws per joint, connectors, panel pins per back, brackets, packers), drawings and the picture manual all follow the boxes: build one box, make N, join them, fix to the wall.

Safety checks

Every furniture design is checked as you edit it: shelf sag over time (beam formula with Eurocode 5 creep), shelf strength, load per shelf pin, back panel against racking, and wall fixing. Failing checks offer a one-tap fix (more compartments, thicker board, plywood). The rules, figures and sources are in docs/SAFETY.md for professional review. Building work (walls, joists, roofs) is not checked and shows a stop notice.

The picture manual animates each step: parts slide into place, with a pause button, and stays still for reduced motion and in print.

Design assistant ("Change it")

Type what is wrong in plain English ("make it five compartments with two shelves each, no doors") and the design updates. The request and the design sizes go to api/assistant.js, which asks Claude (Haiku 5.5 through Vercel AI Gateway, structured JSON output) for a list of setting changes or an answer to a building question. The browser validates every change again before applying it.

To switch it on in Vercel:

1. It calls Claude through Vercel AI Gateway, billed to the Vercel account. On Vercel it signs in with the deployment's own token, so no API key is needed: enable AI Gateway for the team (AI Gateway in the Vercel dashboard) and redeploy. AI_GATEWAY_API_KEY is only needed to run it outside Vercel.
2. Set a spend limit for AI Gateway in Vercel. The function also rate-limits each visitor, accepts same-origin requests only and caps message length.

If AI Gateway is not enabled or the AI is unreachable, a built-in phrase parser handles the common requests (compartments, shelves, doors, sizes, board, joining) so the button still works.

Design system

• Type: General Sans (display) and Satoshi (body) from Fontshare, JetBrains Mono for measurements.
• Colour: cool neutrals with one accent, hi-vis orange #FF5B1F. Dark text on the accent for contrast.
• Shape: surfaces 12px radius, every button and chip a full pill.
• Light and dark themes follow the system, with a manual toggle.
• Icons: Phosphor (regular).

UX patterns referenced on Mobbin: Zillow virtual staging (before/after slider, shown on a drawn 3D loft), Cal AI and Quizlet capture tips, IKEA camera framing, IKEA and LARQ step-by-step setup, Stripe split configurator with live preview, Instacart and Amazon checkout summaries.

Privacy and security

• Photos are processed in the browser and never uploaded or stored. The assistant only receives the typed request and the design sizes.
• Projects are stored in localStorage on the device only and validated on load.
• Strict Content Security Policy (no inline scripts or handlers), Subresource Integrity on the icon stylesheet, escaped output everywhere, spreadsheet formula injection guarded in CSV exports.

Hosting headers are set in vercel.json (frame-ancestors and HSTS cannot be set from a meta tag). On another host, send:

Content-Security-Policy: frame-ancestors 'none'
Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
X-Content-Type-Options: nosniff
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: camera=(self), geolocation=(), microphone=(), xr-spatial-tracking=(self)

Credits

The home page loft scene and the design tile drawings are pencil sketches drawn in code (heroScene() and tileSketch() in app.js). Photos in assets/ are from Unsplash: eaves storage (step-snap.jpg) by Lisa Anna, loft conversion (step-design.jpg) by Brett Jordan, table saw (step-cut.jpg) by Blaz Erzetic, woodwork (step-build.jpg) by Samuel Cruz.

Prices are estimates. Always check measurements before you order.