Draw a plot, place buildings on it, and change a slider to rebuild any of them — massing, a facade with real openings, and metrics that show their working.
Free. No account, and nothing is uploaded.
Six footprints — bar, L, T, U, courtyard and stacked — each composed from masses with their own size, floor count and base level.
Where two wings meet, the junction is detected floor by floor, so an internal elevation goes blank instead of being drawn twice.
Window rhythm comes from the module width, so the bays always divide evenly across an elevation rather than leaving a remainder at one end.
Openings are real geometry, with reveals and sills, and balconies are either projecting slabs or recessed loggias.
Draw the plot boundary, or drop in a map or site plan, set its true scale from two known points, and trace over it.
Place as many buildings as you like, rotate and drag them, and watch clashes, off-plot corners and five planning rules as you go.
This is the part a massing tool usually skips, and it is the reason the output is worth looking at. Reveals have jambs. Loggias have cheeks and a soffit. Every elevation can be overridden on its own, so the street face need not match the courtyard face.
None of it is cut out of a solid. Openings are built as panels around the void, which keeps the geometry clean enough to carry into another application.
GFA, NIA, facade area, footprint, coverage, plot ratio and a unit estimate, all recomputed as you change anything. Where two wings overlap at a junction, the shared area is counted once rather than twice.
NIA takes the core off the geometry that is actually there, then applies an efficiency factor you set — it is not a percentage guessed at the end. The unit count is an estimate from the module width, and the app says so where it shows it.
Setback, separation, height cap, floor area ratio and coverage are checked in the same pass and reported with both numbers: the limit, and what the scheme does. A limit set to zero is off, so nothing inherits a rule nobody asked for. The whole table exports as CSV.
Real openings with reveals and jambs, loggias with cheeks and soffits, and per-elevation overrides. Most tools at this stage give you a box with a texture on it.
Every choice that could be random runs through a seeded generator, so a scheme rebuilds byte for byte. When the job is comparing options, that is the difference between a comparison and a coincidence.
It is a static page. There is nothing to sign up for, nothing to upload, and once it has loaded it keeps working without a connection. Schemes are files on your own machine.
Every figure comes from the geometry on screen, and the corrections — the junction overlap, the core area — are ones you can check by hand.
Worth knowing before you spend an afternoon in it. None of these are hidden in the app either.
Click out a boundary, or drop in a map or site plan, set its scale from two known points, and trace over it.
Add buildings, drag and rotate them, pick a footprint, then work the sliders — floors, depth, module, balconies, cores.
Export the geometry as glTF, the metrics as CSV, and the whole scheme as a JSON file you can reopen later.
No. There is no sign-up, no login and no trial. Open the page and it is there.
Nowhere. There is no backend to send it to. Everything is computed in your browser, and a scheme is saved by downloading a JSON file to your machine. The site you are reading sets no cookies and makes no third-party requests.
Once the page has loaded, yes — the app keeps working with the network gone, because nothing it does needs a server.
glTF for the geometry, including the whole site with its buildings named; CSV for the metrics table; JSON for the scheme itself, which reopens with everything as you left it. There is no IFC export yet.
Yes, and there is no pricing page to read. It is a static page with no running cost behind it beyond hosting.
No. It is parametric: you set the numbers and the geometry follows from them, the same way every time. The name is short for urban generator, and that is as far as the word goes — nothing here learns, predicts or invents.
It takes about a minute to find out whether it suits the way you work.