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.
Two things, and it tries to do both properly rather than a dozen badly: a building you can shape, and a site to put it on.
Bar, L, T, U, courtyard, stacked. Each is built from masses with their own size, floor count and base level, so a preset is a starting point rather than a template you are stuck inside.
Where two wings meet, the junction is found floor by floor. The internal elevation goes blank instead of being drawn twice, and the overlap is counted once in the area.
Click out the plot boundary, or trace it over a map or site plan you have scaled from two known points. Corners drag, and the boundary can be concave.
Place as many buildings on it as you like, rotate and drag them, and every metric and planning check follows as you move.
Driven by one number — the width of an apartment module — with everything else set against it, and any elevation free to differ from the rest.
None of it is cut out of a solid. Every opening is built as panels around the void, which is why the geometry stays clean enough to carry into another application.
Every figure is computed from the geometry on screen and recomputed as you change anything. These are the real numbers from one scheme — an L-plan block of eight floors on a 9 900 m² plot — with what each one is made of.
| Metric | Value | How it is arrived at |
|---|---|---|
| Footprint | 1 040 m² | The area the building covers at ground level. |
| GFA | 8 320 m² | Footprint across eight floors. Where two wings meet, the shared corner is counted once — a naive sum would report it twice. |
| Plot ratio | 0.84 | GFA ÷ plot area. 8 320 ÷ 9 900. |
| Coverage | 10.5% | Footprint ÷ plot area. 1 040 ÷ 9 900. |
| Core | 338 m² | Measured off the shaft that is actually in the model, not assumed as a percentage. 4.1% of GFA here. |
| NIA | 7 184 m² | (GFA − core) × an efficiency factor you set. (8 320 − 338) × 0.90. That is 86.3% of GFA. |
| Facade area | 4 464 m² | Total external wall, of which 33.7% is glazed on this scheme. |
| Units | 224 est. | An estimate, from the module width and the floor area. It is not a laid-out plan, and the app labels it as an estimate wherever it appears. |
| Tallest | 24.9 m | Height of the tallest mass, which is what a height cap is checked against. |
In the same pass, five planning limits — setback, separation, height cap, floor area ratio and coverage — are checked and reported with both numbers: the limit you set, and what the scheme does. A limit left at zero is off. Clashes between buildings and corners outside the plot are found here too, and the whole table exports as CSV.
In the order they are being worked on. No dates — these are what the work is pointed at, not commitments.
There is no IFC export today. Geometry comes out as glTF, which is a visualisation format: you can look at it, but you cannot pick a project up from it in Revit or ArchiCAD. IFC is what turns a study into the first step of a real job, and it is the next thing being built.
Bring a surveyed boundary straight in, instead of tracing it over a scaled image. The tracing workflow stays — it is faster when all you have is a screenshot of a map.
Placement currently handles buildings on a plot. Roads and parking belong in the same tab, so that coverage and the space between blocks start to mean something at the site scale.
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, CSV for the metrics, and JSON for the scheme itself, which reopens with everything as you left it. There is no IFC export yet — it is the next thing being built.
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.