Decato

Most interior tools stop at a picture. You arrange a room, it looks right on screen, and then you are on your own: figuring out what that sofa actually is, whether it is in stock, what it costs, and whether it even fits through the door.

Decato works the other way round. The floor plan comes first, so your room exists as a set of wall lengths and door swings before it is ever an image. Real, in-stock products are matched against those exact numbers, and anything that does not clear the walkways is dropped before you ever see it. What you get back is a priced list you can order from, plus a render assembled from those very products rather than invented ones — so what you see is what actually arrives.

It runs as a Mac app on macOS 12 or later, supporting both Apple Silicon and Intel, and no account is needed to install. Floor planning is unlimited and free: the planning agent runs on your own ChatGPT, Claude or Gemini subscription. Product matching and renders start at $20 a month. A Windows version is planned; there is currently no mobile app.