Spline

The homepage doesn't describe a 3D tool — it is one. The hero is a live, draggable 3D scene of floating shapes over near-black, so the first proof of "you can build interactive 3D in the browser" is the page reacting under your cursor, before a line of feature copy has loaded. Below, the dark canvas lets the work glow. A feature grid of real editor screenshots, a giant rendered 3D object as a section break, and bands on real-time collaboration and templates each answer "what would I actually make?" with a rendered artifact instead of a bullet. It keeps the abstract promise — "the all-in-one platform for 3D and design" — concrete the whole way down a very long page. The restraint is choosing dark and quiet so the color lives in the renders, not the chrome — the exact opposite of Gumroad's strategy, and the right call for a creative tool whose value is visual. The lesson: if your product makes something, make the landing page out of that something. A working demo in the hero beats any screenshot of one.