Sketch a base, draw the crease pattern, and fold it to see whether it works — all in one place, with no account. Open it in a browser tab, or install the desktop app.

Draw with a full set of construction and transform tools, snapped to the grid and to angles, and see foldability problems the moment you make them. Reference photos, notes and a folded preview all live on the same canvas.
Draw, simulate, and solve origami models with non-flat creases.
Put a reference photo of the subject next to the paper and annotate the canvas with rich text. Both are saved with the project and dropped cleanly when you export to a format that has no room for them.
Kawasaki and Maekawa where the paper folds flat. Where it does not, each vertex is checked in three dimensions — walking its creases around to see whether the folds close back up, and by how far they miss.

Pack your model with whichever method suits it, with several designs open side by side in tabs. Each one builds a crease pattern you can send straight to the editor.
Open a simulation in a window right next to the crease pattern you are drawing, so checking an idea costs a glance instead of a round trip through another program. A full Simulate workspace is there when you want the model on its own.

Much of Ori Studio is a careful port of work the community already built — Oriedita, TreeMaker and Box Pleating Studio — and keeping import and export interoperability with those tools is a commitment.
Ori Studio runs entirely in your browser, but if you prefer, you can install it as a desktop app.