isketch vs tldraw

Different tools for different jobs. Here is where tldraw is the better choice, and where isketch adds something it does not.

Where tldraw is better

A superb canvas SDK: if you are building a drawing tool, it is the one to build on.
Arrows and shapes that behave beautifully under manipulation; multiplayer by default.
An ecosystem of experiments (computer, copy-paste-as-URL) that show what a canvas can be.

isketch is a sketchpad whose output is agent-ready: the diagram is text a coding agent reads exactly, and can edit back.

Built for the step after the sketch: handing the design to a coding agent as structured text it can act on and write back.
Domain imports that matter to code (docker-compose, OpenAPI, SQL DDL, draw.io), not just drawing.
Diagrams as files you own, with a diff a reviewer can read.

tldraw is good at what it does, and you can bring your tldraw diagrams along: the converters run in your browser.