tldraw
A whiteboard for diagrams, flowcharts and rough sketches that opens instantly with no account.
Cost
Completely free
Free to use in the browser. Boards live in your browser unless you choose to share them.
Open source
Yes
The code is public. Anyone can inspect it, and it cannot be taken away from you.
Your data
Stays on your computer
Nothing is uploaded. This matters for anything confidential.
Use it for this
Drawing the thing you are trying to explain — a process, a structure, how three teams connect. Faster than describing it in three paragraphs.
Do not use it for this
Precise design work or final artwork.
A moment where you would reach for it
Sketching how a form's approval steps actually work, to check you understood it correctly.
How hard is it to pick up?
Anyone can use this on day one.
Worth knowing before you use it
Works offline in the browser and stores locally by default. Nothing leaves your machine unless you explicitly share a board.
Other things that do this job
No tool is best at everything. These solve a similar problem, with different trade-offs.
About this entry
Checked on 1 Sept 2026. Prices and free limits change without warning, and often quietly. Treat everything above as a starting point and confirm on the official site before you rely on it.
Nothing here is sponsored. A tool appears because it solves a real problem, not because someone paid for it to be listed.