PenEcho

Write across twenty thousand squares and summon knowledge

Ready
PenEcho

Start a new canvas?

Save confirmed content before starting over. Unconfirmed AI drafts are not included.

Markdown + LaTeX

Type normally; Markdown and likely LaTeX are formatted automatically when confirmed. Preview shows the result.

  • Use # for headings, - for lists, **text** for bold, and *text* for italic.
  • Common bare TeX such as \pi, \frac{a}{b}, A_x, and \sin(x) is recognized without $ delimiters.
  • Press Ctrl/Cmd + Enter to confirm.

Example

# Kinematics
**Speed:** $v=\frac{d}{t}$
- Area: $A=\pi r^2$
Stylus writes · finger pans · pinch zooms · wheel zooms · middle or Alt drag pans