Observed arrival · 2026-09-21
Subcanvas, the whiteboard that keeps opening
A nested whiteboard for diagrams, notes, and repository maps, where boxes and arrows can each contain deeper material.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Developers mapping systems and teams organizing nested plans
- Worth noticing
- An optional .subcanvas file turns declared repository connections into arrows with descriptions.
Field notes
The interface models hierarchy directly: a folder, story act, course week, or system component can open into another sheet, with a tab trail leading back outward. For repository work, the importer uses folder paths and README files, while an optional .subcanvas file declares relationships such as a payments service connecting to a ledger over gRPC. The site also publishes an AGPL-3.0 self-hosting option.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue