Observed arrival · 2026-11-10
Tangibool makes Boolean rules testable
A browser-based workspace for drafting, checking, explaining, and testing Boolean logic in plain language, formulas, or diagrams.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People drafting or checking Boolean rules
- Worth noticing
- A worked example compares two access rules across all eight assignments and identifies the two cases where they differ.
Field notes
The example uses three inputs—member, invited, and banned—and enumerates all eight possible assignments. The page says differing cases can be replayed in its evaluator and saved as regression tests; it also describes an offline, signed-out browser mode, with rules kept on-device unless the user chooses cloud storage. The homepage lists 14 open lessons and support for 13 file types, from Markdown and LaTeX to Python, SQL, and SMT-LIB.
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
One card from the complete issue