Rules
See what Canon checks, where each rule applies, and how severity changes by surface.
The Icosa writing standard
Write Icosa with one shared reference.
Browse the terms, notation, rules, and compositions that Canon currently defines—or check pasted writing without sending it to a server.
Check writingPaste text, choose its format and surface, and get deterministic findings in your browser.Browse CanonExplore 854 registered terms, 1 rule, and 4 composition forms.
Use the reference
Notation
Start with the forms that represent cells, states, magnitudes, and compositions.
Compositions
Read the authored operand, ordering, result, and decomposition contracts.
For LLMs
Give an agent a stable guide to deterministic checking and the Canon references.