Kairos Playground
Evaluate Kairos expressions in the browser (the reference implementation runs as is — nothing is sent to any server). The language is at the RC (release candidate) stage — see the language spec and the descriptor reference; the workbooks and sample questions are in Japanese.
Results appear here.
The evaluation range is the half-open interval
[from, to) — from is included, to is excluded. In the
output, # ⚠ marks annotations of out-of-range provenance and
# coverage summary reports the data runway
(spec §4.10). "Pin to URL" produces a shareable link
carrying the expression and range. Messages produced by the evaluator itself — syntax errors and
annotation texts — appear in Japanese, the implementation's canonical output language; the
English spec defines their exact semantics.