Paste a rule and a sample to see which strings hit and whether the condition matches. Supports text/hex/regex strings and and/or/not + "N of them" conditions. Runs entirely in your browser.
Simplified engine: supports string/hex/regex matches with nocase, the $x at 0 offset check, N of them, all/any of them, and and/or/not with parentheses. It is a quick tester, not the full YARA grammar.