ColorPairLabWhat to include in a bug report
For a calculation issue, note the exact input strings, displayed ratio, four contrast results, page path and browser version. For an export issue, say which format was affected and include a small sample without private palette names or notes.
Email support
Email support@colorpairlab.online with your question or bug report. This page has no message form; opening an email link lets you review and send the message in your own email app.
Find help in the docs
The documentation covers input formats, matrix controls, exports and storage. The methodology page explains the formulas and limits, with known examples you can compare against your result.