RebuttalKit is a free English-language browser worksheet for digital sellers and service businesses organizing chargeback records. It collects a response deadline, transaction timeline, reason-specific evidence checklist and exhibit map, with missing evidence kept visible. No account or customer-record upload is required; drafts use browser local storage. A fictional demo and free two-page sample are included. The organizer is free, with a separate optional US$19 one-time Markdown/CSV prevention kit. It does not submit disputes or guarantee an outcome.