What does Papermark do?
Papermark is an open-source document sharing and data room platform, positioned as a self-hostable alternative to DocSend. It offers secure share links with custom domains, access controls, watermarking, and built-in per-page viewing analytics, used mainly by founders sharing pitch decks and by teams running due-diligence data rooms. Founded by Marc Seitz in 2023, it is bootstrapped and reported roughly $900K ARR without outside funding.