SignFlow is described as 'Digital signatures utilises the latest integrated personal X.509 digital certificate technologies to sign documents and embed authentication. User accounts, private keys and digital certificates are centrally created, stored and managed in our world-class PKI with' and is a E-signature tool in the office & productivity category. There are more than 25 alternatives to SignFlow for a variety of platforms, including Web-based, SaaS, iPhone, iPad and Android apps. The best SignFlow alternative is DocuSeal, which is both free and Open Source. Other great apps like SignFlow are OpenSign, LibreSign, Docusign and DottedSign.