SignNow is an e-signature product owned by airSlate, Inc., a private no-code document-workflow company headquartered in Brookline, Massachusetts. SignNow was founded in 2011, acquired by Barracuda Networks in 2013, sold in 2017 to PDFfiller (renamed airSlate in 2019), and today airSlate SignNow is rated 4.2/5 ('Great') on Trustpilot and roughly 4.6/5 on both G2 and Capterra.