Definely Proof is automating hundreds of proofreading checks to catch undetected errors before they become a problem. Proof is built to handle the unique formatting idiosyncrasies of legal documents including:

• Detecting definitions issues including fixing inconsistent punctuation, quotes, styles and fonts, sorting defined terms into the correct order and flagging terms used in a document before they have been defined
• Catching cross-reference issues
• Ensuring consistent capitalization including finding defined terms that aren't captiatlized and pinpointing any incorrect or inconsistent capitalisation
• Identifying any comments, placeholders or markups that should be removed
• Fixing formatting errors including incorrect, missing or inconsistent double spacing an ensuring alignment between numbers and their corresponding description in the document

Proof is helping lawyers ensure legal documents are free of errors, avoiding costly errors and slowing down the contracting process. Find and fix issues with a click of your mouse.

Funding Information:

Definely has total funding of $40 million.

In June 2025, Definely announced a $30 million Series B round involving investors from both Europe and North America. The round was led by growth investor Revaia and included Alumni Ventures, Beacon Capital, and Canadian legal tech company Clio. Returning investors Octopus Ventures, Zrosk Investment Management, The Raine Group, and Cornerstone VC also participated in the round.

In May 2025 it had a $7m Series A investment round led by Octopus Ventures, with participation from Cornerstone VC and Zrosk Investment Ltd. It also saw participation from well-known angels Claire Hughes Johnson, Comron Sattari, Ajay Patel, and Babatunde Soyoye join the cap table.

In September 2021 Definely announced a £2.2m funding round, led by both Microsoft's venture capital fund M12 and CRE Venture Capital.

In September 2020 It announced £1m in Seed funding.  Investors included Dan Cobley, Nick Jenkins and Zrosk Investment Management.