Surprised nobody has mentioned this. There is a company called Boardwalktech with a tool called "Excel Cloud" which adds a native extension into Excel which inc

Surprised nobody has mentioned this. There is a company called Boardwalktech with a tool called "Excel Cloud" which adds a native extension into Excel which includes a change log and (i think) realtime collaboration, among other things. They call their underlying tool a "digital ledger" which sounds very blockchain-y, but it's not a distributed public ledger so there's no crypto here, just a centralized, Boardwalktech controlled ledger. https://www.boardwalktech.com/products/boardwalk-excel-cloud https://www.boardwalktech.com/products/boardwalk-excel-cloud They're already integrated with some very big companies like Accenture, Ernst and Young, Coca-Cola, Mars, Facebook, etc etc. Personally, I can't imagine company leaders really investing tens to hundreds of thousands of dollars leaving their processes in Excel and not instead buying a real system, but I'm not running all of the companies mentioned above.