Fellow (ex-)banker turned founder here. I can relate to this... and it is very scary (the amount of spreadsheet craziness I've seen on trading floors is insane). But I still believe that Excel is a powerful and power-enabling tool. And I know from my own experience how fragmented the "Excel tools industry" is.

We've been working on a fully fledged version control system for spreadsheets for ~2 years now and finally getting somewhere with Pathio[0] (we used to be called SpreadGit but that wasn't ideal for many reasons).

It's taken us a while to get here as our aim was always to build a system that: - works with all Excel file formats (including the binary formats) - works with VBA - integrates seamlessly into (non-technical) people's workflow (which is different to how developers work) - is fast (I personally worked on 100mb spreadsheets when I was at UBS...) - gets the diffing right (which is different in two dimensional space where inserting/deleting rows/columns has a knock of effect on potentially a large number of formulas which are just... noise)

Feel free to drop me a note to see if we can be of any help to you - We also have an on-premise version (thanks to the guys at Replicated[1]).

[0]: http://www.pathio.com [1]: https://www.replicated.com