You could just use a spreadsheet. The reason I pay for cap table management software is that it’s the easiest way to get a 409(a) valuation, which is something

You could just use a spreadsheet. The reason I pay for cap table management software is that it’s the easiest way to get a 409(a) valuation, which is something pretty much every US startup needs annually and open source couldn’t replace. (I looked at getting a 409(a) valuation separately and the best prices were more than cap table software that bundled one.)