We got frustrated with lack of tools available to founders to model their SAFE rounds and subsiquent dilutions, so we built an open source library and cap table worksheet.

The underlying finance library is MIT licensed and we've done our best to match it up with known sources of truth (Excel spreadsheets from lawyers), along with tests!

Feel free to give feedback to either me (mdp@1984.vc), or team@1984.vc

This looks great. Is there a way to add SAFEs after a priced round as well? I know that scenario becomes a bit more common with the difficulty of raising Series A's i.e. the need for seed extension rounds which often are more straightforward with SAFEs