Newalgebra.com [better]

The design is very bare-bones. It looks like a utility tool from the early 2000s. While this loads fast, it can be intimidating for non-technical users. There is little hand-holding; if you don't know what "Liquidation Preference" or "Option Pool" means, the tool won't teach you the definition—it just asks for the number.

NewAlgebra.com is not a standard calculator or a basic finance blog. It is a specialized digital tool designed to solve a very specific and painful problem: handling the math of equity splits, vesting, and "rich-to-poor" dilution scenarios. If you are a startup founder dividing up pie slices, or an investor trying to model complex cap tables without building an Excel nightmare, this tool is a hidden gem. newalgebra.com