Some of the tech is open source ( https://github.com/EqualTo-Software/stackedit-sheet-markup ) and some of it depends on tech in our closed-source EqualTo Sheets product ( https://sheets.equalto.com/ ), which is in beta right now. We've considered open-sourcing some / all of EqualTo Sheets, and it may yet happen, but it's not something I could commit to right now.
Some of the tech is open source ( https://github.com/EqualTo-Software/stackedit-sheet-markup ) and some of it depends on tech in our closed-source EqualTo Sheets product ( https://sheets.equalto.com/ ), which is in beta right now. We've considered open-sourcing some / all of EqualTo Sheets, and it may yet happen, but it's not something I could commit to right now.