Proton Launches Proton Sheets

Oh wow! Looks lovely TBH Congratulatiosn to the proton team!

EDIT: Anyone in the proton team can make public any details?What do you use for collaboration? How compatible is with Excel?

Disclaimer: I am the creator of another spreadsheet engine

I want this as OSS so I can selfhost it - it looks fantastic, I probably give it a spin to get rid of google sheets.

I wish Proton instead focused on its core products, Mail and Calendar instead of introducing more office products.