[yoavmmn]

I’ve used Nextcloud only for file storage/sync, but they have what you’re looking for: https://nextcloud.com/office/

[nojs]

The sheets app is horrible, it’s not a realistic alternative to Google Sheets.

[HackerThemAll]

Comparing free, hobby project to an office suite developed by many dozens highly paid programmers every day for 17 years. Yes, that makes sense.