Grist

Grist bridges the gap between spreadsheets and databases without forcing you into one or the other. It uses real SQL tables for storage while keeping the familiar grid interface that spreadsheet users expect, letting you work with data in a way that feels natural.

Self-hosting is available for teams that need full control, and a cloud option serves those preferring managed infrastructure. It's open-source, so you can inspect and modify the codebase to fit your needs.