NocoDB

NocoDB is an open source database interface that adds a spreadsheet-like UI on top of any SQL database (PostgreSQL, MySQL, MariaDB, and others), complete with REST API access, webhooks, form views, and all the features you'd find in Airtable. Because it's open source, you can self-host it on your own server and connect it to databases you already own.

Pick NocoDB if you want Airtable's flexibility but need to own your data, self-host, or integrate with an existing database. It's particularly strong for teams who have databases running already and need a quick way to add a spreadsheet-like frontend without rebuilding everything; the open source nature also means you can customize it, contribute improvements, or use it cost-free for small teams.