Stacker

Stacker turns Airtable or Google Sheets bases into secure, branded client portals and internal web apps without code. It adds user logins, permissions, and a polished UI on top of your spreadsheet data. It's designed for agencies, startups, and businesses to share data with clients or teams. Pricing starts at $99/month.

It scores for its specific use case of creating professional front-ends for spreadsheet data, enabling businesses to move from shared sheets to proper, permissioned web applications.