Softr

Softr is a platform for building client portals, membership sites, and internal tools powered by data from Airtable or Google Sheets. It offers pre-built blocks, user authentication, payments, and dynamic content. It's ideal for freelancers, agencies, and startups needing to create data-driven applications quickly. It has a free plan and paid plans from $49/month.

Its strength lies in turning spreadsheets into secure, beautiful web apps without code, offering a perfect bridge between flexible databases and user-friendly front-end interfaces.