Stacker

Stacker connects to an existing data source and generates an app around it, tables, records, forms, dashboards, with a permissions model built for real business processes: different roles seeing different fields, approval steps, and record ownership rules that go beyond a simple logged-in-or-not toggle. That makes it a common pick for a client portal tied to a CRM or an internal system layered on top of an operational spreadsheet.

Pricing is per user, tiered by the number of internal and external users and how much workflow automation a plan includes. Because the data stays in the connected source, Salesforce, Airtable, Smartsheet, migrating away from Stacker mostly involves rebuilding the interface rather than moving records, similar to Softr’s lock-in profile. The ceiling is visual design flexibility, Stacker prioritizes functional permissions and workflow over a highly customized look, so a brand-forward client portal may find the templates limiting. It fits ops-heavy teams that need a permissioned portal tied closely to an existing business process, not just a simple client-facing directory.