Interval is a good choice if your team is using Node.js or Python. It generates UI elements automatically from your backend code so you can concentrate on business logic. It's got features like multi-factor authentication and custom roles to span the chasm between techies and nontechies, and it's got a free Starter tier and a Teams tier that costs $10 per user per month.
Another option is Noloco, a no-code app builder that dovetails with tools like Airtable and Google Sheets. It's got a range of customizable components and strong permission controls. That makes it a good choice for building client portals, internal tools, CRMs and team intranets even if team members don't know how to code. Noloco has a free trial, so it's accessible to teams of any size.
Replit is another strong contender, especially for teams that need a full-featured environment for building and deploying websites, automations and internal tools. It's got AI code generation, collaboration tools and strong security controls. It's got a free Starter tier and paid plans that scale up, so it's good for small teams and large enterprises.
Last is Softr, a no-code service for building custom client portals, internal tools and community hubs based on data in Airtable and Google Sheets. Its drag-and-drop interface, fine-grained permission controls and integration with tools like Zapier make it a good choice for teams of different sizes. Softr has a range of pricing tiers, including a free plan, so it can handle different needs.