Lowdefy

Lowdefy takes a config-first approach to building internal tools: you define your entire application in YAML or JSON files rather than dragging components around. It generates web apps from that configuration, connecting to PostgreSQL, MongoDB, Stripe, Sendgrid, and other services via built-in connectors. This approach makes it easy to version control your tools, reuse templates across projects, and version-manage changes the way you would code.

It works well for teams that already use Git workflows and prefer declarative configuration over visual builders. Unlike visual no-code platforms, Lowdefy forces you to be explicit about your app structure, which appeals to developers who value transparency and reproducibility. Self-hosting is straightforward; the framework compiles to a standard Node.js application.