Internal tools & data apps · Resonancy.io
Lowdefy
Open-source, config-first (YAML) framework for building internal apps, designed to be reviewable when AI-generated.
Lowdefy is an open-source, config-first web framework: instead of a purely visual drag-and-drop builder, apps are defined declaratively in YAML, which the project positions as easier for both humans and AI assistants to generate, review and maintain than generated source code. It ships 70+ prebuilt UI components (tables, forms, charts, markdown), 50+ operators for data handling, built-in authentication and role-based access, and deploys anywhere Node.js runs, including Vercel. It is Apache-2.0 licensed and remains under active development after four-plus years as an open-source project, with production use reported at companies including Avis and Lexus. Like other internal tool builders, it earns a place here as a UI layer for a database or API rather than as an analytics product; there is no separate managed/paid tier advertised.
At a glance
| Vendor | Resonancy.io |
|---|---|
| Pricing model | Open source + paid options |
| Free tier | Yes |
| Deployment | Cloud, Self-hosted |
| Open source | Yes (Apache-2.0) |
| Best for | Teams wanting a free, config-first internal app framework that's easy to review when AI-generated. |
Pricing
Free, open-source framework you self-host or deploy yourself (e.g. to Vercel); no vendor-hosted paid tier is advertised.
Pricing has not been verified yet — see the vendor's site.
Features
- Declarative, config-first (YAML) app definitions
- 70+ prebuilt UI components
- 50+ operators for data transformation and logic
- Built-in authentication and role-based access (Auth.js)
- Deployable anywhere Node.js runs
- Designed for AI-assisted generation and human review
Integrations
Profile last reviewed September 21, 2026