#77th of 20 in App builder starters
lowdefy
YAML-config framework for building internal web apps and admin tools
- Stars
- 3k
- License
- Apache-2.0
- Last commit
- Nov 2026
- Last release
- Nov 2026
- Language
- JavaScript
2,940 on 21 Apr 20263,022 on 10 Nov 2026
From GitHub's daily star counts.
Checked on GitHub.
Overview
Lowdefy builds web apps from YAML config instead of hand-written React. Pages are composed from 70+ UI blocks and 50+ logic operators, with connectors for MongoDB, PostgreSQL, MySQL, REST, Google Sheets, S3, Elasticsearch and Stripe. The runtime is built on Hono, Vite and Auth.js and extends through npm plugins. The README pitches the config as a reviewable target for AI-generated apps.
Who it is for: Teams building internal tools and CRUD apps, with or without AI-generated config
Ranked among open-source alternatives to Lovable (#9 of 10), v0 (#8 of 10), Bolt.new (#7 of 10) and Replit (#7 of 10).
Strengths
- Schema-validated config is interpreted, not executed, so there are no arbitrary code paths
- Ships 70+ UI blocks and 10+ data connectors including MongoDB, PostgreSQL and Stripe
- Auth.js integration with 75+ auth providers, role-based access control and private pages
- Plugin system for blocks, connections, operators, actions and auth providers via npm
Weaknesses
- No built-in LLM features; the AI role is only generating config for you
- Logic lives in YAML operators, which gets awkward for complex behavior
- Custom UI beyond the provided blocks requires writing npm plugins
- README promotes the maintainer's paid app-building service alongside the project
What it needs
- JavaScript
- Needs Node.js
Quick answers
Is lowdefy open source?
Yes. Its code is on GitHub under the Apache-2.0 license.
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