kemalcr/kemal

Health v2 · maintenance only

Adoption not part of the score

3907 stars · 203 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Kemal is a fast, lightweight web framework for the Crystal language with a Sinatra-like DSL for building web applications and JSON APIs. It offers built-in routing, WebSocket support, middleware, static file serving, and templating with near-native performance.

Use cases

• build a fast json rest api
• create a web application in crystal
• build a real-time app with websockets
• serve static files with high performance
• build a microservice with minimal boilerplate
• create a live dashboard or chat app

When to choose

• you want Ruby-like syntax with compiled, C-level performance
• you need a simple, unopinionated framework without a forced ORM
• you're building JSON APIs or real-time WebSocket services in Crystal
• fast startup and low memory footprint matter

When to avoid

• your team doesn't know Crystal and can't adopt a niche language
• you need a batteries-included full-stack framework with built-in ORM and admin tooling
• you need a large ecosystem of third-party libraries and hiring pool

Facets

framework · maturity stable

web-framework http-server routing middleware websocket templating json static-site-generator web-development backend apis rest-api microservices high-performance dsl sinatra-inspired real-time crystal linux macos web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="kemalcr/kemal")