# amberframework/amber

A Crystal web framework that makes building applications fast, simple, and enjoyable. Get started with quick prototyping, less bugs, and blazing fast performance.

Repository: https://github.com/amberframework/amber
Canonical: https://ross.abutalabs.com/products/amberframework-amber
Homepage: https://amberframework.org
Language: Crystal
License: MIT
License Family: permissive
Topics: crystal, web, cohesive, efficient, fast, framework, amber, amber-framework, scaffolding, cli, web-framework
Last push: 2026-08-13T17:04:24+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 63, longevity 100
- inputs: {"age_days": 3425, "days_push": 20, "days_rel": 32, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2604, forks 204 (observed 2026-08-28T04:07:03.991565+00:00)

## What it is
Amber is a full-stack web application framework for the Crystal language, inspired by Rails, Phoenix, and Kemal, providing routing, controllers, ECR views, ORM (Grant), migrations (Micrate), and code generators. It ships with a standalone CLI that scaffolds complete server-rendered web applications with zero-setup SQLite by default.

## Use cases
- build a web application in Crystal
- rails-like framework for crystal
- scaffold a CRUD web app with generators
- server-rendered web app with ORM and migrations
- high-performance full-stack web framework
- quickly prototype a web API or site
- generate a web app without node.js or a database server

## When to choose
- you want a Rails/Phoenix-style batteries-included framework with Crystal's compiled performance
- you need generators, scaffolding, ORM, and migrations wired together out of the box
- you want a zero-setup SQLite-first start with easy PostgreSQL/MySQL options
- you value opinionated conventions and a coherent application structure

## When to avoid
- you need a guaranteed production-stable release — the V2 line is still beta
- you're not working in Crystal or unwilling to learn the language
- you need a minimal micro-framework or full control over component choices
- you require first-class Windows or Intel macOS support, which are not release-gated

## Facets
- artifact type: framework
- maturity: active
- function: web-framework, routing, templating, orm, cli, middleware, websocket
- domain: web-development, backend, developer-tools, cross-platform
- platform: windows, cli, cross-platform
- tags: crystal, rails-inspired, ecr-templates, grant-orm, micrate-migrations, scaffold-generator, server-rendered, opinionated-framework, scaffolding, linux, macos

## Member repositories
- amberframework/amber (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:03.991565+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:21:04.794657+00:00, confidence not recorded.
  - readme: https://github.com/amberframework/amber (fetched 2026-08-28T04:07:03.991565+00:00, sha ee3cbe9455ef)
  - homepage: https://amberframework.org (fetched 2026-08-29T10:04:13.446795+00:00, sha 1a44264ebd1b)
  - site_page: https://amberframework.org/docs/v2 (fetched 2026-08-29T10:04:13.464856+00:00, sha 5acccc9420d4)
  - site_page: https://amberframework.org/docs/v2/getting-started/installation (fetched 2026-08-29T10:04:13.586575+00:00, sha 23cf2cda6318)
  - site_page: https://amberframework.org/docs/v2/guides/web-template (fetched 2026-08-29T10:04:13.624810+00:00, sha 0917d6bf4a77)
  - site_page: https://amberframework.org/docs/v2/guides/native-preview (fetched 2026-08-29T10:04:13.667553+00:00, sha b2ff0a41aca5)
  - site_page: https://amberframework.org/docs/v2/guides/models/grant (fetched 2026-08-29T10:04:13.890217+00:00, sha 60fbf2ebd2ee)
  - site_page: https://amberframework.org/releases (fetched 2026-08-29T10:04:13.497402+00:00, sha b294e3afe082)
  - site_page: https://amberframework.org/amber-way (fetched 2026-08-29T10:04:13.699371+00:00, sha 319fec275973)
  - site_page: https://amberframework.org/characters/amber (fetched 2026-08-29T10:04:14.044537+00:00, sha 5af7e5a411a7)
- Data as of 2026-08-30T08:39:29.467469+00:00.