# openkraken/kraken

A web standards-compliant, high-performance rendering engine based on Flutter.

Repository: https://github.com/openkraken/kraken
Canonical: https://ross.abutalabs.com/products/openkraken-kraken
Homepage: https://openkraken.com
Language: TypeScript
License: Apache-2.0
License Family: permissive
Topics: kraken, flutter, web, engine
Last push: 2022-12-30T15:02:55+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2098, "days_push": 1342, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4927, forks 305 (observed 2026-08-28T04:09:02.564759+00:00)

## What it is
Kraken is a high-performance rendering engine built on Flutter that supports web standards (HTML/CSS/JavaScript), letting web-style code run natively on mobile and desktop. It integrates as a Flutter widget and is driven by JavaScript bundles.

## Use cases
- render web-like UIs natively inside a Flutter app
- build cross-platform apps with HTML/CSS/JS without a WebView
- achieve native-like scrolling and animation performance for hybrid pages
- run dynamic JS-driven UI bundles on iOS and Android
- reuse existing web frontend skills for mobile development

## When to choose
- you want web-standard HTML/CSS/JS rendering embedded in Flutter with native performance
- you need dynamic, remotely-updatable UI bundles in a mobile or desktop app
- your team knows web frontend but targets native mobile platforms

## When to avoid
- your project uses Flutter 3.x or later - use the maintained fork WebF instead
- you need a fully standard browser environment or broad web compatibility
- you need a project with active recent releases and ongoing support

## Facets
- artifact type: framework
- maturity: maintenance
- function: web-framework, frontend-framework, graphics, mobile-framework, desktop-framework
- domain: web-development, frontend, mobile-development, cross-platform
- platform: windows
- tags: flutter, rendering-engine, web-standards, html, css, javascript, cross-platform, hybrid-app, ios, android, macos, linux, web

## Member repositories
- openkraken/kraken (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:02.564759+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 2026-08-29T18:17:59.370759+00:00, confidence not recorded.
  - readme: https://github.com/openkraken/kraken (fetched 2026-08-28T04:09:02.564759+00:00, sha f40eaa702c61)
  - homepage: https://openkraken.com (fetched 2026-08-29T09:00:08.741813+00:00, sha 44136fa355b3)
- Data as of 2026-08-30T08:39:29.467469+00:00.