Independent · Built in .NET · Open

A browser,
managed.

Starling is a web browser engine with no Chromium, no Gecko, no WebKit underneath — a managed-first engine, written from the ground up in .NET. Parser, layout, paint, and a JavaScript runtime, all its own.

parser · cascade · layout · paint .NET · multi-process
the engine, rendering

Real sites. No borrowed engine.

This is Starling drawing a live site — parser, cascade, layout, and paint pipeline, end to end. Every box and glyph on screen is computed by code written for Starling, running on .NET.

starling://render — netclaw.dev
live paint
render preview · add assets/render.png
project status

Honest numbers, backed by tests.

Starling is experimental. Each figure is measured by a real test suite — Test262, Web Platform Tests, and Starling's own specs. Nothing rounded up.

ECMAScript / Test262language suite
0%
Core language conformance across the Test262 suite.
Web Platform Testsclimbing
0%
Cross-browser behaviour across DOM, CSS, and HTML.
HTML parserspec
spec-compliant
Paint backendshipped
stable
DOMpartial
in progress
CSS & Layoutpartial
in progress
Networkingpartial
in progress
GUI shellpartial
in progress
why build it this way

A managed-first browser is a bet — that the engine no longer needs C++.

Ladybird proved an independent engine is viable. Arc and Dia ship in Swift. Starling pushes the idea further: a browser engine written in a managed language, in the open, beholden to no vendor.

01

No borrowed engine

HTML parsing, the DOM, the CSS cascade, layout, paint, and a JavaScript runtime — all written for Starling. Nothing forked from Blink or WebKit.

02

Managed by design

Built on .NET, multi-process by architecture. The bet is that memory safety and tooling can come from the platform, not from years of hardening.

03

WASM as a first-class citizen

The long game: earn parity on real sites, then let WebAssembly reach the DOM directly — not as a guest behind a JavaScript bridge.

see for yourself

Read the code. Run the engine. Watch it earn the web.

Experimental software · built in the open · not yet hardened for daily use