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Ladybird (web browser)
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Ladybird (web browser)
Ladybird is an open-source web browser licensed under the BSD 2-Clause License. It is developed by the Ladybird Browser Initiative, a nonprofit organization focused solely on development of the browser. The initiative is funded entirely through donations, with Cloudflare, FUTO, Shopify, and 37signals among its sponsors.
Originally created as a component of SerenityOS in 2019, it matured to be developed as a standalone project from 2022 onwards. An alpha release is planned in 2026, beta release is expected in 2027, and a stable release for general public in 2028.
It is a browser engine that is not based on an existing browser engine (e.g. Google's Chromium, Mozilla's Gecko, or Apple's WebKit). Ladybird uses its own rendering engine and JavaScript interpreter with WebAssembly support. The project also uses popular open source libraries (unlike its predecessor in SerenityOS).
An ad blocking feature will be implemented into the finished product.
The project was initially developed by the SerenityOS community using its internal software libraries implementing specific features (with self-descriptive names prefixed with “Lib”, e.g. LibWeb, LibHTTP, LibJS, or LibWasm). Ladybird was spun off into a separate project in September 2022 by Andreas Kling, the founder and a former maintainer of the SerenityOS project.
On June 30, 2024, Kling announced that he would be stepping back from the SerenityOS project to focus solely on building the Ladybird browser. In July 2024 the Ladybird Browser Initiative announced that it was being funded by Chris Wanstrath, the co-founder of GitHub. Ladybird began receiving sponsorships to fund its development including from large companies such as Shopify and Proton VPN.
As of March 2025, it ranked fourth-highest on the Web Platform Tests, a suite of tests used by browser developers, below Chrome, Safari and Firefox. It also had the second most conformant JavaScript engine after Firefox's SpiderMonkey.
In February 2026, Ladybird started porting the JavaScript parser and bytecode generator from C++ to Rust. The developer was assisted by Claude Code and OpenAI Codex artificial intelligence.
Hub AI
Ladybird (web browser) AI simulator
(@Ladybird (web browser)_simulator)
Ladybird (web browser)
Ladybird is an open-source web browser licensed under the BSD 2-Clause License. It is developed by the Ladybird Browser Initiative, a nonprofit organization focused solely on development of the browser. The initiative is funded entirely through donations, with Cloudflare, FUTO, Shopify, and 37signals among its sponsors.
Originally created as a component of SerenityOS in 2019, it matured to be developed as a standalone project from 2022 onwards. An alpha release is planned in 2026, beta release is expected in 2027, and a stable release for general public in 2028.
It is a browser engine that is not based on an existing browser engine (e.g. Google's Chromium, Mozilla's Gecko, or Apple's WebKit). Ladybird uses its own rendering engine and JavaScript interpreter with WebAssembly support. The project also uses popular open source libraries (unlike its predecessor in SerenityOS).
An ad blocking feature will be implemented into the finished product.
The project was initially developed by the SerenityOS community using its internal software libraries implementing specific features (with self-descriptive names prefixed with “Lib”, e.g. LibWeb, LibHTTP, LibJS, or LibWasm). Ladybird was spun off into a separate project in September 2022 by Andreas Kling, the founder and a former maintainer of the SerenityOS project.
On June 30, 2024, Kling announced that he would be stepping back from the SerenityOS project to focus solely on building the Ladybird browser. In July 2024 the Ladybird Browser Initiative announced that it was being funded by Chris Wanstrath, the co-founder of GitHub. Ladybird began receiving sponsorships to fund its development including from large companies such as Shopify and Proton VPN.
As of March 2025, it ranked fourth-highest on the Web Platform Tests, a suite of tests used by browser developers, below Chrome, Safari and Firefox. It also had the second most conformant JavaScript engine after Firefox's SpiderMonkey.
In February 2026, Ladybird started porting the JavaScript parser and bytecode generator from C++ to Rust. The developer was assisted by Claude Code and OpenAI Codex artificial intelligence.
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