Ladybird is an open-source web browser developed by the Ladybird Browser Initiative, a nonprofit organization focused on development of the browser.[1] It is licensed under the BSD 2-Clause License.[2] An alpha release is planned in 2026,[3][4] beta release is expected in 2027, and a stable release for general public in 2028.[5] Originally a component of SerenityOS, it is now being developed as a standalone project.[6] The initiative is funded entirely through donations, with Cloudflare, FUTO, Shopify, and 37signals among its sponsors.

Ladybird uses a new browser engine called LibWeb that is being created from scratch by the development team. Unlike SerenityOS, it will also use other open source libraries for development.[2] An ad blocking feature is planned.[7] Unlike most new web browsers, Ladybird does not rely on Chromium or Firefox and uses its own rendering engine and JavaScript engine.[8]