On March 18, 2010, Fluid developer Todd Ditchendorf announced on his weblog that he was open-sourcing the browser-portion of Fluid (also used by the Cruz browser) under the Apache License as Fluidium.
On June 7, 2010, Todd Ditchendorf also open-sourced the "SSB creator" portion of Fluid, also known as Fluid.app.
On May 1, 2011, Fluid 1.0 was released with a completely new codebase. Fluid Apps created with previous versions of Fluid cannot be updated via software update and SSBs have to be re-created with Fluid 1.0 (to transition to version 1.0 and later). While version 1.0 is still a free app, a Fluid License can be purchased which will unlock extra features (some previously included by default in previous versions). On July 4, 2011, version 1.2 was released and featured compatibility with Mac OS X 10.7 Lion.