Founded in 2003 by Alex Hoyau, Pol Goasdoué and Pierre Teissière. The project is oriented towards video and cross media.
In 2005, the version v0-6 is presented at the WWDC2005 in Cupertino California. Apple is interested in Flash capacity to compete with their QuickTime plug-in. Macromedia has just been acquired by Adobe, Apple’s main partner.
In 2006, the program was presented in several conferences at La Villette and won a challenge organized by Dauphine high school with INRIA - French National institute for research in computer science and control. The program at this time was mainly used for freelancers small projects.
In 2007, Silex source code officially released as open source
In 2008, Silex was among the 100 first Open Source projects on SourceForge. Silex v1 is released.
In 2009, Silex was project of the month on SourceForge. The program was presented Silex at several French conference: Futur en Seine, Les Trophées du Libre, Pas sage en Seine, Wikiplaza 
In 2010, the team members formalized their cooperation by creating a non profit organization for promotion, deployment support, and development of open source software projects related to Silex and Open Source Flash. The organization became the official maintainer of AMFPHP, a mature communautary project.
In 2012, Silex has reached the 100.000 downloads. And the team has made a dedicated version for HTML, the html5 editor, which was downloaded 1000 times on the first month.
In 2016, Silex Labs foundation has set up a crowd funding campaign to give Silex international concern by creating a multilingual documentation and tutorials, and to create free templates to facilitate the creation of a website, and to develop a "responsive editor" to make it possible to optimize the mobile version of websites.