Dooble is a free and open source web browser. Dooble was created to improve privacy. Currently, Dooble is available for FreeBSD, Linux, OS X, and Windows. Dooble uses Qt for its user interface and abstraction from the operating system and processor architecture. Because of this, Dooble should be portable to any system that supports POSIX threads and the Qt WebKit library, and triversally Qt, OpenSSL, SQLite and other common libraries.[citation needed] Dooble provides integration with Spot-On, a privacy focused communication suite written by the author of Dooble.