Marlinspike launched Open Whisper Systems' website in January 2013. Marlinspike later left Twitter and founded Open Whisper Systems as a collaborative open source project for the continued development of TextSecure and RedPhone.

RedPhone was also released under the same license in July 2012.

Twitter released TextSecure as free and open-source software under the GPLv3 license in December 2011. Some criticized the removal, arguing that the software was 'specifically targeted people under repressive regimes' and that it left people like the Egyptians in 'a dangerous position' during the events of the 2011 Egyptian revolution. Shortly after the acquisition, Whisper Systems' RedPhone service was made unavailable. Marlinspike could help the then-startup improve its security'. The acquisition was done 'primarily so that Mr.

The financial terms of the deal were not disclosed by either company. In November 2011, Whisper Systems announced that it had been acquired by Twitter. They also developed a firewall and tools for encrypting other forms of data. Among these were an encrypted texting program called TextSecure and an encrypted voice calling app called RedPhone. The company produced proprietary enterprise mobile security software. Security researcher Moxie Marlinspike and roboticist Stuart Anderson co-founded a startup company called Whisper Systems in 2010.

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