Soundtrap is a new browser based digital audio workstation that officially come out of beta today (June 29th, 2015). Soundtrap also allows online collaboration, competing with platforms like Blend and Splice.
The service works on many different platforms, including Mac, Windows, Linux, iOS, and Android. Users can record using their mic, plug in their own instruments, or use provided software instruments.
Soundtrap says they have 120,000 users from their beta launch.