Automated Software Testing at Scale

Cloud9 aims to reduce the resource-intensive and labor-intensive nature of high-quality software testing.

Cloud9 parallelizes symbolic execution - an effective but still poorly scalable test automation technique - to large shared-nothing clusters. To our knowledge, Cloud9 is the first symbolic execution engine that scales to large clusters of machines, thus enabling thorough automated testing of real software in conveniently short amounts of time. Preliminary results indicate one to two orders of magnitude speedup over a state-of-the-art symbolic execution engine.

Cloud9 is an on-demand software testing service: it runs on compute clouds, like Amazon EC2, and scales its use of resources over a wide dynamic range, proportionally with the testing task at hand.

Cloud9 can be downloaded from



Cloud9 received the Gold Prize at the OSS World Challenge 2013.