Optimizely, today celebrates passing a milestone of seven billion web experiences optimized. Fueled by rapid product expansion and high demand, the company has achieved triple digit year-over-year growth in annual revenue since launching in 2010. The company also announces closing a $57 million Series B round of financing led by Andreessen Horowitz, with participation from Benchmark Capital and Bain Capital Ventures. The round brings the company's total funding to $88 million.

Optimizely provides an optimization platform that enables any organization to run experiments online to help them deliver better experiences to their customers. Today, the company serves over 7,000 customers, making it the most widely adopted optimization platform in the world. The new funding will accelerate Optimizely for iOS, Optiverse, and the Optimizely Developer Platform; new offerings rolled out last month at the company's first customer conference, OptiCon.

'Optimizely is the clear leader in the new-and incredibly crucial-software category of website and mobile optimization,' said Scott Weiss, general partner at Andreessen Horowitz. 'Testing and personalization powered by Optimizely gives businesses the ability to use data-driven decisions to provide users with a better experience. Optimizely represents the future of highly efficient product and business development, enabling users without technical expertise to run tests and achieve immediate results.' Weiss joins Optimizely's board of directors.

Currently, Optimizely customers:

Have created more than a half million experiments
Create approximately 1,000 new experiments on Optimizely every day
Are running nearly 30,000 experiments on Optimizely
Run an average of four experiments on their website at any given time
Achieve average gains between 13 and 29 percent across several metrics, including revenue, through optimization
Comprise more than 5 percent of the top 10,000 Alexa-ranked websites in the world, greater than any other optimization platform
Are located in 101 countries

'Our vision is to enable the world to turn data into action. We think website and mobile optimization are just the first steps on that journey.' said Dan Siroker, co-founder and CEO of Optimizely. 'Today, with the investment led by Andreessen Horowitz, we plan to double-down on our product and ecosystem to make our customers and partners even more successful.'

About Andreessen Horowitz
Andreessen Horowitz backs bold entrepreneurs who move fast, think big and are committed to building the next major franchises in technology. Founded by Marc Andreessen and Ben Horowitz, we provide entrepreneurs with access to our deep expertise and insights in innovation, business development, market intelligence, executive and technical talent, and marketing and brand building. Find us in Menlo Park, Calif., and at www.a16z.com.

About Optimizely
Optimizely is the world's leading optimization platform, providing A/B testing, multivariate testing, and personalization for websites and iOS applications. The platform's ease of use empowers organizations to conceive of and run experiments that help them make better data-driven decisions. Optimizely meets the diverse needs of any organization looking to deliver unique experiences to their audience. To learn more, visit optimizely.com or join Optiverse today.