Open app marketplace Appia has reported record growth in Q2 2011, and the passing of several major milestones. During the second quarter, the Appia-powered app marketplace crossed the 1m downloads per day threshold, and reached over 40m downloads in July. In the 38 months since launching, the Appia marketplace has delivered 200m cumulative downloads, with over 100m downloads generated in the last four months alone.

“With the rate of downloads on Appia’s open app marketplace now standing at more than 40m per month, Appia has quickly emerged as one of the industry’s largest app stores,” says CEO, Jud Bowman. “Our ability to drive revenue and significant downloads for our community of 32,000 developer partners is unparalleled in the industry.”

The Appia Marketplace boasts 140,000 applications from more than 32,000 developers across every major operating system, including Android, iOS, BlackBerry, Java, Windows and Symbian, with thousands of Android apps being added every month. During July, Appia saw downloads from over 200 countries and 3,500 different handsets.

Appia says it is also enjoying success with its pay-per-download (PPD) marketplace, which allows developers and publishers to pay as little as $0.10 per download to promote their apps within Appia-powered stores, with targeting available by platform and country. Since the launch of the PPD platform in April, Appia has run sponsored app campaigns for more than 30 developers, including Priceline, Flirtomatic, textPlus and Amazon, resulting in over 2.5m sponsored app downloads in less than three months.

Developers can find out more and join the Appia Marketplace here.