US app and game distribution and monetisation outfit Tapjoy has completed its latest funding round.

Lead by Rho Ventures, with participation from all existing investors including InterWest Partners, North Bridge Venture Partners and D. E. Shaw Ventures, it raised $21 million.

Along with the financing, Rho Ventures managing partner Mark Leschly joins Tapjoy's board of directors

This brings the total lifetime funding of the company, which was created when Offerpal bought Tapjoy and renamed itself in 2010, to $40 million.

The company's services include the cross-platform viral notification channel Social K-Factor, the cross-app promotion bar AppStrip, and a pay-per-install advertising network.

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The company said the cash would be used to fund growth across emerging ecosystems, and solidify its application distribution and monetisation services on iOS, Android and Facebook. It will also use funds to invest in media licensing and incubation opportunities.

"This is a very exciting time to be an application developer, with opportunities that span across platforms and regions," said Mihir Shah, president and CEO of Tapjoy.

"We look forward to continuing our strong and dedicated working relationships with Apple, Facebook, Google, Yahoo and the other social and mobile platforms we invest in and support."

More than 5,000 app developers and advertisers such as Playdom, Tapulous, GameDuell, Glu Mobile, Barnes & Noble, MTV and Groupon, partner with Tapjoy for monetisation and distribution of their games and apps.