Cozi has raised an additional $2.5 million, money that the Seattle startup plans to use to expand internationally and further develop its premium offering.

Founded in 2005 by entrepreneurs Robbie Cape and Jan Miksovsky, Cozi is an online calendar and organizational tool that’s designed to help families keep track of daily schedules, grocery lists and other household chores.

Cape, who prior to Cozi worked at Microsoft, said that the company is seeing “enormous demand” for the product from mobile operators overseas. It already operates mobile apps for the iPhone, Android and BlackBerry.

Cozi is not alone in the mobile calendaring space.

Last month, we wrote about a new mobile calendar service called Skedi that is also designed to help families stay up-to-date on activities and schedules.

But Cozi has been around longer than most, now boasting some three million registered family members in its system. The company also has been well funded, raising some $21 million from the likes of newspaper giant Gannett Co. and others.

The latest round was provided by existing investors, and according to a SEC filing included $2.4 million of a $7.1 million round. Board members at the company include Visio co-founder Jeremy Jaech; Gannett vice president Dan Ehrman; and former Intuit executive Mark Goines.

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