Never mind that the U.S. real estate market is in crisis. Web site Trulia.com plans to take advantage of the slump with a free mobile application for the iPhone and other devices.

The software lets house seekers find listings or open house events on the fly, and works with GPS technology to pinpoint users’ locations and select appropriate properties. If one looks promising, a home seeker can call the broker with just one click.

Trulia, which has operated an advertising-backed real estate website for three years, has also designed applications for the BlackBerry and for phones from Samsung, Nokia and Sony Ericsson and for Dash Navigation, a maker of GPS devices for the dashboard.

“While the real estate market is going through challenging times it’s phenomenal for us,” said Trulia CEO Pete Flint, who added that buyers are more cautious and as a result spend more time doing research using services such as Trulia.  “Consumers need information more than ever.”

Flint said Trulia started work on a mobile app when it found consumers increasingly using their phones to look up its website, which is better suited for desktop computer viewing, particularly on Sunday afternoon.