You've got a craving for pho. Where is that pho food truck you like parked? A new app, being launched in Portland, Maine, and Denver, will tell you.

Cole Herbst places hand wraps on a table for Geoff Briggs at the Mr. Tuna mobile sushi bar on the Eastern Prom in Portland on Thursday.

A customer picks up food at the Mr. Tuna mobile sushi bar on the Eastern Prom in Portland in mid-July.

Norma Knowlton gets her change back after ordering food from Hoss & Mary's Tasty Grub at Congdon's After Dark food truck park on Sunday The Knowlton's have a cottage up the road and came to the food truck park last year, but Sunday was their first time this year.

Customers patronize Congdon's After Dark food truck park on Sunday.

Kaitlyn Webb works the register at her mother's food truck Knew Potato Caboose at Congdon's After Dark food truck park on Sunday. The truck sells food at Congdon's seven days a week.

People stand in line to order or wait for their food at Congdon's After Dark food truck park on Sunday.

People stand in line to order or wait for their food at Congdon's After Dark food truck park on Sunday.

Emma Ouellette works the beverage truck at Congdon's After Dark food truck park in late July. This summer is Ouellette’s fourth summer working at Congdon’s. “It has still been busy,” she said. “I think people just feel safer being outside.”

People stand in line to order or wait for their food at a safe distance apart form each other at Congdon's After Dark food truck park on Sunday. A signs telling customers a face mask is required and asking them to social distance are placed through the park.

People stand in line to order or wait for their food at a safe distance from one another at Congdon's After Dark food truck park in late July. Signs reminding customers a face mask is required and asking them to social distance are placed through the park.

Emma Ouellette works the beverage truck at Congdon's After Dark food truck park in late July. This summer is Ouellette's fourth summer working at Congdon's. "It has still been busy," she said. "I think people just feel safer outside."

Craig Vermette and Addison Berry of Portland eat at a picnic table at Congdon's After Dark food truck park on Sunday.

From left Ashton Knowlton, Dave Knowlton and Norma Knowlton wait for their food in front of Hoss & Mary's Tasty Grub at Congdon's After Dark food truck park on Sunday.

People stand in line to order or wait for their food at a safe distance apart form each other at Congdon's After Dark food truck park on Sunday. A signs telling customers a face mask is required and asking them to social distance are placed through the park.