An app that pings drivers approaching D.C. speed cameras has gotten the green light from Apple, a week after its rejection by the tech giant was first reported.

Northern Virginia developer Charles Yeh said the company e-mailed him out of the blue Tuesday morning to say his app, Speed Cameras Alert, had been reviewed and approved. By afternoon, it was available in the app store, ready to be downloaded — for free.

From Apple:

Dear Charles Yeh,
The following app has been approved and the app status has changed to Ready for Sale:
App Name: Speed Cameras Alert

Apple had initially rejected the app on grounds it was not legal in all of the locations where it would be  available and could be used to help users break the law. A subsequent appeal to the company, Yeh says, also was rejected. D.C. Police said the database from which the app draws its data is public information, and thus the app’s contents were completely legal.

After the app was rejected, Yeh started an online petition that amassed dozens of signatures over the course of a week. And tech bloggers criticized Apple’s initial decision, saying it represented an unnecessary overreach, especially given apps such as Google’s navigation app Waze — available in the app store — which allows users to plot the locations of speed cameras to warn other drivers. Yeh said he felt bullied by the tech giant.

Tuesday’s e-mail saying the app had been approved came as a surprise, said Yeh, who had begun developing  an Android version of the app after Apple’s rejection.

“I was pretty happy to get the news,” he said of Apple’s reversal. “It was pretty spontaneous.”

As for how many had downloaded it after a much-anticipated launch? He laughed.

“It’s still early.”