The application was pulled from the App Store by Apple last week, due to a claimed breach of rules regarding pornographic material. Prior to its removal last week, 500px had been available in the App Store for more than 16 months.
But on Tuesday, 500px returned to the App Store with a new version that aims to address some of the concerns Apple had with the software. The updated version is rated for users ages 17 and up, and it also adds a "Report this photo" button to help filter out inappropriate content.
Version 2.0.3 of 500px also fixes an issue that would redirect a user after logging in. It also addresses a problem that resulted in partially downloaded photos.
Oleg Gutsol, co-founder of 500px, said to TechCrunch that his team has "worked closely with Apple over the last week to address their requests."
The reappearance of 500px comes as Twitter's new six-second-video sharing application Vine was removed from Apple's "Editors' Choice" section of the App Store. On Monday, a pornographic clip was briefly promoted within the Vine app, which was blamed on "human error." Despite the blunder, Vine remains available in the App Store.