Browse and view photos or videos from 500px 

Instagram features 

- Browse popular photos 

- Search photos by tag 

- Search users by name 

- Browse your photos, followed users, and liked media 

- Like/unlike a photo 

- View comments of a photo 

- Slideshow photos 

++ External display slide show (Pro version only) 

++ Random order slideshow (Pro version only) 

- Show a photo geo-location if available 

- Share a photo via email, Facebook, Twitter or Sina-Weibo (iOS 6.x or greater) 

- Save a photo to camera roll 

+ Save a video to cameral roll (Pro Version only) 

+ No ad banners (Pro Version only) 

- An Instagram account is needed to avoid Instagram query limit. 

500px Features 

- View rating-based streams (Popular, Upcoming and Editors' choices) 

- View time-based streams (Today, Yesterday, and Week) 

- Search photos by terms and tags 

- View the blogs from 500px.com 

- Create a new blog and edit an existing one (Pro Version only) 

- Follow/unfollow a photo owner 

- Search users 

- View a user's friend list 

- View a user's blogs 

- Fullscreen photo feature 

*** slideshow photos 

---- pacing control 

---- sequential or random control 

---- show/hide photo caption & photo owner name control 

---- external display slideshow (Pro Version only) 

*** view a photo's comment and make a comment 

*** Share a photo by Facebook, Twitter(iOS5.0 or higher), and email 

*** Add/remove a photo from favorites 

*** Vote(Like) a photo 

*** View a photo's location if available 

*** View a photo owner's photo stream, friends's photos and favorites 

- User-based features 

*** View friend list and friends' photos 

*** View your follower list 

*** View your photo streams 

*** Upload photos 

*** View your favorite photos 

*** View your friends' photos 

*** View Collections (Portfolio & Profile Sets) 

+ No ad banners (Pro Version only) 

------ 

The app is not developed by either Instagram or 500px