iExplorer for 500px

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 
- 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