PhotoExplorer is a versatile photo browsing and uploading app designed specifically for the iPhone and iPad. It allows users to browse photos in the Flickr universe, as well as upload photos and edit their metadata.

The app is compatible with both iPhone and iPad, making it convenient for users to access their photos on either device. In addition to Flickr, PhotoExplorer also supports browsing and uploading photos to other platforms such as 500px, Picasa, ipernity, Dropbox, Box, OneDrive, and GoogleDrive.

Users can view their own photos, albums, favorites, and contacts' photos. They can also browse Flickr groups photos and view photos in full screen with the ability to swipe through photos and zoom using pinch gestures. The app also offers a slideshow mode, including support for external displays like TV and AppleTV.

One unique feature of PhotoExplorer is the "STACK," which allows users to mark photos and sets from themselves or others. This stack is saved on the device, allowing users to keep a list of photos without having to publish them to Flickr. This is useful for reviewing photos later or sharing them via email.

The app also provides the ability to upload photos directly from the device's photo library, camera, Camera Connection Kit, or computer via iTunes drag and drop. During the upload process, users can specify title, caption, tags, sets, groups, geo location, and privacy settings. Exif and GPS information is maintained when uploading.

PhotoExplorer also offers account flexibility, allowing users to have multiple Flickr accounts active. This is convenient for households sharing an iPad or for individuals with multiple online identities.