Cluster is an Android app developed by Cluster Apps that allows you to create private spaces to share photos and memories with the people who matter most to you. You can create these spaces with family, friends, coworkers, or anyone else you choose. The app is perfect for college students who want to share memories with friends that may not be appropriate for other social networks, new moms who want to share photos of their baby with close friends and family without spamming everyone on other social networks, or families who want to keep in touch even if they're not in the same place.

Cluster is a private and secure app where only invited members of the space can see what you post. The app is available on Android and the web, and it provides relevant notifications to let you know when people you invited post new things to the space. The app has been featured by the New York Times, TechCrunch, and many more, and it was recently featured on Google Play under "Play Picks" and "Best Apps of 2013."

The app requests certain permissions, including network access for communicating with servers, location access for posting your location, contact access for inviting people to your album, and external storage access for downloading photos from other members of your album. However, the app ensures that your contacts will not be uploaded to their servers.