Planpop, developed by Moments Technologies Inc., is a free Android app that aims to make planning social and customizable. The app allows users to create plans with various details such as date/time, location, pictures/videos, alerts, and URLs.

Users can also explore what their friends are up to on the Home Tab and add plans to their calendar or join their friends' plans with just one tap. Additionally, users can share their plans directly with friends through the app or keep them private. The app also features a Chat function that allows users to coordinate with friends, make groups, and share plans directly in the chat.

Overall, Planpop is a solid app for those looking for a social and customizable planning experience. The app's various features make it easy to plan events and coordinate with friends. However, it should be noted that the app does prompt users to send feedback to the developer's email or chat with the team within the app, which could be seen as intrusive to some users.