Relationship Anniversary is an Android app developed by Martin Luhrman that helps couples track the time they have spent together. The app is free and falls under the Social & Communication category.

The app's main functionality is to display the amount of time couples have been together in years, months, and days. It does not require any complicated setup and is easy to use. Additionally, the app provides a notification every month to remind couples of their anniversary, which is a thoughtful touch.

Overall, Relationship Anniversary is a simple yet effective app that serves its purpose well. It does not have any unnecessary features or complicated interfaces, making it perfect for couples who just want to keep track of their time together.