Simple Moon Phase Calendar is an Android-based application that allows users to monitor the current phase of the moon. This app is developed by fxwill and falls under the category of lifestyle with a subcategory of weather. This app is an improved version of the previously launched "Simple Moon Phase Widget" and comes with a host of new features.

The app has a lightweight design and is easy to use. The calendar displays variations of the background, additional data, moon sign, and Mercury retrograde. Tapping on the date on the calendar will display a large moon image on the detail screen, along with detailed data such as the age of the moon, the distance to the moon, percent illumination, and the time of moonrise and moonset. The app also notifies the user of full moon and new moon, first quarter, and last quarter in the status bar. The widget is resizable, and the app also includes a memo function on the calendar.

Users can choose to purchase the paid feature to change the color of the moon. However, the app does not change the wallpaper, and users must prepare the wallpaper themselves. Additionally, the app does not provide images that completely reproduce the libration of the moon. Overall, Simple Moon Phase Calendar is an excellent app for those interested in tracking the moon's phases and is worth trying out.