Lucid is an Android app that provides a customizable and functional clock display for your device. The app is available for free, but the modules will stop after 30 minutes of continuous usage. To continue using the app, you can purchase the full version for only 0.99 EUR / 1.49 USD through an in-app purchase.

The app is very customizable and comes with a lot of functionality. It automatically starts when you put your device in the dock or when you charge it. The clock display can show the current time and date, battery level, weather, unread GMails, new SMS texts, missed calls, next alarm, and many more information from most DashClock extensions. Additionally, the app has an RSS view that flips through new events from your RSS feeds and a slideshow view that starts a slideshow with images from your device.

To use and configure the app on Android 4.2+, you need to enable the "DayDream" in the Android display settings. Note that the system won't start the daydream if your display is kept awake. Make sure to disable the "Keep awake while charging" option in the Android developer settings (if you have enabled that before). On Samsung devices, make sure to disable the "keep display on while eye contact is detected" option (or how they call that). You can use the identifiers provided in the app to change the time and date format.

The app requires several permissions to function properly. It uses the Device Administrator permission to automatically lock the device when the daydream starts. It also requires permissions to show weather information, download RSS feed/weather/slideshow images, turn camera flashlight on, load RSS feeds from Google account, display upcoming events, show the number of missed calls, display unread SMS count, and cache RSS feeds.

Overall, Lucid is a useful app for those who want a customizable and functional clock display for their Android device. The free version is a good way to try out the app, and the full version is affordable for those who want to continue using it.