Meazure - What are the dimensions of that image? How big is this window?
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Houseparty - Brining empathy to online communication.
On-Screen Ruler - lightweight, free, semi-transparent ruler
Messenger Day by Facebook - Share your day in Messenger