Google Keep

Google Keep is a general purpose notepad and list management service that is linked to your Google Account. This service synchronizes with all of your devices, including mobile phones, and can also be accessed from within a web browser via https://keep.google.com. On ChromeOS, you can use the Google Keep Android application to allow for offline access to your notes, as well as allowing you to take notes on your device lock screen without the need to unlock your ChromeOS device.