I made a utility to check if one of the watched characters/players is online on arelith.
What is ti good for? Well, you can keep the app running minimized and check in intervals, if your friend (or enemy) came online.
You only need to put the (Case sensitive) names or part of the names of character or user account name to the list and click start.
Here's the link to download the tool: https://drive.google.com/file/d/1jNUvGc8E5X0CzYLQCg2lERTxOsdWGEZ9/view?usp=sharing