Colab Notifier is a free Chrome add-on developed by baran yildirim. It is designed to notify users when longer running code cells are finished in Google Colaboratory.

If you are training models on Google Colaboratory and would like to be alerted when your code cells have completed running, Colab Notifier is a useful tool. This add-on sends you a notification as soon as your code execution is finished, allowing you to stay productive without constantly checking back on your code.

With Colab Notifier, you can focus on other tasks while your code is running, knowing that you will be notified when it's done. This is especially helpful for longer running tasks that may take a while to complete.

Overall, Colab Notifier is a handy Chrome add-on for those who frequently use Google Colaboratory and want to be notified when their code cells finish running. It provides a convenient way to stay updated on the progress of your code execution without constantly monitoring it.