This app as a service is dead. But the developer has actually released the source code so you can set up an Open-source & Self-hostable version of Notice, which is very much appreciated in light of the money some of us have lost. It might not help all, but it might help some. If you're into that sort of thing, here are your links:

The org (some packages and plugins):
https://github.com/notice-github

Open Source Repo:
https://github.com/notice-github/notice