If you are on Android there are several apps that allow you to view your notification history like Unnotification[1] You can search as well but it doesn't sync

If you are on Android there are several apps that allow you to view your notification history like Unnotification[1] You can search as well but it doesn't sync, so the "viewable from any device" bit is not possible. It also deletes notifications older than 3 days by default, though you can configure this. I still find it very useful occasionally when I dismiss a message notification and then forget which app it was from. [1] https://unnotification.en.uptodown.com/android https://unnotification.en.uptodown.com/android