This app was mentioned in 3 comments, with an average of 1.67 upvotes
I have not used it since mine are now under control, but this seems to be the new hi tech seizure tracking tool:
https://www.seizuretracker.com/
Edit: When I was having regular seizures I used Simple Seizure Tracker (Android) which worked well, but the data didn't export very well. https://play.google.com/store/apps/details?id=uk.co.lukewizzy.seizurediary
Yeah. "Simple Seizure Diary". It's decent, but the other day I noticed one I would have used instead.if I was still having them regularly. I'll find it and post back.
Here's the new high falutin` one: https://www.seizuretracker.com/
Simple Seizure Diary (Android): https://play.google.com/store/apps/details?id=uk.co.lukewizzy.seizurediary
Once you've added yourself to the beta program here: https://play.google.com/apps/testing/uk.co.lukewizzy.seizurediary
You can view the app here: https://play.google.com/store/apps/details?id=uk.co.lukewizzy.seizurediary