Telelogd
Keep up with your series episode by episode.
An episode by episode tracker for the series you are watching. Mark off what you have seen, see how far through a season you are, and keep notes as you go.
Open TelelogdWhere your data lives
On your device, in your browser, and nowhere else. There is no account to make and no server holding any of it. You can export the lot to one file whenever you want, and import it on another device.