Binglyst is an iPhone app for tracking what you watch, seeing when the next episode of your shows drops, and getting recommendations from your watching history.
Do I need an account? No. Tracking, search, recommendations, and reminders all work without signing in. An account is only needed for the Friends features.
How do I delete my account? In the app: Account tab → Delete account. This removes your sign-in credentials and your public friend profile.
Why do some titles show no plot or cast? The catalog updates nightly; very new titles can be sparse for a day or two.