Are they Still in Jail?

Track your favorite inmate(s) via Victim Information and Notification Everyday (VINE). They will, if you sign up, send notification of a change in status via email. They don’t cover everything online yet especially at the county and city level and I didn’t see any federal data in the spot checking I did.
I don’t know anyone in jail but I can see that this might be a very valuable service for someone who does be they victim, friend, or relative.