Parent-picked video allow-list
Watchly
Yes
You hand-pick every video, playlist, or channel. If you did not add it, your child cannot watch it.
FamilyTime
Blacklist only
FamilyTime lets you block videos you have already seen in the history — a blacklist that can never get ahead of an open feed. Watchly is a whitelist: only the videos you added are watchable, so nothing slips through while you are not looking.