zlacker

Can also use google sheet + app scripts + youtube api to add new videos from channels in playlists. Sheet can trigger every few hours to keep things up to date.

It does get more complicated if monitoring too many channels since execution will timeout due to sheets limit. But can make it to pickup where previously timedout.

Bonus using API gets you video info so you can filter by length (shorts), keywords etc. Limitation is ~150 videos added per day due to API limits.