This one is correctly hooked into the schedule database so changes should be reflected fast. Also should have recording links, at least had them last year.
Congress – 35C3 https://itunes.apple.com/de/app/congress-35c3/id941205524?l=...
Congress – 35C3 https://itunes.apple.com/de/app/congress-35c3/id941205524?l=...
I think I used this one last year, was pretty good.