Are there any blockexplorers that will track RingCT usage after the v4 fork?

Question

Statistics on mixin data is useful to anyone interested in privacy levels of Monero network transactions. I would like to track what percentage of transactions use RingCT between v4 activation and v5 enforcement.

Will there be RingCT statistics available starting the first day after the v4 fork?

Answer 1

Yes, the Onion Monero Blockchain Explorer supports RingCT. Currently it is:

the only explorer supporting Monero testnet network and RingCT,

More blockexplorers may add support in the coming weeks but I am not aware of any specific announcements.