At the moment, steem.supply, one of the oldest DAPs on the STEEM blockchain, is not functional anymore. It was relying on the Steemit API node, which, probably, was shut down. It's not the only DAP which was hurt by the recent stake war, following the recent undelegations, many other projects found themselves unable to function.
But worry not, I intend to port this DAP on the new chain that is starting this Friday. It will be available at https://hive.supply.
As for steem.supply, I will evaluate later on if I have the resources and the time to still maintain it.
See you on the other side!