I tried to access Robosats today and everything was down. After asking questions on Simplex Chat I was pointed to a pinned notice in the Telegram group, copied below

Robosats is migrating its domains!

The usual clearnet and onion addresses are no longer available due to the original maintainer (@reckless_satoshi_v2) being out of contact for several months. In response, new domains have been created for both clearnet and Tor, and coordinators have agreed to make them the official ones from now on.

The following URLs are now available:

Onion (Best Option): http://robosatsy56bwqn56qyadmcxkx767hnabg4mihxlmgyt6if5gnuxvzad.onion (http://robosatsy56bwqn56qyadmcxkx767hnabg4mihxlmgyt6if5gnuxvzad.onion/)

Clearnet Docs: https://robosats.org (https://robosats.org/)

Unsafe Clearnet Dex: https://unsafe.robosats.org (https://unsafe.robosats.org/)

DNS redirection to onion: https://dex.robosats.org (https://dex.robosats.org/)

It's still safe and recommended to access other coordinators' URLs, especially in situations like this. Note that Android and Desktop apps have continued to work throughout this time.