The page is very uninformative, I had to take clues from all around the site to realize this is ruby only. Also is not clear how it works, should I send a dump

The page is very uninformative, I had to take clues from all around the site to realize this is ruby only. Also is not clear how it works, should I send a dump of the crash to a external server? As a side note, it would be very useful to have a tool like this to debug iOS apps (and maybe integrated with crashlytics, I don't know if it's possible).