This page runs the same rules as the production engine, on your machine, with no internet connection, no account and no installation. Everything below the line marked proof is the page checking itself against the reference engine's own output.
“water heater leaking all over basement need someone today 9145550163 rosa”
That is a real record from the demo set, word for word, including the missing punctuation and the number typed with no spaces. It is the whole input. Everything on the right of this page comes from text like that.