Too good to be true

So good that it is hard to believe, it seems unlikely

You can use this phrase in ………… language.

Spoken
Written
Formal
Informal

Example 1
I’m not surprised that they didn’t keep their side of the bargain. It sounded too good to be true.

Example 2
“I have found a perfect match for you! He’s young, handsome, successful…”
“He sounds too good to be true, what’s the catch?”