The phrase "as crazy as it sounds" is correct and usable in written English. You can use it to introduce an idea or opinion that is surprising or unusual. For example: "As crazy as it sounds, I think it might be useful to try skydiving.".
As crazy as it sounds, baseball was once celebrated for its speed.
So in due course, she joined an organisation, the American Civil Liberties Union, which passionately defends the bizarre church's right to express its provocative ideas.That is not as crazy as it sounds.
Not as crazy as it sounds, guys.
(This is not as crazy as it sounds.
That is not as crazy as it sounds.
Perhaps it's not quite as crazy as it sounds.
Firstly, this proposition is not as crazy as it sounds.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu