CaptionIt is an AI-powered tool that helps users create funny, smart, and profound captions for their social media posts. The tool offers witty, deep, and cute captions that can be generated instantly. Users can use the hashtag #captionit or tag @captionit.ai on Instagram for a chance to have their posts featured on the site. The service is free and aims to make state-of-the-art AI accessible and easy to use for everyone.