Heyday is an AI-powered memory assistant that helps you automatically resurface forgotten content while browsing the web. It enhances search and knowledge base by saving the pages you visit and resurfacing them alongside search results. It also organizes and resurfaces various documents, messages, files, tweets, and more from different platforms. Heyday is secure, private, and offers a 14-day free trial. Monthly pricing starts at $19, and the tool has received positive reviews from users.