Reviewers mostly see Heyday as a practical research and memory tool that helps them resurface browsing history, organize scattered notes and tabs, and quickly find information later. Several say it fits easily into existing workflows and supports meeting prep, coaching follow-ups, and writing from saved material, with the write feature standing out for turning notes and emails into useful drafts. The main criticism is reliability at the start: one reviewer says they could not get past the login page, limiting use despite strong interest.