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Work · October 22, 2015

Hibou – Use spaced repetition to remember what you read

Remember what your read. Little time, lots of knowledge.

Hibou – Use spaced repetition to remember what you read launched on October 22, 2015 with 69 votes, #1,069 of 4,175 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 11 years on.

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In plain words

Hibou is a browser extension that helps users retain information from web content. Users highlight interesting passages while reading, and the tool sends notifications prompting them to review those highlights at strategically timed intervals based on spaced repetition principles. By gradually increasing time between reviews, Hibou aims to combat natural forgetting patterns without overwhelming users with frequent review requests. It's designed for anyone wanting to build knowledge from online reading efficiently.

written from the facts on this page · September 2026

From the sources

Highlight interesting passages from web pages using the browser extension. Get notified to reread your highlights before you forget them. <!-- You'll get a desktop notification when it's time. How does Hibou know when? Using the magic of spaced repetition. Forgetting follows a predictable pattern. After reviewing a highlight, Hibou schedules the next review for a little more than twice the time since the previous one. Because the time between reviews increases exponentially, you're never bogged down with too many. You can nudge future reviews to be closer together or further apart depending on how familiar you are with the material. Information is useless if it is not applied to something…from gethibou.com

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