The notebook that thinks with you.

Joined January 2025
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Introducing Feynman-3. A thinking partner that researches, edits, and works alongside you.
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Today, we’re excited to welcome Opennote to Reducto. Opennote built tools that help students understand, organize, and practice what they learned from their notes. That clarity of product thinking strongly aligns with our mission at Reducto: making unstructured information usable. We’re excited for what we’ll build together. Read more at our blog: reducto.ai/blog/reducto-acqu…
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Today, we’re excited to announce that Opennote has been acquired by Reducto! Over the past year, we've been building AI that works inside documents like a human would, and Reducto has been focused on building the infrastructure to make documents truly usable by humans and agents. From our earliest conversations, it was clear we were thinking about the same problem from different angles, and we’re incredibly excited for what we’ll build together.
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compact mode for smaller screens shifts content dynamically to place comments inline
ai proactively giving me comments on my work i haven't prompted anything all day
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ai proactively giving me comments on my work i haven't prompted anything all day
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Publishing on Opennote got an upgrade! Custom domains, site-wide search, better navigation, and more. You can also append .md to any URL for raw markdown, or hit /llms.txt for agent guidelines. All journals are AI-readable by default. Here's what it looks like: learning.opennote.space/e07d…
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There were 5 cancer breakthroughs this past week—pancreatic, colon, and glioblastoma. Keeping up was a full-time job. So we let Feynman research and add them to our lit review in 30 seconds.
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Introducing Papers, an AI-native academic writing suite. Feynman can help you do everything from finding references to peer review, all without leaving your editor. Here's how👇
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4/ Before you submit, Feynman acts as your most critical peer reviewer. It flags weak spots in your argument, checks if your citations actually support your claims, and ensures your logic is solid.
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Papers is the home for your best research drafting, with help at every step along the way. Try it for free at opennote.com
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Think, learn, create, and now multitask with Opennote, launching this week.
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just made all page navigation and journal operations 10x faster on @opennote 2026 off to a good start
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just shipped new checklists with inferred checking. simple but fun to build and use :)
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rebuilt the journal previews on the homepage to show rich content and be even more performant. no more placeholder junk. the small details matter :)
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Check out our new search system designed for the foundations of knowledge on Opennote!
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