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Everything you need to understand a page.
Use core note tools and a fresh allowance of AI explanations each day.
- Free app download
- Notes stored on this device
- Daily AI explanations
- PDF text and diagram help
Simple by design
Free to use.
Pro when you need more.
The app is free to download and use without an account. Sign in only when you want a notebook that syncs, collaborates, and explains without a daily limit.
ProAccount required
Your notebook, everywhere and without limits.
For people who rely on Penombra throughout the day and want to work with others.
Unlimited explanationsCross-device storageCollaboration
Choose Pro Cancel through your billing account at any time. Your notes remain available to export after Pro ends. Privacy · Alpha terms