OctoNoteAI study notebook for Apple devices
Read PDFs, write with Apple Pencil, record the lecture, translate as you go, and ask an AI tutor about the exact thing you marked.
For an isolated system, a spontaneous process proceeds in the direction that increases total entropy.
The equality applies to a reversible process at equilibrium.
Start with the boundary: what can exchange energy with the surroundings, and what cannot?
One page keeps the whole story.
The broken study loop
Copy a formula.
Open a translator.
Paste into a chatbot.
Find the lecture again.
By then, the context is gone.The page, your handwriting, nearby text, and the question travel together.
Signature interaction
Choose Tutor, Quick Answer, or handwriting-to-LaTeX.
Cross the passage, formula, diagram, or handwriting that needs attention.
Ask, follow up, save the result, and return to the source without leaving the page.
For an isolated system, a spontaneous process proceeds in the direction that increases total entropy.
The equality applies to a reversible process at equilibrium.
Start with the boundary: what can exchange energy with the surroundings, and what cannot?
One continuous workspace
OctoNote follows the order learning actually happens, without flattening everything into a chat thread.
Move through lecture PDFs naturally while translated paragraphs stay with their source. Search, bookmark, change reading modes, and save useful words.
Entropy is a state function. Its change depends only on the initial and final states.
熵是状态函数。它的变化只取决于系统的初始状态和最终状态。
Write directly on PDFs with a tactile pen tray, then add notes, text, photos, shapes, and new paper pages. Your annotations remain separate from the source PDF until export.
thinking stays close to the source
Record while you write. OctoNote timestamps every stroke so a tap during review can jump back to the lecture audio that gave the note meaning.
Why does equilibrium make ΔS equal zero?
Questions can flow into a review notebook, vocabulary accumulates from translations, and smart outlines make long documents easier to revisit.
Built for trust
Your notes remain on your device unless you turn on Cloud Sync.
Selected text, imagery, and page context are sent when you use an AI feature.
Analytics is optional on this website. You can change the setting at any time.
OctoNote Pro
Start with a planned 14-day Pro trial. Subscription billing and final local prices are managed by the App Store.
Flexible access to every Pro workflow.
One focused term, about $6.66 per month.
The best fit for continuous study.
Reference USD pricing from the current product configuration. Availability, trial eligibility, taxes, and local prices may change before release.
Questions, answered
OctoNote is an AI study notebook for iPad, iPhone, and Mac. It combines PDF reading, handwriting, translation, lecture recording, contextual AI guidance, and review tools in one workspace.
Turn on AI mode, draw a diagonal line across the passage, formula, or handwriting you want help with, then ask. OctoNote sends the selected context to the tutor so you do not have to retype it.
Yes. OctoNote can present original and translated paragraphs together, cache translated pages, translate a selected region, and save useful words to your vocabulary list.
Yes. While recording, each handwritten stroke receives an audio timestamp. During review, tap a note to return to the moment it was written.
Notes stay on your device unless you enable Cloud Sync. Synced files travel over HTTPS and are stored per account. Selected context is sent to an AI provider only when you use an AI feature.
OctoNote is planned as a free download with a 14-day Pro trial. Current reference pricing is $8.99 monthly, $19.99 per three-month semester, or $69.99 yearly. Final local pricing is shown by the App Store.
Release status
OctoNote is in active development for iPad, iPhone, and Mac. App Store download and launch updates will appear here when the release is ready.
Ask for launch updates ↗