CALCULUS · DERIVATIVES01 / 03
From an interval to an instant.
STUDY EXAMPLE / SELECT THE REGION BELOW
S / 01A PDF READER WITH AI Q&A
Read.Pick a part.Ask away.
Ask AI about a passage, figure, or code block. Your reading progress and conversations are saved locally for each book.
macOS 14+ Windows 11 FREE · OPEN SOURCE
SEE HOW IT WORKS01 — 04READING, WITH CONTEXT.Choose a passage and ask your question.
READ, ASK, REVISIT
Read and ask, in the same window.
Follow the example from reading a page to asking a question.
1 / 3 · Open a PDF
Example formula: find the limit of ((x + h)² − x²) / h as h approaches 0. The middle step is 2x + h.
Why does only 2x remain?
Expanding the numerator gives 2xh + h². Dividing by h gives 2x + h. As h approaches 0, the result approaches 2x.
- Open a PDF
Read the way you prefer.
Drop in a local PDF and use its outline to find a chapter. Choose single-page or two-page viewing and adjust the zoom.
Read text, scanned, and mixed PDFs. - Select a part
Select the part you want explained.
Select a passage, figure, or code block to ask AI about it. You can also ask about the whole page or follow up.
Select the middle line of the formula. - Return to the page
Compare the explanation with the original page.
Read the answer, then click its page reference to return to the text.
Read the explanation, then carry on.
02 / TRY A PAGE
Try asking about a selection.
Choose a derivation, a figure, or some code.
Select a part, read the answer, then follow up.
01Not complete: Select02Not complete: Ask03Not complete: Follow up
03 / YOUR LIBRARY
Pick up where you left off.
Your progress and Q&A are saved locally for each book.
01MATHEMATICS
Calculus Notes
Start with changeSATORI
02PROGRAMMING
Thinking in Code
One line at a timeSATORI
03READING
Reading Notes
A page to return toSATORI
Keep your place
Your page and zoom level are saved automatically. Switch between single-page and two-page views, and use the outline to jump to a chapter.
Review your conversations
Conversations are saved with each book and linked to their source pages, so you can review an answer and return to the text.
Connect an AI service
Use Alibaba Cloud Model Studio, OpenAI, or a compatible vision model. You can read and organize your library before setting up AI.
04 / YOUR BOOKS, ON YOUR DEVICE
You choose when to share a page.
PDFs stay in their original locations. Your library and Q&A are stored on your device, and API keys are kept in macOS Keychain or Windows Credential Manager.
Opening a book does not connect to AI. Satori sends page images to your chosen service only when you ask a question, request an explanation, or confirm outline recognition. See the provider’s privacy policy for how it handles those images.
Full privacy detailsYOUR NEXT READING SESSION
Open your PDF.
Start reading.
Free and open source. The app interface is in Simplified Chinese.
BEFORE YOU BEGIN
Do I need AI setup before reading?
No. You can open PDFs, read, and manage your library without AI. Configure an image-capable model service when you want to ask questions.
Does it support scanned PDFs?
Yes. You can read text-based, scanned, and mixed PDFs without AI. Recognizing a scanned table of contents requires a vision model; Satori shows which pages will be sent before you confirm.
Can I read on a phone or in a browser?
Satori is a desktop app for macOS 14+ on Apple silicon and Windows 11 on x64 or ARM64. This website contains preset demonstrations, not a browser client.
Are updates installed in the background?
No. Satori checks for updates at startup. You decide when to download and install them. Versions 3.4.3 and earlier need a one-time manual upgrade.