Plum is a keyboard-driven, AI-assisted PDF reader for macOS, built for people who read
research papers seriously.
Most AI reading tools chat about a document. Plum's assistant works on it:
ask a question and it jumps to the passage and highlights the exact lines that answer it, so
you can check the source at a glance instead of trusting a summary. It reads pages, follows
references, and searches across everything you've opened.
Around that sits a real reading environment: modal and keyboard-first, with buffers,
search, a command palette, and enriched citations, equations, and references. Under the
hood, Plum turns each PDF into a structured, searchable model, and the assistant can run on
the AI you already use. See how it works.
Frequently asked questions
What is Plum?
A keyboard-driven, AI-assisted PDF reader for macOS that helps you read, understand, and search research papers. Beyond chatting about a document, its assistant acts on the page: searching your library, reading pages, and highlighting the exact lines it means.
What platforms does Plum support?
macOS, as a native SwiftUI app. There is no web or mobile client today.
Do I need my own AI subscription or API key?
You can use your own AI (connect a tool like Claude, or bring your own API key), or use the built-in assistant with an active subscription. The reader itself is free.
Can I trust what the assistant highlights?
It highlights the exact lines on the page, so you can verify them at a glance. The built-in assistant only highlights text it actually found in your document, not something it invented.
How does Plum handle my documents and privacy?
Uploaded PDFs are processed and stored so your library is searchable, and documents are deduplicated by content hash so each paper is processed once. See the Privacy page for details.