Polar is personal knowledge repository which supports advanced features like incremental reading, annotation, comments, and spaced repetition. It supports reading PDF, EPUB, and the web content.
PDF support We have first-class PDF support thanks to PDF.js. PDFs work well when reading content in book format or when reading scientific research which is often stored as PDF.
EPUB support Add any EPUB and we also capture web content to EPUB/
Captured Web Pages Download HTML content and save them as offline documents which can be annotated.
Pagemarks Easily keep track of what you're reading and the progress of each document.
Text Highlights Highlight text in PDF and web pages.
Area Highlights Capture a region of the page as a highlight which can be a chart, figure, infographic, etc.
Portable Run across any platform.
Packages for Windows, MacOS, and Linux are available on the downloads page.
We also have a CHANGELOG available if you're interested into what went into each release.
If it's a very technical issue it might be best to create a Github Issue.
Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]
Polar is distributed under the GPLv3.