Readwise has two parts. Highlights gathers notes from Kindle, Apple Books, Kobo and many other sources and shows you a few each day so they stick. Reader is a read-it-later app for articles, PDFs, EPUBs, newsletters, RSS feeds and YouTube videos.
Users save content to Reader, highlight as they go, and let the Ghostreader AI summarise, explain or translate difficult passages. Highlights can be exported to Notion or Obsidian, turned into flashcards, and searched later. An API, MCP server and ChatGPT connector let AI tools access your library.
There is a 30-day free trial. Full Readwise (Reader plus Highlights) is $9.99 a month billed yearly, and Highlights alone is $7.99 a month billed yearly; monthly billing costs more.
Most useful if you already read a lot of English content digitally; it needs an international card after the trial.