Readwise

Readwise solves a subtle but costly problem: you read, highlight, take notes, and then forget almost everything. Readwise's spaced repetition system sends your own highlights back to you at increasing intervals, so what you learn actually sticks.

Readwise is a knowledge management platform combining two main products. The first is the highlight review system: it syncs highlights you've made on Kindle, Apple Books, Instapaper, Pocket, Kobo, PDFs and many other sources, and sends them back to you daily in a spaced repetition-based review session — a learning method that presents concepts at increasing intervals when you're close to forgetting them. The second product is Readwise Reader, an advanced reading app for articles, newsletters, PDFs, ebooks, YouTube videos and podcasts, with integrated highlighting, notes, text-to-speech and an AI assistant for asking questions about the text. All highlights made in Reader automatically flow into the review system. Readwise integrates with Notion, Obsidian, Roam Research, Logseq and many other note-taking and PKM (Personal Knowledge Management) systems. It's the preferred tool for those building a digital second brain who want their reading to genuinely transform their thinking.

For avid readers, knowledge workers, researchers and anyone who reads a lot and wants to actually remember and apply what they've read, with an integrated capture and review system.

Readwise offers a 60-day free trial (one of the longest in the category), with no credit card required. The Full plan includes both the review system and Readwise Reader, starting at $7.99 per month billed annually ($9.99 monthly). Reader is also available as a standalone product at $5.99 per month. Discounts are available for students and teachers. One subscription covers unlimited highlights and connected sources.