The Best Book Highlights Apps Compared (2026) | Chapterly Blog
Quick Answer: The best book highlights app depends on what you want to do with the highlights. For pure aggregation across Kindle, Apple Books, web, and PDFs, Readwise is the most capable ($7.99–$11.99/mo). For retention — actually remembering the underlying ideas months later — Chapterly is purpose-built; it converts highlights into spaced-repetition review and adds AI chapter discussion. For free, Kindle's built-in notebook and Apple Books work for casual highlighting but offer no review system. Anki is the most powerful spaced-repetition engine but requires manual card creation. Pick the tool whose review system you will actually use — collecting highlights you never revisit produces almost no learning. You've been highlighting passages in your books for years. But what happens to those highlights after you close the book? For most readers, the answer is: nothing. Highlights sit trapped in Kindle, Apple Books, or physical margins—never reviewed, never connected, slowly forgotten. A good book highlights app changes this. It gives your highlights a second life by organizing them, surfacing them at the right time, and helping you actually retain what you've read. Here's how the best options compare in 2026. What to Look For in a Highlights App Before diving into specific...