Readwise

Readwise helps you remember what you read. It automatically collects your highlights from Kindle, Apple Books, web articles, PDFs, podcasts and other sources into one place, then resurfaces them through a daily review using spaced repetition, so ideas stick.

Readwise also includes Reader, a powerful read-it-later app for articles, newsletters, PDFs, ebooks and YouTube transcripts. Reader's built-in AI, Ghostreader, can summarise documents, define terms, answer questions and generate flashcards as you read. Highlights can be exported automatically to note apps such as Notion, Obsidian, Roam and Evernote.

Good fit if you: read a lot and want your highlights organised, reviewed and connected to your notes.
Less ideal if you: rarely highlight or read long-form content.

Pricing: paid subscription with a free trial; Reader is included in the full plan.