Highly for iOS - Medium-style highlighting in every app and website. 🖌
Readwise - Effortlessly rediscover and organize your Kindle highlights
LINER - LINER AI Copilot is currently powered by ChatGPT/GPT-4, Google Search Engine, and information from high-quality highlights of an enormous number of users from all around the world.
Clippings.io - Organize the notes you make on your Kindle
Highlight - "Highlight" physical books through conductive pages 📖✨
Klib - Kindle & iBooks Highlights Manager