Best highlighting AI tools

Sideindexer is a powerful Chrome extension designed to revolutionize how you navigate and manage your AI conversations on platforms like ChatGPT, Gemini, and Claude. It provides instant indexing, persistent highlights, and advanced search capabilities, transforming lengthy AI chats into easily navigable knowledge bases.

Matter is a modern read-later app designed for avid readers. It allows you to save articles, newsletters, and threads into a clean, distraction-free library. A key feature is its advanced AI-powered text-to-speech, which converts any saved content into natural-sounding audio. With powerful highlighting, tagging, and integrations with knowledge management tools, Matter helps you not just read, but also retain and grow from what you consume.