If you need a tool to help you zero in on the parts of a YouTube video you're interested in, Video Highlight is a top contender. The AI-based tool can summarize videos and take notes, transcribe videos automatically and offer timestamped summaries. It also offers smart search, highlighting and integration with the Notion note-taking tool. That makes it a great option for market research or getting a quick handle on what a video is about.
Another good option is ChatTube, which offers live video chat and AI-generated video summaries. You can ask questions and get answers related to the video, find the most important moments and even translate video text. It's geared for teachers, students and content creators, but there are various pricing levels depending on your needs.