Glasp

Glasp is a social web highlighter and knowledge management tool that lets you highlight and annotate content directly on web pages, PDFs, and YouTube videos. The browser extension makes it effortless to capture key insights as you browse, building a personal knowledge library over time. Its AI-powered features include automatic summarization of articles and YouTube transcripts, which is genuinely useful for research workflows. A standout feature is the social/community aspect " your highlights are publicly shared by default, creating a discovery layer where you can learn from what others are reading. However, this public-first approach may not suit privacy-conscious users. The free tier is generous enough for casual use, while the $12/month plan unlocks advanced AI features and deeper integrations. The interface is clean and intuitive, though the extension can occasionally feel sluggish on content-heavy pages. Compared to alternatives like Liner or Memex, Glasp differentiates itself with its social knowledge-sharing angle and solid YouTube integration. Best suited for researchers, students, and content creators who value collaborative learning.