Glasp
AI social web highlighter that captures, annotates, and summarizes web pages and YouTube videos - used by 100K+ researchers and knowledge workers.
Glasp (Global As a Social Platform) is a browser-based web highlighter that lets users annotate webpages, capture YouTube AI summaries, and build a personal knowledge graph shared with the community. Founded in 2021 by Kazuki Nakayashiki and Kei Watanabe, Glasp has grown to over 100,000 users who collectively share thousands of highlights daily. Its AI summary feature processes YouTube transcripts into structured key points, saving time for researchers and knowledge workers screening large volumes of video content. The tool is entirely free, operating on a community sharing model where highlights can be made public to help others discover insights.
Key Features
- Highlight and annotate any webpage or article directly in the browser with color-coded notes
- AI YouTube summaries - generates structured key points from any video without watching it fully
- Kindle highlight import - sync all Kindle annotations into a unified searchable library
- Social discovery feed showing what your network is reading, highlighting, and annotating
- Export highlights to Notion, Obsidian, Roam Research, or CSV with one-click integrations
- AI-powered weekly digest email summarizing your accumulated highlights and reading patterns
Use Cases
- Researchers collecting and organizing highlights from academic papers, blogs, and online resources
- Students building a personal knowledge base from course readings and lecture video summaries
- Knowledge workers discovering what colleagues and thought leaders are reading in real time
- Writers capturing research snippets and source quotes for later reference without manual note-taking
Pros
- Completely free with no paid tier - powerful knowledge management with zero cost
- YouTube AI summaries save significant time when screening lengthy educational or conference content
- Social discovery layer is unique - no other web highlighter surfaces what your network is reading
Cons
- All highlights are public by default - privacy-conscious users must configure settings carefully
- Chrome extension only - no native desktop app or Firefox support for offline or non-Chrome users
- Exporting to Notion or Obsidian requires manual one-time integration setup per tool
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