Glasp: Social Web Highlighter & PDF Summarizer
Glasp is a free social web highlighter for researchers and learners. Highlight webpages, PDFs, and YouTube videos. Organize insights and share knowledge with...
NotebookLM (Google) is a free AI research assistant for analyzing documents and generating insights. Offers audio overviews of source materials with no subscription required.
About Glasp
Glasp is a social PDF and web highlighter that enables users to collect, organize, and share insightful ideas from the web. It allows users to highlight text directly on webpages, PDFs, and YouTube videos without context switching, storing all highlights automatically to their profile. With AI-powered features including summarization of web content, PDFs, and YouTube videos using ChatGPT, Claude, Mistral AI, or Gemini, Glasp transforms passive reading into active learning. Users can build a personalized AI clone from their highlights and notes, creating a dynamic knowledge-sharing experience. The platform emphasizes social learning and community knowledge-building. Glasp stands for "Greatest Legacy Accumulated as Shared Proof," embodying the commitment to democratize access to individual learning and experiences. Users can follow like-minded individuals, discover content through community highlights, and contribute to a collective knowledge base. The tool supports seamless integration with popular note-taking applications including Notion, Obsidian, Roam Research, and others, enabling users to export highlights in multiple formats (Markdown, HTML, CSV, JSON). Glasp serves researchers, students, writers, professionals, and lifelong learners who want to enhance their research productivity and build a personal knowledge management system. With over 1 million users worldwide, the platform has become essential for those seeking to capture insights, organize knowledge, and collaborate with a community of learners.
Pricing
Free tier with unlimited public highlights, 3 YouTube summaries/day, 5 PDF uploads, 30 mins audio transcription monthly. Pro plan at $12/month (or $10/month annually) includes unlimited private highlights, 1,000 YouTube summaries, 100 PDFs, 300 mins audio, Notion auto-sync. Unlimited plan at $30/month offers unlimited everything with 5,000 YouTube summaries, 1,500 mins audio, and priority support.
Key Features
- Web & PDF Highlighting: Highlight and annotate text directly on webpages, PDFs, and YouTube videos with multiple color options without leaving the page
- AI-Powered Summaries: Generate intelligent summaries of webpages, PDFs, and YouTube videos using ChatGPT, Claude, Mistral AI, or Gemini
- AI Clone Feature: Build a personalized AI clone from your highlights and notes that learns from your interests and provides tailored insights
- Social Learning Network: Follow like-minded readers, discover insightful content from community highlights, and learn from others' annotations
- Multi-format Export: Export highlights and notes to Notion, Obsidian, Roam Research, Evernote and other tools in Markdown, HTML, CSV, or JSON formats
- Kindle Integration: Import highlights and notes from Kindle eBooks and review them daily with export capabilities
Pros
- Seamless highlighting workflow without context switching
- Comprehensive social learning features enabling discovery from like-minded readers
- AI-powered summaries using leading language models
- Free tier with unlimited public highlights and basic features
- Extensive integration ecosystem with 10+ note-taking apps
- Supports multiple file types and content sources
- Personal AI clone for knowledge management
Cons
- Public-by-default sharing may not suit professionals handling sensitive information
- Search and organization features could be stronger when managing large highlight libraries
- Limited mobile app support for PDF highlighting and image annotation
- Private highlighting requires paid subscription
- Highlighting may not work reliably on all websites without page refresh
Frequently Asked Questions
Is Glasp free to use?
Yes, Glasp offers a free tier with unlimited public highlights, basic YouTube summaries (3 per day), up to 5 PDF uploads, and 30 minutes of audio transcription per month. Paid Pro ($10-12/month) and Unlimited ($25-30/month) tiers unlock private highlights, more summaries, and advanced features.
What AI models does Glasp use for summaries?
Glasp supports multiple AI models for summarization including OpenAI's ChatGPT, Anthropic's Claude, Mistral AI, and Google's Gemini. Users can select their preferred model in settings.
Can I export my highlights to other tools?
Yes, Glasp integrates with 10+ note-taking and knowledge management tools including Notion, Obsidian, Roam Research, Evernote, OneNote, and others. You can export in Markdown, HTML, CSV, or JSON formats.
What is an AI Clone in Glasp?
An AI Clone is a personalized AI assistant trained on your highlights and notes. It learns from your reading history and can answer questions based on your knowledge, suggest relevant articles, and provide insights aligned with your interests.
Does Glasp have a mobile app?
Yes, Glasp offers iOS and Android mobile apps that support browsing bookmarks, Kindle highlights, and YouTube summaries. However, PDF highlighting is currently limited on mobile devices as of October 2025.
Are my highlights public by default?
Yes, all highlights are public by default on Glasp, enabling the social learning features. Private highlights require a paid Pro subscription. You can manage visibility per article.
How does Glasp's social learning work?
Glasp allows you to follow like-minded readers and see their highlights. When others read the same article, you can see their annotations and learn from their perspective. This creates a collaborative knowledge-building experience where everyone benefits from collective intelligence.