Glasp Inc.

Social web highlighter for saving, organizing and sharing highlights from web pages, PDFs and videos.

🇺🇸 San Francisco, California · Founded 2021

Pre-seedKnowledge managementProductivity softwareArtificial intelligenceSocial networkingEdtech

Glasp is a social web and PDF highlighter. Users highlight text on web pages, PDFs, YouTube videos and Kindle books, and keep it in a searchable library that is public by default. It adds AI features such as summaries, chat with documents and a personal AI clone built from a user's highlights. The company was founded in 2021 in San Francisco by Kazuki Nakayashiki and Kei Watanabe. Its stated mission is to democratize knowledge.

Products

ProductLive

Glasp Web & PDF Highlighter

Browser extension and apps for highlighting text online and keeping it in a searchable library.

Who it's for: Researchers, students, lifelong learners, writers and creators

Works on web pages, PDFs, YouTube videos and Kindle books
Available on Chrome, Safari, Edge, Firefox, iOS and Android
Exports highlights to note-taking and reading tools

ProductLive

YouTube Summarizer

AI summaries and clipping for YouTube videos.

Free plan includes 3 basic summaries per day
Paid plans add advanced summaries and channel tracking

ProductLive

Ask AI Clone and Chat with PDF

AI chat built on a user's own highlights and uploaded PDFs.

Chat with saved highlights as a personal memory
Upload PDFs and ask questions about them
Audio transcription included in plans

Customers

Individual users: researchers, students, lifelong learners, writers and creators. Educators and students get a discount on the Pro plan.

Traction

Updated Oct 2026

2,000,000+users

4.5Chrome Web Store rating

Funding

$400Ktotal raised

Pre-seed2022$400K

InvestorsGoodwater CapitalCyberAgent CapitalPhil LibinMike Greenfield

Team

Kei WatanabeCo-Founder & PMView profile