Emdash

Emdash is a free, open service that uses AI to help you organize notes and highlights from books, articles, and other texts. It turns scattered excerpts into a structured knowledge system you can return to and learn from.

Organize highlights and notes

Emdash automatically structures the text snippets you save from ebooks and online articles. You can enrich each excerpt so key ideas don’t get lost.

• Tag and rate highlights
• Add your own notes and reflections to each excerpt
• Keep a consistent, searchable library of saved passages

Semantic search and related concepts

Built-in AI analyzes meaning on your device and surfaces “conceptual cousins”—passages with similar ideas across different authors. This helps you connect themes and revisit material from new angles.

• Semantic search for ideas, not just exact wording
• Find conceptually similar excerpts across your library

For learning-focused reading

Emdash is designed for people who read to learn—researchers, students, writers, product managers, and anyone working with lots of text. It supports building a personal knowledge base that’s useful for recall and study.