Sidenote - AI Answers with Document Citations

AI answers with citations - verify every claim against your documents

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Updated Jul 2026 · Added Jul 2026

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What is Sidenote?

Sidenote is an AI summarizer and document chat extension that adds citations to every answer, ensuring claims can be verified against source material. It works on PDFs, web pages, Confluence, Notion, and other documents directly in your browser by extracting, chunking, and embedding content for instant semantic search. Built for teams and individuals who need reliable answers grounded in actual document content without hallucination.

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Key Features of Sidenote

Citations linked to exact source passages
Semantic search within documents
Document chat and Q&A
Auto-summarization
Glossary generation
Highlights and notes with persistence
Multiple export formats (Markdown, HTML, PDF)
Tab-based tagging and starring
Keyboard shortcut (Ctrl/Cmd+Shift+S)
Per-site pause toggle

Who Should Use Sidenote?

Summarize long Confluence runbooks and documentation

Chat with PDFs and research papers

Search Notion wikis by meaning

Extract key points from articles and blog posts

Build glossaries from technical documents

Review compliance and security documents with citations

Sidenote: Pros & Cons

✓Pros

Every answer cites exact source with scrollable verification
No hallucination - only claims supported by document content
Works on multiple platforms (Confluence, Notion, PDFs, web pages)
Free plan available with no card required
Caching means re-opening cached documents is free
Two data retention modes (Store or Discard)
Embeddings isolated per user in UK region with row-level security
Keyboard shortcut for quick access
Export in multiple formats

✕Cons

Edge and Opera support coming soon (currently Chrome and Firefox only)
Requires browser extension installation

Frequently Asked Questions about Sidenote

What documents does Sidenote work with?

Sidenote works with Confluence pages, Notion docs, PDFs, arXiv papers, Substack articles, and any web page or document you can open in your browser.

How long does Sidenote keep my documents?

You can choose between two retention modes: Store keeps the document indexed for the lifetime of your account, or Discard purges everything within 24 hours of upload.

Where are my embeddings stored?

All embeddings live in Supabase pgvector in the UK (eu-west-2) region, partitioned and isolated per user with row-level security policies enforcing per-account isolation.

Is there a free plan?

Yes, Sidenote offers a free plan forever with no card required, plus a 7-day Pro trial to try premium features.