Every answer,
receipts attached.
Every answer cites the exact source you can verify. Sidenote is an AI summarizer and document chat for the PDFs, wikis and web pages in your browser.
Works on Confluence, Notion, runbooks, PRDs, and any PDF or article you can open. Click a citation and the page scrolls to the source. If the document doesn’t say it, Sidenote doesn’t either.
7-day Pro trial · No card required · Free plan forever
How Sidenote handles your data
Two retention modes per document, your choice. Store keeps the document indexed for the lifetime of your account so re-opening doesn't re-pay for indexing. Discard purges everything within 24 hours of upload via an hourly background sweep.
All embeddings live in Supabase pgvector in our UK (eu-west-2) region, partitioned per user. Row-level security policies enforce per-account isolation, so your content stays scoped to your account.
From cluttered tab to confident answer in three moves.
Open any page
A Confluence runbook, a PDF you just downloaded, an arXiv paper, a long Substack. Sidenote sits in the side panel of every tab.
Ingest once
We extract, chunk, and embed the page in seconds. Re-opening the same doc is free: it reloads from cache with no cap hit.
Ask with citations
Summarize, chat, explain, build a glossary. Every claim links to the exact passage. Click, and the document scrolls and pulses.
The small stuff is covered too.
Shipped, not roadmap: these are already in the extension you install today.
Built for internal wikis first.
Works on whatever else you open.
Confluence pages, Notion docs, runbooks, PRDs, PDFs (scanned ones too, OCR included), papers, articles, even Slack canvases. If it loads in your browser, Sidenote can read it.
Click a citation. Watch the source light up.
Every answer carries inline markers. Click one and Sidenote scrolls the page and pulses the exact passage. When the model bookends a topic by quoting first and last sentence, each cited sentence lights up on its own (try 7).
Sidenote offers two retention modes per document. Store mode keeps the document indexed for the lifetime of your account, or until you delete it. Discard mode purges everything within 24 hours of upload via an hourly background sweep.
All embeddings are stored in Supabase pgvector in our UK (eu-west-2) region, partitioned per user. Row-level security policies enforce per-account isolation at the database layer, so your content stays scoped to your account.
Chat answers stream over server-sent events; every claim is validated server-side against the retrieved passages before it leaves the API. Unsupported claims lose their citation automatically, and the model’s verbatim quotes are rectified to the chunk’s exact text so citation chips land on the precise passage.
Documents are content-hashed and shared across users, so two people ingesting the same source only pay once for indexing. Re-opening a document from cache is free and doesn’t count against the monthly cap, and runs on a separate, more generous hourly bucket.
Sidenote relies on two AI sub-processors. Anthropic provides Claude for chat, summaries, and explanations; Voyage AI provides the embedding engine. Anthropic retains prompts and responses for 30 days under their standard data policy, while Voyage AI does not retain embedding inputs. Both operate under no-training defaults on the API tiers we use.
Or try it live on your own link
Paste a URL or upload a small file. The real engine summarizes it and cites its sources. Click a chip to see the exact passage behind each point. No account needed.
Your library answers everywhere you work.
Ask across everything you’ve saved from Slack with /sidenote ask, turn a stale Confluence wiki into something that actually answers, and see how Sidenote compares to the notebook-style tools.
Picks up where ctrl-F gives up.
Same product, different roles. The common thread: you’re tired of re-reading the same documents to find one paragraph.
Engineering
Runbooks, RFCs, on-call playbooks, postmortems. Ask the wiki what we did last time and get the link to the doc that says so.
Product
PRDs, research transcripts, competitive notes. Synthesize across twenty docs without losing the receipts.
Customer Success
Knowledge-base articles, escalation runbooks, prior tickets. Get the answer with the source citation, ready to paste.
Legal & Ops
Policy docs, vendor contracts, compliance evidence. Quote the exact clause; never guess at it.
Research
Long PDFs, arXiv papers, lit reviews. Pull supporting passages straight into your notes.
Everyone else
Substacks, Medium long-reads, that 14,000-word Stratechery post. Sidenote works on whatever loads in your browser.
Everything we’d ask if we were you.
In their own words.
Sidenote delivers exactly what I was looking for: quick answers, reliable citations, and better understanding of complex documents.
I like that I can jot down ideas without opening a separate app or losing focus on what I’m doing. It’s simple, lightweight, and fits naturally into my workflow. Since installing it, staying organized has become much easier.
Stop digging. Start asking.
Add Sidenote to your browser, open any page in your wiki, and ask it the question you’ve been Slacking the team about.
7-day Pro trial · No card required · Free plan forever