Summarise
TL;DR bullets, a one-paragraph overview, or a structured deep read — pick the length, get a clean markdown summary.
Read with citations
Read anything in your browser. With citations.
Sidenote summarises, simplifies, and answers questions about long PDFs, web articles, and Confluence pages — and shows you exactly where every claim came from. Click a citation, jump to the source.
7-day Pro trial — no card required. Free tier after that.
How it works
From cluttered tab to confident answer in three steps.
- 1
Install the extension
Pin Sidenote to your toolbar. Open the side panel on any document.
- 2
Index a document
PDFs, articles, Confluence pages, or upload a file. We process it in seconds.
- 3
Ask, and see the source
Every claim links back to the exact passage. Click to jump there in the original.
What Sidenote does
Four ways to read faster — without giving up accuracy.
Chat with citations
Streaming answers, every claim linked to the passage. Switch between threads, pick up where you left off.
Explain simply
Pull a passage, pick a reading level — like I'm 12, like I'm 16, layperson — and Sidenote rewrites without losing accuracy.
On-demand glossary
Jargon, acronyms, and proper nouns extracted with definitions grounded in the document. Click to find the first occurrence.
Citations
If the document doesn't say it, Sidenote doesn't either.
Every answer is checked against the retrieved passages on the server before it leaves the API. The model can't cite a source it didn't see, and the UI quietly drops any citation it can't verify.
Click a citation chip and the original document scrolls into view with the passage highlighted in amber. PDFs, Confluence, web articles — same flow.
Ground truth
Answers built only from passages we actually retrieved.
No silent hallucinations
Server validates every cited chunk ID before responding.
Click to verify
Each chip scroll-highlights the source passage in the original.
Hover to preview
See the cited text without leaving the chat.
Pricing
Two plans. Both honest.
Start free. Try Pro for a week without a card. Pay if you want to keep chatting.
Free
£0forever
Try Sidenote on a few documents a month. No card needed.
- 3 documents per month
- Standard-length summaries
- 10 explanations per month
- 3 glossary builds per month
Pro
£96per year
7-day free trial. No card required to start.
- Unlimited document ingestion
- Chat with citations across every document
- TL;DR / Standard / Detailed summaries
- Unlimited explanations at any reading level
- Unlimited glossary builds
- Streaming responses + thread history
- Cancel any time
Prices in GBP. VAT not currently charged. Cancel any time from the dashboard.
FAQ
Everything we'd ask if we were you.
Do you train AI models on my documents?
No. Anthropic and Voyage AI run with no-training defaults on the API tier we use, and we never fine-tune models on user content. Your documents are used only to answer your own questions.
Where is my data stored?
Document content lives in Supabase's eu-west-2 (UK) region, encrypted at rest. Each user can choose between Store mode (we keep the document for re-use) and Discard mode (we keep only the processed chunks needed for retrieval).
What language models does Sidenote use?
Anthropic Claude (Opus for chat and explanations, Haiku for chunk summaries and glossary extraction). Embeddings come from Voyage AI's voyage-3 model.
What kinds of documents work?
Browser-rendered PDFs, web articles (Readability extraction), Confluence pages (DOM extraction — no API setup needed), and uploads (PDF, DOCX, TXT, MD).
Do I need a card to start the trial?
No. Sign up with email, click the magic link to confirm, and your 7-day Pro trial starts. We only ask for a card when you decide to convert.
Can I cancel any time?
Yes — one click in the dashboard opens the Stripe Customer Portal, where you can cancel, change plans, or update your payment method. You keep Pro access until the end of the current billing period.
What about Confluence and other private docs?
Sidenote runs locally in your browser, so it sees the page exactly as you do. No OAuth, no admin install, no permissions to grant. Whatever you can read, Sidenote can index.
Why citations matter
Most reading-AI tools confidently make things up. Sidenote forces the model to cite the exact chunk it pulled the answer from, validates the IDs server-side, and refuses to invent a source. If the document doesn't have an answer, you'll be told plainly.
Read smarter. Cite everything.
Pin Sidenote to your browser today. Take it for a spin on the next dense PDF you have to plough through.