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Comparison

Sidenote vs Monica

Both live in a browser sidebar and will happily summarise a page or a PDF. Monica is an all-in-one AI copilot for chatting, writing, web search, translation and images across every device. Sidenote is a focused reader that grounds every answer in the exact source passage. Here is an honest comparison.

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Sidenote

A focused reader that cites every answer to the exact passage and validates it against the document.

Monica

An all-in-one AI copilot for chat, writing, web search, translation and images across web, mobile and desktop.

The short answer

Should you use Sidenote or Monica?

Choose Sidenote if…

You read documents you need to rely on and you want every answer pinned to a source passage you can click through to, across your PDFs, wikis and the web pages already open in front of you.

Choose Monica if…

You want one assistant that does a bit of everything, everywhere — many AI models, a writer, web search, translation and image generation, on your phone and desktop as well as your browser.

Plenty of people use both. Monica is the everyday Swiss-army copilot; Sidenote is the tool you reach for when the answer has to be right and provable.

Compared honestly

Sidenote vs Monica: feature by feature.

CapabilitySidenoteMonica
Citations scroll & highlight the exact passage Yes No
Server-side citation check drops unsupported claims Yes No
Reads the page or document you already have open Yes Yes
Works on private Confluence, Notion & SharePoint pages Yes No
Reads scanned PDFs with built-in OCR Yes Partial
One-click glossary of jargon & acronyms Yes No
Ask across many documents at once Yes Partial
Per-document Store / Discard retention control Yes No
Chat with & summarise a document Yes Yes
Searches the public web No Yes
Native mobile & desktop apps No Yes
Choice of multiple AI models & a developer API No Yes

Monica wins on reach and breadth — native mobile and desktop apps, a marketplace of AI models, real-time web search, translation and image tools — and we are not pretending otherwise. See where Monica is the better tool below. Sidenote trades that breadth for grounded, citation-checked reading. The cross-document row is powered by Sidenote Collections.

The core difference

An everything copilot, or a reader you can trust.

Monica is a generalist: many models to choose from, a writer, real-time web search, translation, image generation and PDF chat, on your browser, phone and desktop. If you want one assistant for the whole of your day, it covers a lot of ground.

Sidenote does one thing and goes deep: it turns the documents you read into something you can question and trust, with a citation on every claim and a click that scrolls the live page to the source. The server even re-checks each cited quote against the document and drops anything it cannot ground.

The difference in one example

Ask \"what does this contract say about termination?\" Monica gives you a fluent answer from the page and its models. Sidenote answers, checks that answer against the actual clause, and scrolls you to the exact sentence so you can confirm it before you rely on it.

Giving credit

Where Monica is the better tool.

Monica is a genuinely capable product with a far wider surface area than Sidenote. If these are what you need, Monica is built for it.

Everywhere you are

Native iOS and Android apps plus Windows and Mac desktop apps mean Monica travels off the browser entirely — Sidenote is a desktop browser extension with no mobile app.

A whole toolkit in one place

Chat, a writer, real-time web search, translation and image generation in a single sidebar, with a choice of models like GPT, Claude and Gemini and a developer API — far broader than Sidenote's focus on reading.

Pick your model

Monica lets you switch between many leading AI models for each task; Sidenote deliberately chooses the right model for you rather than handing you a marketplace.

FAQ

Sidenote vs Monica — common questions

If you want one sidebar that does a bit of everything — many models, writing, translation, images, web search, on every device — Monica is the broader product. If your job is reading documents and you need to trust the answers, Sidenote is the focused choice: it cites every claim to a source passage and scrolls the live page to it.
Trust and depth. Sidenote checks every answer server-side against the document and drops claims it cannot ground, then scrolls you to the exact cited sentence to confirm it. It also reads private Confluence, Notion and SharePoint pages in place, builds a one-click glossary, and lets you ask one question across many documents with per-document citations.
No. Monica has native iOS and Android apps and Windows and Mac desktop apps. Sidenote is a desktop browser extension (Chrome, Edge, Firefox, Opera) plus a web app, with no mobile app — it is built for reading on a computer.
No, and that is deliberate. Sidenote picks the model for the job — a fast one for everyday chat, a stronger one on the higher tiers for dense documents. Monica's strength is the opposite: a marketplace of models you choose from, plus a developer API.
For grounded reading, Sidenote's citation rigour is the differentiator: answers are validated against the source and every claim links back to the passage that proves it. Monica is excellent as a general copilot, but it is not built around verifiable, document-grounded citations.
Both have a free tier. Sidenote is free to install with a 7-day Pro trial that needs no card, and paid plans start at £10/month. Monica is freemium with a daily free allowance and paid plans (Pro, Pro+ and Unlimited) that unlock higher limits and its most advanced models.
Try it on a document

Read anything. With citations.

Add Sidenote to Chrome, open a document, and ask. Every answer comes with the passage that proves it.

Add to Chrome — freeSee pricing

7-day Pro trial · No card required · Free tier forever