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Comparison

Sidenote vs Glarity

Glarity is an AI copilot that summarises and translates YouTube videos, web pages, PDFs and email, with your choice of GPT-4o, Claude 3.5 Sonnet and Gemini. Sidenote is a citation-first reader that answers questions about the document you have open and links every claim back to the exact passage.

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Sidenote

Citation-first answers you can trust, grounded in the page you are reading.

Glarity

A cross-browser summariser and translator for YouTube, web pages and PDFs.

The short answer

Should you use Sidenote or Glarity?

Choose Sidenote if…

Choose Sidenote when you need answers you can verify — every claim cited to the exact passage, which the server checks and drops if it cannot ground it — across PDFs, articles and private Confluence, Notion and SharePoint pages.

Choose Glarity if…

Choose Glarity if your main jobs are summarising YouTube videos and translating web pages, you want to switch between GPT-4o, Claude and Gemini for those tasks, and you want a companion iPhone and iPad app.

Both live in the browser, both summarise and chat with documents, and both offer a free tier you can start without signing up. The real split is verification and reach: Sidenote grounds answers in the exact passage and reaches private team wikis, while Glarity is stronger at video summaries, full-page translation and mobile with its own iPhone and iPad app.

Compared honestly

Sidenote vs Glarity: feature by feature.

CapabilitySidenoteGlarity
Reads the page or document you already have open Yes Yes
Summarise a document Yes Yes
Chat with a document Yes Yes
Upload your own PDFs Yes Yes
Citations scroll & highlight the exact passage Yes No
Server-side citation check drops unsupported claims Yes No
Works on private Confluence, Notion & SharePoint pages Yes No
Ask across many documents at once Yes No
One-click glossary of jargon & acronyms Yes No
Per-document Store / Discard retention control Yes No
Summarise & translate YouTube videos No Yes
Full-page & image translation No Yes

Verified against Glarity's official site, App Store listing and current browser-store listings in July 2026. Glarity offers a choice of AI models (GPT-4o, Claude 3.5 Sonnet and Gemini) for its summarise, chat and translation features and ships a companion iPhone and iPad app; Sidenote is a desktop browser side-panel extension with a companion web app and reserves its most capable model for its top plans. The cross-document row is powered by Sidenote Collections.

The core difference

A summariser you point at content, or a reader that answers with receipts.

Glarity is built to condense and translate: it summarises YouTube videos, web pages, search results, Gmail and PDFs, and translates full pages, selections and images. Its answers are convenient, but there is no click-to-source citation that scrolls the live page and no server-side check that a quoted claim actually appears in the document.

Sidenote is built for verification: every claim is cited to the exact source passage, and clicking a citation scrolls the live page to that spot and highlights it. The server validates each cited quote against the document and drops anything it cannot ground, so you can trust the answer instead of re-reading to check it.

A concrete example

You are reading a 40-page vendor contract and ask what the termination notice period is. Glarity gives you a tidy summary paragraph; Sidenote answers with the clause quoted and a citation you click to jump straight to that line in the live PDF, so you can confirm it in one glance.

Giving credit

Where Glarity is the better tool.

Glarity is a capable, well-established tool, and there are jobs it does better than Sidenote. Here is where it genuinely shines.

Best-in-class YouTube summaries

Glarity is purpose-built for video: it summarises YouTube (and other video and news sources) in more than a dozen languages, with timestamped highlights, which is not something Sidenote does.

Translation across the whole page

Full-page side-by-side translation, selection translation and even image translation make Glarity a strong pick if reading across languages is a daily need.

Mobile and multi-model

Glarity ships a companion iPhone and iPad app and lets you switch between GPT-4o, Claude 3.5 Sonnet and Gemini across summaries, chat and translation, plus an AI writing and email-reply assistant.

FAQ

Sidenote vs Glarity — common questions

Glarity is a summariser and translator that condenses YouTube videos, web pages, Gmail and PDFs. Sidenote is a citation-first reader: it answers questions about the document you have open and links every claim to the exact passage, which the server verifies against the source. The gap is trust — Sidenote lets you confirm each answer in one click; Glarity gives a summary you take on faith.
No. Based on Glarity's official site and current listings, it does not offer citations that scroll the live page to and highlight the exact passage, and it has no server-side check that drops claims it cannot ground. That anti-hallucination workflow is Sidenote's core differentiator.
Sidenote reads private Confluence, Notion, SharePoint and OneDrive pages, Google Docs, Slack canvases and more, in place with no upload. Glarity focuses on public web pages, YouTube, search, Gmail and PDFs, so it is not aimed at private team wikis in the same way.
Yes. Glarity ships a companion Glarity AI app for iPhone and iPad (also on Mac) that summarises and translates web content on the go, alongside its browser extensions for Chrome, Edge, Safari, Firefox and Opera. Sidenote is a desktop browser side-panel extension with a companion web app and has no native mobile app.
Glarity is stronger at summarising YouTube and other video, at full-page and image translation, at letting you choose between GPT-4o, Claude and Gemini for those tasks, and it has an iPhone and iPad app. It also includes an AI writing and email-reply assistant. If those are your main jobs, Glarity is a good fit.
Both offer a free tier you can start without signing up. Glarity's core mode is free, with a paid Plus plan that guarantees a monthly quota of higher-tier GPT-4 queries; bringing your own OpenAI key can incur token-based costs. Sidenote is freemium with a 7-day Pro trial (no card) and paid plans from GBP 10 per month, with the most capable model on its top tiers.
See citation-first reading for yourself

Read anything. With citations.

Install Sidenote free and ask your next document a question — then click the citation to jump straight to the proof on the live page.

Add to Chrome — freeSee pricing

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