Sidenote vs Glarity
Glarity condenses and translates whatever you point it at; Sidenote answers about the document you have open, with every claim linked to the exact passage.
Citation-first answers you can trust, grounded in the page you are reading.
A cross-browser summarizer and translator for YouTube, web pages and PDFs.
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 and checked server-side, across PDFs, articles and private Confluence, Notion and SharePoint pages.
Choose Glarity if…
Choose Glarity if your main jobs are summarizing 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 summarize 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.
Sidenote vs Glarity: feature by feature.
| Capability | Sidenote | Glarity |
|---|---|---|
| Reads the page or document you already have open | Yes | Yes |
| Summarize 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 |
| Summarize & translate YouTube videos | No | Yes |
| Full-page & image translation | No | Yes |
Last reviewed: 3 July 2026.
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 summary, 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.
A summarizer you point at content, or a reader that answers with receipts.
Glarity is built to condense and translate: it summarizes 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.
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.
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 summarizes 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.
Sidenote vs Glarity: common questions
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.
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