Glarity

Glarity is a free AI browser extension that summarizes YouTube videos, search results, webpages, PDFs and emails, and translates pages side by side, built for people who want to get the gist of long content before deciding whether to read or watch it. It started as an open-source ChatGPT summary extension and grew into a broader reading assistant, while keeping its core features free and ad-free. Its YouTube tools, with timestamps and subtitle translation, are what most users install it for.

What is Glarity used for?

Glarity sits on the pages you already visit and adds a summary or translation layer on top of them. Most of its features trigger automatically or with one click.

• Summarizing YouTube videos with timestamped highlights, generated FAQs and translated subtitles
• Adding an AI summary next to Google search results to answer a query faster
• Summarizing articles, Twitter threads, Gmail messages and PDFs, and asking follow-up questions
• Translating whole webpages in a bilingual layout, plus selected text, PDFs and images
• Drafting emails and social media replies with the AI writer
• Chatting with more than ten AI models, with long context and image generation

Who Glarity is best for

Glarity suits students, researchers and curious readers who watch a lot of YouTube lectures or skim many articles, and language learners who like seeing the original text and translation together. It also fits people who use Safari or Firefox, where some competing extensions are missing. Teams that need admin controls, or anyone who mainly wants writing help inside work apps, should compare dedicated writing tools.

Glarity pricing

As of October 2026 Glarity describes its summary and translation extension as free and ad-free, and it can run on Glarity's own models or with your own OpenAI key. Glarity also sells a paid membership on its pricing page for heavier use of advanced models and AI chat, but the plan prices load only inside the page after sign-in, so they are not listed here. Open the pricing page in your browser to see current tiers before upgrading.

Limitations to keep in mind

• Summaries depend on available captions and page text, so videos without transcripts give weaker results
• The extension reads page content, so review permissions before using it on private or internal sites
• Paid tier details are hard to compare without signing in
• Many features overlap with all-in-one sidebars, so you may not need two tools

Glarity vs alternatives

Sider and Monica are all-in-one AI sidebars with broader writing, chat and image tools, and they make more sense if you want one assistant for everything in the browser. Merlin AI covers similar YouTube and webpage summaries with a strong focus on social media writing. NoteGPT is the better choice if you want to save video summaries as organized notes and study materials. HARPA AI adds automation and page monitoring. Glarity wins when you want free, focused summaries and translation across many browsers, especially for YouTube.

Tips for getting started with Glarity

Turn on the YouTube summary panel and set your preferred summary language so foreign videos come back in your language. Use custom prompts on webpages to pull out exactly what you need, like a list of claims or a comparison table. If you already pay for an OpenAI key, connect it to avoid limits on Glarity's built-in models.

Glarity FAQ

Is Glarity free?

Yes. Glarity's summary and translation extension is free and ad-free, and a paid membership is available for heavier use of advanced models and AI chat.

How does Glarity summarize YouTube videos?

Glarity reads a video's transcript and generates a summary with timestamped highlights in over a dozen languages, plus FAQs, translated subtitles and chat about the video.

Which browsers does Glarity support?

Glarity offers extensions for Chrome, Edge, Safari, Firefox and Opera, so it works for most desktop browser users.

What is the best alternative to Glarity?

Sider is the closest all-in-one alternative, and NoteGPT is better if you want to turn video summaries into organized study notes.