Glarity
FreemiumFree AI copilot that summarizes & translates any webpage, YouTube, Google, PDF, and more.
By Tanmay Verma, Founder · Last verified 03 Jul 2026
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Added 5d ago
77/100Safe BetIn short
Glarity — Free AI copilot that summarizes & translates any webpage, YouTube, Google, PDF, and more. Best for Students and researchers summarizing long videos and papers, Professionals who need fast cross-language summaries, Content creators repurposing video and web content. Free to start; paid plans from $9.99/mo.
Is Glarity actually worth it?
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Editorial Verdict
Best for
Students and researchers summarizing long videos and papersProfessionals who need fast cross-language summariesContent creators repurposing video and web contentMultilingual users wanting side-by-side translationAnyone who wants an all-in-one AI copilot for browsing
Not ideal for
Users seeking a standalone API or backend serviceThose who require offline summarization without an internet connectionEnterprises needing advanced admin controls and SSOUsers who prefer purely local AI processing (no cloud dependency)People who need deep integration with proprietary enterprise tools (e.g., Salesforce, SharePoint)
Glarity is an impressive free browser extension that packs powerful summarization and translation capabilities directly into your workflow. Its unlimited YouTube summary length and multi-model chat set it apart from ChatGPT. However, the Plus plan is still in testing, and heavy users may find free tier token limits restrictive.
Compare with: Glarity vs Kagi, Glarity vs Everlaw, Glarity vs Twistly
Last verified: July 2026
What independent users actually report about Glarity
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
7 mentions across 1 source (App Store).
43% positive57% critical
Recurring strengths
- +Free tier with unlimited YouTube summaries for Chrome users.
- +Works with multiple AI models: ChatGPT, GPT-4o, Claude 3.5, Gemini Pro.
- +Generates timestamped YouTube highlights and FAQ summaries.
- +Immersive side-by-side translation supports up to 10 parallel streams.
- +Very low API cost with GPT-3.5-turbo (~$0.10 per day according to users).
Recurring frustrations
- −Does not work reliably on Safari for Mac or iOS.
- −GPT-4 integration fails on iOS – endless loading loop.
- −Some users wasted API credits due to unresponsive loading.
- −No dedicated mobile app; only browser extension.
- −Positive reviews are mostly Chrome-specific; cross-platform experience is poor.
Patterns worth knowing
Safari/iOS compatibility is broken, causing frustration and 1-star reviews.
Seen on App Store
Chrome desktop version works well, especially for YouTube summaries.
Seen on App Store
API credits may be consumed without results, leading to distrust.
Seen on App Store
Learning curve
beginnerProductive in ~5 minutes
Hidden costs people mention
- • API key usage costs can accumulate if summaries don't complete – you pay for failures.
- • Pro features require a paid API key (e.g., OpenAI) – no flat subscription covers all model costs.
Viability Score
77/100
Safe BetHow likely is Glarity to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
momentum
55
funding runway
80
website health
90
wrapper dependency
100
Last calculated: July 2026
How we score →Key Features
- YouTube video summary with timestamped highlights
- YouTube video FAQ generation
- YouTube video subtitle generation & translation
- Google search result summary
- Any webpage summary
- PDF summary and interactive Q&A
- Twitter thread summary
- Immersive side-by-side webpage translation
- Text selection translation (web & PDF)
- Image translation
- AI writing assistant for emails and social media
- AI Chat with 200k context window & multiple models
- Unlimited image generation in AI Chat
- Customizable prompts for content extraction
- Gmail quick reply assistant
About Glarity
FreemiumBeginner-friendlyNo APIPlugin
Glarity is a free, open-source browser extension that acts as your AI copilot for cross-language reading and writing. It summarizes YouTube videos, Google search results, web pages, PDFs, and Twitter threads directly in your browser using models like GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro. Glarity also provides immersive real-time translation, AI writing assistance, and a versatile AI Chat with a 200k context window and unlimited image generation. Designed for students, researchers, and professionals, Glarity eliminates manual effort by generating timestamped video highlights, FAQs, and subtitles, and supports custom prompts for tailored content extraction. Unlike ChatGPT's gated token limits, Glarity's membership plans (including a free tier) offer unlimited-length summaries for YouTube and special websites, side-by-side translation at up to 10x parallel streams, and PDF support of up to ~300 pages. With over 1 million users across Chrome, Edge, Safari, Firefox, and Opera, Glarity integrates seamlessly into daily browsing. The extension can work with your own API key or Glarity's cloud service, and its source code is available on GitHub. Compared to ChatGPT, Glarity provides unlimited summary length for YouTube videos and special websites, multi-model AI chat, and parallel translation streams, making it a more versatile tool for content consumption and translation.
Behind the Verdict
Pick Glarity if you frequently need to summarize YouTube videos, translate web pages side-by-side, or interact with PDFs through Q&A. It's a genuine Swiss Army knife for online reading, especially if you consume content across multiple languages. Pass if you need offline operation or enterprise-grade admin controls. The free tier is generous, but power users may hit the Plus plan's quota limits. Glarity stands out from alternatives like ChatGPT by offering unlimited-length YouTube summaries and parallel translation streams. In practice, the extension is lightweight and responsive, but relying on third-party models means occasional API hiccups. The developer community is active, and the open-source nature adds transparency. For casual users, the free tier is more than sufficient, while the Plus plan (still in testing) promises faster speeds and higher quotas. Overall, Glarity is a smart addition to any browser for anyone dealing with content overload.
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Use Cases
- Summarize a 2-hour lecture video on YouTube in under 30 seconds with key timestamps.
- Translate an entire Japanese news article into English side-by-side while preserving layout.
- Generate a quick FAQ from a dense academic paper PDF to prep for a presentation.
- Compose professional email replies in Gmail with AI suggestions based on context.
- Chat with any webpage content to extract specific data without reading the whole page.
- Get instant summaries of Twitter threads and discussions without scrolling.
Models Under the Hood
GPT-4oclaude-3.5-sonnetgemini-1.5-proChatGPT
Limitations
- Free tier restricts YouTube and webpage summaries to 4K tokens (about 30 minutes of video or short documents).
- PDF summary is capped at 4 pages.
- Plus plan offers unlimited length but is still in testing and may change.
- The extension requires internet access and relies on third-party AI APIs (OpenAI, Anthropic, Google) whose availability and pricing are subject to change.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Annual total
Free
Over 12 months
Effective monthly
Free
Billed monthly
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Integrations
ChromeEdgeSafariFirefoxOperaYouTubeGoogleTwitterGmailPDF
Resources & Guides
Frequently Asked Questions
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