Merlin AI
AI browser extension with 10M+ users that brings ChatGPT, Claude, and Gemini to any webpage, email, or document via keyboard shortcut.
Merlin is a Chrome and Firefox browser extension that overlays AI capabilities on any webpage, allowing users to summarize articles, draft emails, ask questions about content, and access GPT-4, Claude, Gemini, and other models via a keyboard shortcut. Founded by Sudipta Biswas and Aman Gupta in 2022, Merlin has grown to 10M+ users and is one of the most-installed AI extensions on the Chrome Web Store. The tool is particularly popular for summarizing YouTube videos, LinkedIn posts, and PDFs without leaving the current tab. Merlin offers a generous free tier with 100 queries per day across all supported AI models, making it one of the most accessible multi-model AI tools available.
Key Features
- Multi-model access - switch between GPT-4o, Claude 3.5, Gemini, and Llama from the same keyboard shortcut
- Webpage summarization - highlight text or open the sidebar to summarize the full page instantly
- YouTube video summarization with timestamp-linked chapters and key point extraction
- Email drafting on Gmail and Outlook with tone and length controls built into the compose interface
- PDF and document AI chat - upload files or ask questions about any document open in the browser
- 100 free queries per day with no credit card required on the free plan
Use Cases
- Knowledge workers quickly digesting long articles and research papers without reading in full
- Professionals drafting email replies using AI assistance without switching apps or tabs
- Researchers summarizing YouTube lectures and video content for notes without manual transcription
- Students using AI assistance across any website for homework and research directly in the browser
Pros
- 10M+ users across Chrome and Firefox with a proven, stable extension after 3+ years of active development
- Multi-model flexibility - access GPT-4, Claude, and Gemini without switching apps or managing separate accounts
- 100 free daily queries with no credit card - genuinely useful for casual use before needing to upgrade
Cons
- Free tier limited to 100 queries per day - heavy users hit the cap quickly in research-intensive workflows
- Requires browser access to page content, raising privacy concerns for sensitive internal documents
- Slower response times compared to native ChatGPT or Claude apps due to extension request overhead
Merlin AI Alternatives
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AI browser sidebar with chat, writing, summarization, and translation - powered by GPT-4o and Claude with 200+ built-in tools and 4M+ users.
Harpa AI
AI browser automation agent for Chrome that monitors web pages for changes, extracts data, automates tasks, and chats with any site using your own AI API key.
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