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What is Merlin?
Merlin is a browser-extension AI assistant that opens on any page with a shortcut, giving you chat across multiple models, summarizing, and writing help without leaving your tab. It also handles YouTube summaries, replies, and research tasks.
Key features
- AI chat sidebar on any website
- Multiple models (GPT, Claude, and more)
- Summarize pages, PDFs, and YouTube videos
- Writing and reply assistance inline
- Web-access answers
How to get started
- Install the Merlin extension
- Open it with a shortcut on any page
- Ask questions, summarize, or draft replies
- Switch models as needed
Use cases
- Summarizing articles and videos
- Quick writing help while browsing
- Comparing model answers
- Research without switching tabs
Merlin vs. alternatives
| Tool | How it compares |
|---|---|
| Merlin | A ChatGPT-style assistant on every website, via a browser shortcut. |
| Monica | Similar all-in-one assistant across sites. |
| ChatGPT | The standalone assistant many extensions wrap. |
FAQ
Is Merlin free to use?
Merlin's plans: Free plan, plus paid subscriptions. Pricing and free-tier limits change over time, so check the official site above for the latest details.
What is Merlin used for?
A ChatGPT-style assistant on every website, via a browser shortcut.
Who is Merlin best for?
Merlin is a good fit for summarizing articles and videos, or quick writing help while browsing.
What are the alternatives to Merlin?
Commonly compared alternatives include Monica and ChatGPT, see the comparison above for how they differ.
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CLast reviewed: 2026-08 · Reviewed by AIKetra editors · How we evaluate tools