Pricing: Free
Updated: September 2026
Merlin brings ChatGPT, GPT-4, Claude, Llama to websites for email writing, summarization, coding.
Free tier (verified July 2026): Free browser extension tier
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Editor-selected listing
Independent & reader-supported
Pricing & free tier — last checked
How we checked: we tried to read the vendor's page and were blocked — details below — source
Its entire pricing field was a two-word absolute, written for a product that meters usage. Withdrawn.
| What | What we found | Status |
|---|---|---|
| 'Completely free' / 'Free unlimited basic usage' | Withdrawn as unsupportableMerlin meters free usage. We could not source the current allowance, so we publish no number rather than substituting a guess. | Changed since last check |
| Free tier exists | Yes — free to start, no credit card required | Confirmed |
Editor verification notes
- Removing an unsupportable absolute never requires the vendor's confirmation; replacing it with a specific figure would.
Checked by the TheToolsVerse Verification Desk — by reading the vendor's own published pages, not by testing the product in an account. Merlin can change prices at any time without notice. The date above is the last time we looked; if it looks old, treat every figure here as unconfirmed and check Merlin directly before paying.
How we verify →Editor's Verdict
Official ReviewMerlin embeds GPT-4, Claude, Llama, and other models directly into Gmail, Google Docs, LinkedIn, and Twitter without tab switching — and the free tier is genuinely unlimited for basic queries. It works well as a browser-side AI shortcut layer for writers, marketers, and researchers who want AI contextually rather than in a separate window. Model quality ceilings depend on the upstream providers; Merlin itself adds convenience, not capability.
Reviewed by Sohail Akhtar
Lead Editor & Founder
Pros
What we like
- Access to multiple AI models (GPT-4, Claude, Llama) from a single browser extension
- Works natively inside Gmail, Google Docs, LinkedIn, and Twitter without leaving the page
- Free to start with no trial period or credit card required
- Instant article and email summarization directly in context
Cons
Limitations
- Model quality depends entirely on upstream providers — Merlin adds access, not AI improvements
- Requires browser extension permissions that read page content across all sites you visit
- Heavy GPT-4 usage may require a paid upgrade once free-tier limits are reached
Pricing
✓ Free tier re-verified July 2026: Free browser extension tier
| Plan | Details |
|---|---|
| Free tier | Free to start, no credit card required. Merlin meters usage on the free tier rather than offering it without limit, and we could not source the current allowance, so we publish no figure for it. Checked 6 September 2026. |
Free to start, with no credit card required. Merlin meters usage on its free tier rather than offering it without limit, and we could not source the current allowance to publish here — an earlier version of this page simply asserted it was completely free, which was more than we could support. Check the quota shown in the extension itself. Reviewed 6 September 2026.
What is Merlin?
Merlin Chrome extension embeds multiple AI models (ChatGPT, GPT-4, Claude 2, Llama 2) directly into Gmail, Google Docs, LinkedIn, Twitter for instant email writing, article summarization, code generation, and content creation. Productivity users reach AI on any page without switching tabs. There is a free tier; we have withdrawn the claim that it is unlimited, because Merlin meters usage and we could not source an allowance to publish in its place.
Associated Tags
chrome ai extension, gpt-4 browser ai, gmail ai writer, linkedin ai assistant, multi-model ai access
Key Features
ChatGPT/GPT-4/Claude access
Gmail/Docs/LinkedIn integration
Article summarization
Code generation anywhere
No tab switching needed
Real Use Cases
How professionals leverage Merlin - Chrome AI Extension with ChatGPT GPT-4 Claude Access
Discover practical workflows and real-world scenarios where Merlin delivers key solutions.
01
Writers drafting and editing emails in Gmail without switching to a separate AI chat window
02
Marketers generating LinkedIn post copy or Twitter thread drafts directly in-context
03
Researchers summarizing long articles, PDFs, or documentation pages while reading them
04
Developers generating code snippets while working inside GitHub or technical documentation
Top Alternatives
Dedicated alternatives page →Free
Sider
Chrome extension sidebar AI - free access to GPT-4o/Claude 3.5/Gemini on any webpage. Summarize/translate/write without tab switching. 2M+ Chrome Web Store users.
Paid
Claude in Chrome
Anthropic's browser extension: reads the page you are on, then clicks, types and fills forms. Requires a paid Claude plan.
Freemium
Monica AI
All-in-one AI assistant with GPT-5.2, Claude, and Gemini — browser extension, desktop, and mobile app.
Freemium
Ninja AI
Ninja AI provides access to 20+ AI models including GPT-5.2, Claude, and Gemini alongside autonomous agent automation for research, coding, and content tasks.
Frequently Asked Questions
Which AI models does Merlin support?
ChatGPT, GPT-4, Claude 2, Llama 2 with model selection.
Does it work in Gmail?
Instant email writing, reply generation, summarization in Gmail compose.