Merlin AI
Merlin AI is an AI Chrome extension and web app that lets you use multiple AI models—ChatGPT, GPT 4, Claude, Deepseek V3, Opus, and more—right in your browser.
About Merlin AI
Merlin AI is an AI Chrome extension and web app positioned as an AI assistant that saves time and money. It brings multiple AI models—including ChatGPT, GPT 4, Claude, Deepseek V3, and Opus—together in a single product, so users can use these models without subscribing to each AI service separately. The product offers a free plan and a paid Pro plan: free users get a daily allowance of 102 queries and can run multiple models, while the Pro plan offers unlimited use of Basic models. Note that all features share a single fair use allowance (Fair Use Limits), so heavy use of one feature reduces the amount available for others, and Pro is not truly unlimited.
Best for
Best use cases
Switching between multiple models—ChatGPT, Claude, Gemini, Mistral, and more—in a single tool instead of subscribing to each service separately
Calling on the AI assistant for help with content anytime while reading, writing, or searching in the browser
On a limited budget, using the free allowance to try multiple models before deciding whether to upgrade to a paid plan
Compare before choosing
Per the official pricing page: subscribing separately to Claude AI costs $30/m, OpenAI $20/m, Gemini Advanced $20/m, Mistral AI $20/m, and open-source model hosting $40/m, while Merlin costs $19 per month (billed annually).
Official usage comparison: on the Pro plan, Claude Opus 4.6 allows up to 500 messages per month; the comparison point, ChatGPT Plus, is $20/month.
Features
Multiple top AI models
Access multiple AI models—including ChatGPT, GPT 4, Claude, Deepseek V3, and Opus—in one tool, usable directly in the browser extension or web app.
Chrome extension and web app
Summon the AI assistant while browsing via the Chrome extension; the Pro plan offers unlimited use of Basic models.
70+ AI tools
The official pricing page lists 70+ AI tools, with limited access on the free plan.
Cross-device sync
Both the Free and Pro plans support syncing across devices, keeping your account data consistent everywhere.
Image generation
The official pricing page includes basic image generation capability.
Pros
- One subscription gives access to multiple AI models including ChatGPT, GPT 4, Claude, Deepseek V3, and Opus
- Available both as a Chrome extension and a web app
- Includes a free allowance of 102 queries per day, so you can try it before deciding whether to pay
Cons
- All features share a single combined fair use allowance; heavy use of one feature reduces the amount available for others
- Merlin Pro is not unlimited; it is subject to Fair Use Limits, and hitting the cap affects feature availability
Pricing Plans
Free
- Limited access to Basic models
- Limited access to Plus-level models
- Basic image generation
- Limited access to 70+ AI tools
- Sync across devices
- Limited access to Chrome Extension features
Pro
- Unlimited access to Basic models
* Pricing information is for reference only. Please refer to the latest announcement on Merlin AI's official website.