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Head to head · 2026

HARPA AI vs Merlin

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

HARPA AI

Press Alt+A on any webpage to reach GPT-5.4, Claude 4.6, Gemini 3.1, DeepSeek or Llama -…

3.6Free

Visit HARPA AI (opens HARPA AI in a new tab)

Merlin

Browser AI assistant that brings ChatGPT, Claude, and other models to any website with one shortcut

4.0$15/mo

Visit Merlin (opens Merlin in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: HARPA AI does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    Merlin

    3.6 against 4.0

  • Same job?

    Yes

    Both are Productivity tools

Side by side

Compared onHARPA AIMerlin
Our rating3.64.0Better
Starts atFree$15/mo
Free planYesYes
CategoryProductivityProductivity
PlansFree
  • Free$0
  • Pro$29/mo, or $19/mo billed yearly ($228/yr)
  • Teams$19 per seat/mo, or $15 billed yearly ($180/yr); 2-seat minimum
Key features
  • Multi-model AI access (GPT-5.4, Claude 4.6, Gemini 3.1, DeepSeek, Llama 4) via one shortcut
  • Web automation - data extraction, form filling, page monitoring
  • Hallucination-free search-grounded AI responses with source citations
  • YouTube/video summarization with timestamp jumping
  • Long-form article generation across 25 writing frameworks
  • Ctrl/Cmd+M shortcut for AI access on any website
  • Access to GPT-4, Claude 3 Opus, Gemini, DeepSeek, and Mistral Large from one interface
  • Dedicated summarization for YouTube videos, PDFs, and articles
  • Native buttons inside Gmail, LinkedIn, and X for drafting content
  • Image generation across 20-plus models and aspect ratios
Pros
  • Access to multiple frontier models from one extension, no separate subscriptions
  • Search-grounded responses with citations reduce hallucination risk
  • Proven at real scale (500,000+ professionals) across diverse use cases
  • Free tier's 102 daily queries is generous enough for real evaluation before paying
  • Single subscription replaces separate ChatGPT Plus, Claude Pro, and Gemini subscriptions
  • Native integration inside Gmail and LinkedIn saves switching tabs constantly
Cons
  • Free tier has real limitations that push toward the paid S Plan
  • Browser-extension-only - no standalone app
  • Breadth of features (chat, automation, writing) may exceed what a casual user needs
  • 'Unlimited fair access' marketing overstates a Pro plan that's actually credit-capped
  • Real usage cap (around $100 of model cost) isn't disclosed upfront in plan marketing
  • Browser-extension dependence means no dedicated mobile app experience
CompanyHARPA AIFoyer, founded 2021

Prices come from each vendor's pricing page, last checked 20260826. Check the vendor before you buy.

FAQ

Questions people ask

Is HARPA AI better than Merlin?

In our reviews HARPA AI scores 3.6 and Merlin scores 4.0. The better pick depends on the job. HARPA AI: Press Alt+A on any webpage to reach GPT-5.4, Claude 4.6, Gemini 3.1, DeepSeek or Llama - plus browser automation for data extraction, form filling and monitoring, used by 500,000+ professionals. Merlin: Browser AI assistant that brings ChatGPT, Claude, and other models to any website with one shortcut.

Which is cheaper, HARPA AI or Merlin?

HARPA AI: free. Merlin: from $15/mo.

Do HARPA AI and Merlin have free plans?

Yes, both have a free plan.

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