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Freemium

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.

3.6 Productivity
3.6 Good 3.6
Access to multiple frontier models from one extension, no separate subscriptions Free tier has real limitations that push toward the paid S Plan
Reviewed by Challenging Voice Editorial · Updated Sep 2026 How we rate
PricingFree
Free planYes
CompanyHARPA AI
PlatformsWeb
CategoryProductivity
Last reviewedAug 2026
UpdatedSep 2026

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Ask AI about HARPA AI ChatGPT Claude Perplexity

Overview

HARPA AI is a browser extension combining multiple AI models with web automation: a single keyboard shortcut (Alt+A) brings GPT-5.4, Claude 4.6, Gemini 3.1, DeepSeek, Llama 4, and Perplexity directly onto whatever webpage a user is viewing, while automation features handle data extraction, form filling, and page monitoring in the background.

Hallucination-free AI responses alongside Google Search results, with source citations attached, is a meaningfully different design than a standalone chatbot – grounding answers in live search results and citing sources addresses the single biggest trust problem with AI-generated answers. Style-mimicking writing assistance for emails and articles, plus generation of 25,000-plus-word long-form content across 25 writing frameworks, extends the same multi-model access into serious content production rather than just quick page-level Q&A.

HARPA AI reports 500,000-plus professionals and teams using it across productivity, marketing/SEO, learning, copywriting, HR/recruiting, and software development. A free tier is available with limitations; the S Plan runs $12/month (annual billing) with CloudGPT access and chat history.

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

Screenshots & demo

HARPA AI screenshot 1

Pricing

HARPA AI offers a free plan, with paid upgrades for higher limits and more features.

  • Pricing modelFreemium
  • Starting priceFree
  • Free planYes
Visit HARPA AI

Pricing is provided as a guide. Check the official site for the latest plans.

Is HARPA AI expensive?

HARPA AI has no advertised paid tier. Among the 196 priced tools we list in Productivity, the median entry price is $10 a month.

71% of Productivity tools in the directory offer a free tier, and this is one of them.

Compared against every priced listing in Productivity, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

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

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

How it compares

ToolRatingFreeFromBest known for
HARPA AI (this tool)3.6YesFreeMulti-model AI access (GPT-5.4, Claude 4.6, Gemini 3.1, DeepSeek, Llama 4) via one shortcut
Merlin4.0Yes$15/moCtrl/Cmd+M shortcut for AI access on any website
UniJump3.4YesFreeIn-page AI chat access via keyboard shortcut or widget
MaxAI.me3.9Yes$30/moOne-click AI prompts embedded directly on websites like Gmail and LinkedIn

Alternatives to HARPA AI

4 tools matched to HARPA AI on what they do, their category and their price.

UniJump

3.4

Cmd+J anywhere on the web to summarize the page, rewrite a sentence, or translate on the spot – free, open source, no signup, stores no personal data.

Free Productivity
View details Visit

Jeda.ai

3.8

Visual AI workspace that turns prompts and files into strategy frameworks, mind maps and diagrams, from a free plan.

Freemium Productivity
View details Visit
Compare all HARPA AI alternatives →

Head to head: HARPA AI vs Merlin · HARPA AI vs UniJump · HARPA AI vs MaxAI.me · HARPA AI vs Jeda.ai

Frequently asked questions

What is HARPA AI?
HARPA AI is a productivity tool. 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.
Is HARPA AI free?
Yes, HARPA AI offers a free plan. Paid plans unlock more features and higher usage limits.
What are the best HARPA AI alternatives?
The closest matches in the directory are Merlin, UniJump, and MaxAI.me, compared side by side above.

Reviews

3.6 Editorial rating No reviews yet

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