HARPA AI
HARPA AI is a browser extension and AI agent that puts GPT, Claude, Gemini, DeepSeek, Perplexity and Llama inside any web page. It summarizes YouTube videos and PDFs, answers Gmail threads in your own tone, monitors pages and prices, writes long SEO articles and automates browsing tasks for professionals who work in the browser, with 500,000 users on Chrome, Edge, Firefox and Brave.
What is HARPA AI?
HARPA AI is a browser AI agent and extension that brings large language models into every web page you open. The product describes itself as "#1 AI agent for web browsing": you press Alt + A on any page and a sidebar opens with GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1 or Meta Llama 4 available, and the AI can see the page you are looking at. Instead of copying text into a separate chatbot, HARPA works with the page in place, which is the core idea behind the product.
Its most visible capability is summarization and reading assistance. HARPA includes a YouTube summarizer that extracts key takeaways from long videos, lets you jump to timestamps and lets you ask questions about the video content. The same engine handles PDFs, documents, blog posts and research pages. A separate Answer Engine returns cited answers next to Google search results, which the site positions as a hallucination-free alternative to a bare chatbot reply.
Writing and communication tools come next. The writer mimics your own style while drafting emails, tweet replies, LinkedIn cover letters and SEO-optimised articles of unlimited length, and the article generator can produce 25,000+ word pieces in 25 writing frameworks, working from outline to chapters with keyword refinement at every step. Quick shortcuts handle small edits: press F to finish a draft, G to check grammar, P to rephrase, T to translate, S to search or E to explain. A Gmail assistant categorises incoming mail, summarizes long threads and drafts contextual replies, which is why HARPA markets itself as a way to zero an inbox.
HARPA also behaves like an automation agent rather than only a chat assistant. You can set up web page monitors that periodically check a site and notify you when it changes, or price-drop and back-in-stock alerts for products on e-commerce sites such as Amazon, AliExpress, Walmart and eBay. Data scraping and web search automation can trigger IFTTT-style chains through Make.com, Zapier and n8n. Over 100 ready-made, page-aware commands cover marketing and SEO, charting, e-commerce, copywriting, learning, recruiting and general productivity, and each command can be edited or combined into your own workflows.
On pricing and access, HARPA runs on a free DEMO plan with limits and paid S-tier subscriptions plus a one-time X (lifetime) licence. Cloud usage is metered in Megatokens, where one Megatoken equals one million input tokens on efficient models, roughly 750,000 words of English text, with output tokens costing three times the input rate. HARPA states that it does not log your conversations and actions, supports local Llama models, is GDPR compliant and can be paired with your own API keys, so it can be used in environments that restrict sending data to third-party clouds.
HARPA AI Core Features
Multi-Model Chat
Access GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1 and Llama 4 from one sidebar on any page.
YouTube Summarizer
Pull key takeaways out of hours-long videos, jump straight to timestamps and ask follow-up questions about the content.
Answer Engine
Get cited, source-backed answers alongside Google search results instead of an unsourced chatbot paragraph.
Gmail Assistant
Categorize incoming email with AI, summarize long threads and draft contextual replies in your own tone of voice.
Page and Price Monitor
Watch any website for changes, or track price drops and back-in-stock events on e-commerce sites, with notifications.
Long-Form Article Writer
Generate 25,000+ word articles in 25 writing frameworks, refining or adding keywords at each step.
Automation and Integrations
Scrape data and trigger Make.com, Zapier or n8n chains to automate recurring browsing and research work.
100+ Ready-Made Prompts
Page-aware commands for marketing and SEO, charting, e-commerce, copywriting, learning and recruiting tasks.
Who is HARPA AI for?
HARPA AI is built for people whose working day happens inside a browser tab rather than inside a single SaaS app. That starts with knowledge workers who read and summarize a lot of material: analysts, researchers, consultants and students who need to turn long YouTube videos, PDFs, articles and reports into short, cited takeaways without exporting them to another tool. Marketers make up a large part of the audience, because HARPA combines page-aware prompting with SEO tooling. SEO specialists use it to audit pages, extract long-tail keywords, draft content calendars and generate very long articles with keyword refinement at each step. Social media and copywriting teams use the writer that mimics your style for LinkedIn posts, tweet replies, emails and cover letters, all inside the page they are already working in. Sales, recruiting and e-commerce operators use the scraping and automation side: extracting prospect or listing data from directories, monitoring competitor pages, tracking price drops and back-in-stock events on Amazon, AliExpress, Walmart or eBay, and pushing that data into Zapier, Make.com or n8n workflows. Because those tasks repeat daily, the ready-made prompt library and scheduled commands matter more to them than raw chat quality. Developers and technical teams use HARPA as a multi-model console: one subscription exposes GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro and Grok 4.1, and it also supports local Llama models or bring-your-own API keys for teams with strict privacy or cost requirements. Teams share command libraries through Spaces, which suits small agencies and content teams that want one standard summarization or writing workflow across several people. Finally, privacy-conscious professionals are a deliberate target audience: HARPA states that it does not log conversations or actions, that it is GDPR compliant, and that local models can be used instead of cloud models, which is why it gets adopted in environments where pasting company data into a random chatbot is not allowed.
HARPA AI Use Cases
Summarize a two-hour YouTube interview into key takeaways with timestamps before a meeting.
Clear a crowded inbox by auto-categorizing Gmail threads and drafting replies in your own tone.
Monitor competitor pricing pages and get alerted when a product price drops or a page changes.
Draft a 25,000-word SEO article from outline to chapters without leaving the browser tab.
Summarize a long PDF or research paper with citations while reading it online.
Scrape prospect or listing data from directories and push it into Zapier, Make.com or n8n.
Proofread, rephrase and translate emails, LinkedIn posts and tweets with keyboard shortcuts.
Compare the same prompt across GPT-5.4, Claude and Gemini before sending client-facing copy.
HARPA AI Pros and Cons
Pros
- Works inside any web page, so summarizing, drafting, translating and research happen without switching apps or copying text between tools.
- One subscription covers GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek, Perplexity Pro and Grok 4.1 instead of paying for several separate AI tools.
- The free DEMO plan is usable for evaluation, with 10 messages a day, up to 100 AI command runs and no credit card required.
- Privacy stance is explicit: conversations are not logged, local Llama models are supported and the product states GDPR compliance.
Cons
- The deepest automation features, including scheduled commands and unlimited power messages, sit behind paid S-tier plans, while the free DEMO plan is capped at 10 messages a day.
- Pricing is shown in euros with annual billing by default and cloud usage is metered in Megatoken credits, so monthly running costs are harder to predict for heavy automation use.
- As a browser extension it needs the browser open and is not a standalone desktop app or mobile assistant, and refunds are not offered.
FAQ About HARPA AI
HARPA AI Pricing
HARPA AI has a free DEMO plan with 10 messages a day and 100 AI command runs, then paid tiers billed annually: For Everyone at about EUR 14.3 per month (75 Megatokens a year), For Pros at about EUR 19.6 per month (225 Megatokens a year) and a one-time For Life licence at EUR 238.
Check official pricingDEMO
Free plan: ChatGPT, Claude and Gemini over web session connections limited to 10 messages a day, up to 100 total AI command runs, predefined and custom commands, and web monitors.
For Everyone (S1)
75 Megatokens per year, full CloudGPT model access (GPT-5.4, Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1, Llama 4), AI vision features, PDF/file/YouTube summaries, reusable commands, page and price monitors, unlimited power messages.
For Pros (S2)
225 Megatokens per year, extra seats at 10 percent off, everything in S1 plus scheduled commands and advanced automation for heavier research and monitoring workflows.
For Life (X)
One-time lifetime licence for a single user with 30 Megatokens included, unlimited web session connections for life and the option to bring your own API keys.
Megatoken top-up
Optional add-on: 20 Megatokens purchased at a 25 percent discount to extend CloudGPT usage at any time.
HARPA AI Alternatives
MaxAsk
MaxAsk is a free search engine run by Maxthon Limited. A query returns web results and image results on one page, and adding a question mark at the end of a query requests an AI answer. It runs in the browser, needs no account, and can be set as a browser default search engine. The same search service is built into the Maxthon browser.
Kolly
Kolly is a web platform for college applications that reviews essays with a model trained on essays accepted to top US schools, scoring six dimensions and marking the lines holding a draft back. It also tracks deadlines, builds school lists, matches scholarships and summer programs, reviews activities and honours, and runs a final read before submission.
Flowith
Flowith is a web-based agentic AI workspace built around an infinite canvas where AI agents and people work on the same task. It runs Deep Research, slides, websites, images and video, draws on 40+ premium models including Nano Banana Pro, GPT Image 2.5, Seedance 2.5 and Kling V2.6 Pro, and manages knowledge through the Knowledge Garden and Knowledge Market.