HARPA AI
Multi-LLM browser agent for web automation and AI assistance
HARPA is the most versatile multi-model AI browser extension we've tested, but the free tier is heavily token-gated. If you regularly switch between models and need automations like price tracking or email management, it's a steal. For single-model users, a simpler, cheaper extension might be better.
Verified 17d ago · liveness 77/100 · cite: rightaichoice.com/tools/harpa-ai
- Professionals who switch between multiple LLMs (GPT, Claude, Gemini, etc.) in one tool
- Marketers and SEO specialists wanting to audit, generate articles, and track SERP changes
- E-commerce shoppers tracking price drops and back-in-stock alerts on major sites
- Heavy email users wanting AI-assisted inbox management and drafting
- Users who only need a single AI chat model and don't need web automation
- Those seeking a full-featured free tier with decent token allowance (free DEMO is limited)
- People uncomfortable with browser extensions having page access (despite GDPR compliance)
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Skip HARPA AI if you only need a single chatbot and never want to read or automate web pages.
Free plan: 75 Megatokens/year — heavy users will need to top up or upgrade
At $19/mo Pro (annual), HARPA replaces ChatGPT ($20/mo), Claude ($20/mo), Gemini ($20/mo), Grok ($30/mo), Perplexity ($20/mo), and DeepSeek ($20/mo) in one extension — potential savings of $110+/mo. The For Everyone plan at $12/mo is a cheap entry point but lacks scheduled commands. Life plan at $240 one-time is only for single users and limited tokens. More expensive than ChatGPT Plus alone, but cheaper than subscribing to all models separately.
In short
HARPA AI — Multi-LLM browser agent for web automation and AI assistance. Best for Professionals who switch between multiple LLMs (GPT, Claude, Gemini, etc.) in one tool, Marketers and SEO specialists wanting to audit, generate articles, and track SERP changes, E-commerce shoppers tracking price drops and back-in-stock alerts on major sites. Free to start; paid plans from $12/mo.
Viability Score
How likely is HARPA AI to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Access GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1, Llama 4
- Summarize YouTube videos with timestamps
- Gmail assistant: categorize, summarize, draft replies
- Writer mimics your writing style for emails, articles, social posts
- Generate SEO-optimized articles of unlimited length
- AI-driven SEO audit and keyword extraction
- Track price drops and back-in-stock on Amazon, AliExpress, Walmart, eBay
- Monitor web pages for changes with alerts
- Build custom GPT agents with page access
- Schedule commands for recurring tasks (Pro and Life)
- 100+ prebuilt page-aware prompts
- Quick shortcuts: finish draft (F), grammar check (G), rephrase (P), translate (T)
- Midjourney/DALL-E prompt wizard with 30+ templates
- Local model support (Meta Llama) for privacy
- Automate web workflows with Zapier, Make.com, n8n
About HARPA AI
HARPA AI is a Chromium browser extension (Chrome, Edge, Brave) that brings together multiple AI models—GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1, and Meta Llama 4—into one interface on any webpage. Unlike single-model chatbots, HARPA can read and act on page content: it summarizes YouTube videos with timestamps, manages Gmail (categorize, summarize, draft replies), writes in your style for emails, articles, and social posts, and generates SEO-optimized articles of unlimited length. Its price-tracking and page-monitoring features alert you to drops and changes on e-commerce sites like Amazon, AliExpress, Walmart, and eBay. For marketers, it offers AI-driven SEO audits, keyword extraction, and content calendars. Power users can build custom GPT agents with page access, set up scheduled commands (on Pro and Life plans), and automate workflows via Zapier, Make.com, or n8n. HARPA also includes over 100 prebuilt page-aware prompts, quick shortcuts (finish draft, grammar check, rephrase, translate), and a Midjourney/DALL-E prompt wizard. Privacy is a focus: local model support (Meta Llama), no conversation logging, GDPR compliance, and optional use of your own API keys. Compared to standalone browser AI assistants like Monica or Sider, HARPA offers broader model choice and deeper automation, but its free tier is token-limited. It essentially replaces multiple subscriptions (ChatGPT, Claude, Gemini, Perplexity, DeepSeek, xAI Grok) with one tool for a lower combined cost.
Behind the Verdict
HARPA's biggest strength is its model diversity: you can query GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1, and Llama 4 without juggling tabs. That alone is worth the price for anyone who benchmark models or wants the best answer for each task. The page-aware actions are also slick—summarizing YouTube videos with timestamps, extracting data from any page, and auto-filling forms. Where HARPA stumbles is the free tier: 75 Megatokens per year on Everyone plan sounds generous, but tokens burn fast on long articles or multiple queries. The Life plan ($240 one-time) only comes with 30 Megatokens, which is surprisingly stingy—you'll likely need to top up or use your own API keys. Compared to Monica or Sider, HARPA's automation (scheduled commands, Zapier integration) is more advanced, but those competitors often have more generous free tiers. Also, HARPA requires a subscription for most useful features; the free DEMO plan is very limited. In practice, HARPA is best for professionals who use AI heavily across multiple domains and want everything in one browser sidebar. Casual users may find the token math frustrating.
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Real-world workflow fit
Concrete scenarios for the personas HARPA AI actually fits — and what changes day-one when you adopt it.
After publishing a blog post, open the page and use HARPA's SEO audit prompt to extract keywords, check readability, and get improvement suggestions. Then schedule a weekly monitor to track SERP ranking changes.
Outcome: You have a repeatable SEO audit and monitoring routine without leaving the browser.
While browsing Amazon, click HARPA to set up a price drop alert for the product. HARPA will notify you via email when the price drops.
Outcome: You catch price drops automatically, saving time and money.
Open a YouTube video on your research topic. Use HARPA's YouTube summarizer to extract key points. Then ask HARPA to generate an SEO-optimized article outline based on the summary.
Outcome: You go from video to article draft in minutes, maintaining your own writing style.
Use Cases
- Monitor competitor product pages for price drops and get email alerts
- Summarize a 2-hour YouTube video into key takeaways with timestamps
- Scrape job listings from multiple sites and extract skills/requirements into a spreadsheet
- Automate daily SEO audits of your website and generate improvement reports
- Craft personalized LinkedIn outreach messages using your writing style
- Translate and explain foreign language articles with grammar corrections
- Generate SEO-optimized blog articles from YouTube transcripts
- Set up a page monitor to check stock availability and auto-refresh
Models Under the Hood
as of 2026-07-14
Limitations
- Free plan users get only 75 Megatokens per year, which may limit heavy automation.
- Advanced features like scheduled commands and advanced automation are gated behind the Pro plan ($19/mo).
- The extension works only on Chromium browsers; no native Safari or Firefox support.
- Token consumption for large-scale scraping or frequent monitoring can be significant.
as of 2026-06-26
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published HARPA AI tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Everyone
$12/mo, billed annually
Pro
$19/mo, billed annually
Life
$240 one-time
Where the pricing makes sense
The company stage and team size where HARPA AI's pricing actually pencils out — and where peers do it cheaper.
At $19/mo Pro (annual), HARPA replaces ChatGPT ($20/mo), Claude ($20/mo), Gemini ($20/mo), Grok ($30/mo), Perplexity ($20/mo), and DeepSeek ($20/mo) in one extension — potential savings of $110+/mo. The For Everyone plan at $12/mo is a cheap entry point but lacks scheduled commands. Life plan at $240 one-time is only for single users and limited tokens. More expensive than ChatGPT Plus alone, but cheaper than subscribing to all models separately.
Setup time & first value
How long it actually takes to get something useful out of HARPA AI — broken out by persona, not the marketing-page minute.
Install the extension in seconds. For immediate value: press Alt + A on any page to summon HARPA. First summary or automation takes under 5 minutes. Scheduling commands or advanced automations: 10–20 minutes for initial setup of a workflow.
Switching to or from HARPA AI
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From ChatGPT standalone: install HARPA, connect your OpenAI account via Web Session or bring your own API key. All your ChatGPT use can be routed through HARPA for page context.
- →From Claude/Gemini apps: similar — bring your API keys or use built-in web sessions.
- →From other browser AI extensions: export any custom prompts if possible; HARPA's 100+ prompts cover most use cases.
- ↗To standalone ChatGPT/Claude: you can export chat history from HARPA (JSON), but prompts and automations are not directly portable.
- ↗To a single-LLM client: cancel HARPA subscription and continue with the individual model's web or desktop app. Lose page-aware automation.
Integrations
Resources & Guides
Official links
Tools that pair well with HARPA AI
Common stack mates teams adopt alongside HARPA AI, with the specific reason each pairing earns its keep.
Alternatives to HARPA AI
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