HARPA AI

Where HARPA AI sits

HARPA AI is a Chrome extension that turns the browser sidebar into an AI assistant with hands. It connects to a list of cloud models — the pricing page currently names GPT-5.4, Claude Sonnet 4.6, Gemini 3.1 Pro, DeepSeek V3, Perplexity Pro, Grok 4.1 and Llama 4 — or to your own logged-in web sessions with ChatGPT, Claude and Gemini, and it can both talk about the page you are on and act on it: extract rows into a table, fill forms, watch a page for changes, run a saved command on a schedule. The acronym stands for High Availability Robotic Process Automation, per the vendor's own FAQ, and that framing is accurate: this is RPA shrunk into a browser tab, with an LLM where the brittle recorded steps used to be.

What makes it interesting against the wave of AI sidebar extensions is the automation half. Plenty of extensions will summarize the page you are reading. HARPA will also notice that the price dropped on the product page you asked it to watch, fire a webhook to Zapier or n8n, and run the whole thing without you touching the tab. It runs locally in the browser — the vendor states it does not store website data on its servers and is GDPR compliant — which matters to me for anything involving client dashboards or email.

Pricing is one of the more unusual structures in this category, so I will state it plainly: at time of writing, per harpa.ai/pricing, the DEMO tier is free with hard caps (10 web-session messages per day, 100 total AI command runs), the "for Everyone" plan is $12/month billed annually with 75 Megatokens per year, "for Pros" is $19/month billed annually with 225 Megatokens plus scheduled commands and advanced automation, and there is a $240 one-time "for Life" licence, single user, with 30 Megatokens and unlimited web-session connections. Token top-ups sell at $22.50 for 20 Megatokens. Annual billing adds 25% more tokens; team seats are discounted 10%.

What HARPA AI actually does

Trigger it with Alt+A or by typing "//" on any page and a sidebar opens with the current page loaded as context. From there the product splits into four overlapping jobs.

The first is page-aware assistance: summarizing articles, YouTube videos, PDFs and files, answering questions about the current tab, writing emails and social replies in a style it learns from your samples. The second is extraction and monitoring: pull structured rows out of a listing page, or arm a web monitor that checks a page on an interval and triggers actions when content changes — price drops, back-in-stock alerts, SERP movement. The third is reusable automation: 100+ predefined commands that you can fine-tune, plus your own custom commands, with scheduling and "advanced automation" gated to the $19 tier and above. The fourth is connectivity: CloudGPT (HARPA's own model connections, metered in Megatokens), web-session connections that ride your logged-in ChatGPT/Claude/Gemini accounts for free, or your own API keys — and outgoing webhooks to Zapier, Make and n8n for anything that should leave the browser.

The Megatoken meter deserves explanation because it confuses people. Output tokens cost 3x input tokens, and premium models like GPT-5.4, Sonnet and Gemini Pro burn more tokens per request than cheaper ones. HARPA's argument — stated on its pricing page — is that token billing is more transparent than query-count billing, since one extraction query can be fifty times the size of a chat message. In my usage that holds up, provided you actually look at the per-query token counter the extension shows you.

My testing notes

Four things I observed over a few weeks of daily use. First, the page monitors are the feature that keeps the extension installed. I armed a price monitor against a product listing and a change monitor against a documentation page; both fired reliably on change, and the scheduled command version of the same task (a "for Pros" feature) ran without the tab being open in my working set. This is the concrete gap between HARPA and a chat sidebar.

Second, extraction quality tracks the page, not the model. On clean, semantic HTML, a "extract all rows of this table into CSV" command gave me usable output on the first run. On infinite-scroll pages the built-in scroll options matter — you have to tell the command to scroll before extracting, or you get whatever rendered in the first viewport. Once I set that, the same command worked repeatedly.

Third, the connection types behave differently in ways the pricing page understates. Web-session connections are free but rate-limited and occasionally flaky when the underlying service changes its UI; CloudGPT was faster and did not break when I ran automation commands, which matches HARPA's own description of it as the reliable route. I ended up defaulting to CloudGPT for scheduled tasks and web sessions for casual chat.

Fourth, the free DEMO tier is genuinely usable for evaluation — 10 messages a day plus 100 command runs was enough to test monitors, extraction and commands before paying — but it is a demo, not a free plan. I hit both caps within two days of real use.

What it does not do

It is a browser extension and the browser is the boundary. There is no desktop control: HARPA cannot drive Excel, a native email client, or a desktop app, and multi-tab behavior only spans web pages. Chrome and Chromium browsers only — no Firefox or Safari build at time of writing. Its automation depends on the page being rendered; anything that requires heavy JavaScript execution can slow or confuse extraction, and sites that block extensions or use aggressive anti-bot walls can stop commands cold.

The plan gating is sharper than it first looks: scheduled commands and advanced automation are excluded from the $12 tier, so the automation-heavy use case really starts at $19/month billed annually. There are no refunds per third-party reviews of the checkout flow (billing runs through FastSpring), so use the DEMO tier first. The $240 lifetime plan looks like the bargain, but its 30 Megatokens is less than half the cheapest monthly plan's annual allowance — it only pays off if you plan to run on web sessions and your own API keys. And a one-person licence is exactly that; the vendor's page says single user only.

Finally, this is not a team analytics or governance product. Chat history syncs across devices on paid plans, but dialog content is not stored on HARPA's servers, so there is no admin console, no audit log, no SSO.

Verdict

For a solo researcher, marketer or operator who lives in Chrome, HARPA AI does a job that usually takes three tools: an AI sidebar, an extraction tool and a monitoring bot. I rate it 4.0 — core functionality depth 4.2 for the combination of extraction, monitors and scheduled commands, value 4.2 given the $12 entry point and the unusual lifetime option, usability 4.0 with a no-code command model that took me an afternoon to feel at home in, support and ecosystem 3.7 (public guides and a command library, but a small company behind it), and reliability 3.8 because web-session connections are inherently fragile and the product is closed-source. The buyer I have in mind is someone who automates research and monitoring workflows in a browser all day and does not want to write Playwright scripts to do it.

Sources

• https://harpa.ai
• https://harpa.ai/pricing
• https://harpa.ai/guides
• https://harpa.ai/privacy
• https://harpa.ai/library
• https://get.harpa.ai/
• https://prompt-architects.com/blog/692-harpa-ai-review-2026
• https://testedintelligence.com/harpa-ai
• https://toolscout.in/tools/harpa-ai.html
• https://aisotools.com/tool/harpa-ai