HARPA AI Review 2026: The Browser Agent That Actually Automates

HARPA AI is a browser extension that reads the page you are on and then does something useful with it. It answers questions about the page, watches it for changes you define, extracts its data into a table, and runs saved commands against it. The thing that separates it from cloud agents is where it runs: inside your browser, with your existing logins, so it reaches anything you can see without a single integration being built. We rate it 4.3 out of 5.

This review shows the two capabilities that justify it, with concrete walkthroughs, then covers the browser constraint that most reviews get wrong, the pricing unit that is easy to misread, and when a server-based tool is the better answer. Our best AI tools for productivity guide places it against the wider stack.

Worked example: how do you monitor a page for changes?

This is the capability that earns the subscription, so here is the shape of it rather than a feature claim.

• Open the page you care about. A competitor's pricing page, a product listing, a tender portal. If you need to be logged in, log in. That session is the point.
• Create a monitor and choose a condition. Not "tell me if anything changed", which produces noise, but a specific condition such as a price change, a text change in a named element, or availability.
• Set the check frequency. Every six hours suits a competitor price. Hourly suits stock that sells out. Matching the frequency to how fast the thing actually moves is most of the skill.
• Pick the action. Either a notification showing the difference in the page content, or a POST to a webhook so another system handles it.
• Let it run, then check it in a week. Monitors decay silently when a site is redesigned, so a monitor you have never re-read is a monitor you should not trust.

The webhook option is where this stops being a toy. Point it at an n8n webhook and the change lands in a Google Sheet and a Slack channel without anyone watching a browser tab. HARPA does the part that needs your login; the workflow tool does the part that needs reliability.

Worked example: how do you extract a table into a spreadsheet?

The second genuinely useful job, and the one people usually reach for first.

• Open the page holding the data. A directory listing, a search results page, a table buried in a report.
• Say which fields you want. Name them explicitly: company, city, price, rating. Vague instructions produce vague columns.
• Ask for a table, CSV or JSON. CSV for a spreadsheet, JSON if something downstream will parse it.
• Check the row count against the page. The most common failure is silent truncation on paginated or lazy-loading pages, where you get the first screenful and no warning.
• Spot-check three rows against the source. Column misalignment is easy to miss and poisons everything you do with the file afterwards.

Two honest limits. Anything behind infinite scroll or heavy JavaScript rendering is where extraction gets unreliable, and that is not specific to HARPA. And this is browser-based scraping, so the usual care applies: respect the terms of the sites you pull from, and do not treat a tool's convenience as permission.

Which browsers does it really work in?

Our own earlier description said Chrome-only, and that was wrong in a way worth correcting, because it rules the tool out for people it actually serves. The extension runs on Chromium, so Chrome, Edge, Brave, Opera and other Chromium-based browsers all work.

What genuinely does not work is Firefox and Safari. If you live in either, this is not your tool and no workaround fixes it. But "Chrome-only" as most reviews put it would exclude a large population of Edge and Brave users who are fine.

The deeper constraint is not the browser brand, it is that everything runs in a browser at all. Close the laptop and the monitors stop. That is the architectural trade, and it is the right one for some jobs and disqualifying for others.

What does it cost, and what is the trap?

Start with the unit, because it is easy to misread. Allowances are counted in Megatokens per year, not commands per month. That matters because a long page costs more to process than a short one, so your real capacity depends on what you point it at rather than how often you click.

Now the trap, and it is the most useful thing on this page. The lifetime plan is $240 once for roughly 30 Megatokens. S2 is roughly $228 a year for roughly 225 Megatokens. So the lifetime plan carries about one eighth of the annual plan's allowance. If those 30 Megatokens refresh every year, it is fair value for light use and pays back against S1 in about two years. If they are a single pool that never refills, $240 buys you a small, finite amount of work. The pricing page does not make this obvious, so get it confirmed in writing before you pay. A lifetime deal is only a deal if you know what it includes for life.

When is n8n or Manus the better answer?

We earn a commission on some of these, so the straight answer is that n8n is the stronger product and rates higher, and if your automation must run unattended it is not a close call: see our n8n versus HARPA comparison. Manus solves a different problem again, finishing an open-ended task rather than watching a page, which our Manus explainer covers in detail.

HARPA wins on one thing that neither can match: it is already logged in as you. For a page behind a corporate SSO, a portal with no API, or a site that blocks datacentre traffic, the browser extension reaches what a server cannot. That is a narrow advantage and a real one.

Who should not buy it?

• Firefox and Safari users. No workaround exists. Stop here.
• Anyone needing unattended automation. The loop runs only while your browser does, so overnight jobs belong on a server.
• People who will not learn the command system. It takes an afternoon, and without that investment you have an expensive page summariser.
• Teams wanting shared, auditable automation. Automations living in one employee's browser leave when they do.
• Anyone tempted by the lifetime plan on price alone. Compare allowances first, not headline figures.

The verdict: 4.3 out of 5

HARPA earns its score on a genuinely distinctive idea, executed well enough to rely on: most useful automation happens on pages you are already looking at, and being logged in as you is a capability no cloud agent can replicate. The monitoring is the part that will still be running in six months, and pairing it with a webhook rather than treating it as a rival to workflow tools is how it gets most valuable.

It loses marks for the browser ceiling, for a command system that asks for patience before it pays, and for pricing that is harder to read than it should be. Read our full HARPA AI review for the scoring, compare the cloud-agent approach in our Manus review, browse the field in our automation tool reviews, or install the free tier and set up one real monitor. One week of a working monitor tells you more than any review.

Frequently asked questions

What does HARPA AI actually do?+

It sits in your browser and acts on the current page. Three things matter in practice: it answers questions about the page you are reading without you pasting anything, it monitors a page and alerts you when something you specified changes, and it extracts structured data from a page into a table, CSV or JSON. There is also a library of over 100 ready-made commands for recurring jobs like SEO audits and reply drafting.

Is HARPA AI Chrome only?+

It is Chromium only, which is a less restrictive thing. The extension works in Chrome, Edge, Brave, Opera and other Chromium-based browsers. What it does not support is Firefox or Safari. Plenty of reviews describe it as Chrome-only, which wrongly rules it out for Edge and Brave users, so check which browser you actually use before dismissing it.

How much does HARPA AI cost?+

The free Demo tier gives 10 AI messages a day and 100 command runs in total, plus access to web monitors. Paid plans are about $12 a month for S1 (roughly 75 Megatokens a year) and about $19 a month for S2 (roughly 225 Megatokens a year), both billed annually. There is also a one-off lifetime plan at $240. Note the unit: allowances are measured in Megatokens per year, not in commands per month.

Is the HARPA AI lifetime plan worth it?+

Check the allowance before you decide, because that is where it turns. The $240 lifetime plan carries roughly 30 Megatokens against S2's roughly 225 a year for about $228. If those 30 Megatokens refresh every year it is reasonable value for light use. If they are a one-time pool it is a very small allowance for $240. The pricing page does not make this obvious, so confirm it in writing before paying.

HARPA AI or n8n for automation?+

They run in different places, which decides it. HARPA runs in your browser with your logged-in sessions, so it can reach anything you can see without building an integration. n8n runs on a server, so it keeps working when your laptop is closed and handles scheduled multi-step workflows properly. If the job is "watch this page I am logged into", choose HARPA. If it is "run this reliably at 3am forever", choose n8n. Many people use HARPA to detect the change and an n8n webhook to act on it.