The HARPA AI Insider’s Guide
Everything we know about HARPA AI in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
HARPA AI
The Insider’s Guide
Browser extension that runs AI chat and automations on any page
Every plan, grade, refund rule and rival among AI assistants, read from HARPA AI’s own pages.
Made by HARPA AI TECHNOLOGIES LLC · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from HARPA AI’s own pages, its app-store listings and our grades. Every fact in it is on HARPA AI’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.2
GPA, above 15 of the 87 other AI assistants we grade
HARPA AI is a browser extension that puts chat models such as GPT, Claude, Gemini, DeepSeek and Perplexity on top of whatever page you have open. It summarizes pages, PDFs and YouTube videos, drafts text, monitors web pages and prices, and runs reusable AI commands. You can connect existing web sessions, bring your own API keys, or buy cloud tokens.
To get you started, here are 8 things to know about HARPA AI, taken from its own pages and our grades.
A browser extension where you connect web sessions or keys before it works.
- 1
Best for AI chat and page summaries inside Chrome
HARPA AI is a Chrome extension that puts chat models on top of the page you have open, summarizing pages, PDFs and YouTube videos and monitoring pages and prices.
- 2
Paid plans start at about $15.98 a month
As its pricing page puts it: €14.3 per month, billed annually.
- 3
There is a free plan
Free DEMO plan: ChatGPT, Claude and Gemini through web sessions, limited to 10 messages a day, and up to 100 AI command runs.
- 4
Page-aware AI chat
Opens on any web page with Alt + A and can use the page's content, search results and uploaded files in its answers.
- 5
Summaries of pages, PDFs and YouTube
Condenses long videos, articles and documents, and can answer questions about them and jump to timestamps in a video.
- 6
Commands and automation
Reusable AI commands, over 100 ready-made prompts, scheduled runs and advanced automation, with scheduling and automation on the S2 and lifetime plans.
- 7
A 2.2 GPA, above 15 of 87
That is against the other AI assistants we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
To replace HARPA AI you would be making an AI model, which you can rent by the request but not make. That is not a weekend's work, with an AI app builder or without one.
HARPA AI at a glance
- Pricing
- Free plan, from €14.3 per month, billed annually
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Browser extension
- Made by
- HARPA AI TECHNOLOGIES LLC
- Category
- AI Assistants
- Our grade
- 2.2 GPA, fair
The report card
Best for AI chat and page summaries inside Chrome
HARPA AI is a Chrome extension that puts chat models on top of the page you have open, summarizing pages, PDFs and YouTube videos and monitoring pages and prices. The free Demo is 10 messages a day, cloud use is metered in Megatokens, and the pricing page showed euros and says no refunds.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | For Everyone is €14.3 a month billed annually, between the category's middle of $12.42 and its dearer quarter at $18. For Life is €238 once. |
| Free plan and trial | C | The free Demo connects ChatGPT, Claude and Gemini through web sessions, with 10 messages a day and up to 100 command runs. |
| Features | C | Page-aware chat, summaries of pages, PDFs and YouTube, commands and monitors. Scheduling and advanced automation are on the dearer plan, and cloud use is metered. |
| Ease of use | C | A browser extension where you connect web sessions or keys before it works. No store rating is on record. |
| Platforms and integrations | B | A browser extension linked to ChatGPT, Claude, Gemini, OpenRouter, Azure, Make, Zapier and n8n. The site names Chrome, with notes for Brave and Edge. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who HARPA AI is for
- Fits if you want AI on whatever page you are reading, in Chrome
- Works for people who watch web pages or prices and want alerts
Who it is not for
- Skip it if you do not use Chrome, as the site names Chrome and only notes for Brave and Edge
- Tight if you stay free: 10 messages a day and 100 command runs
- Pricey if you use a lot of cloud models, as Megatokens are metered and output costs 3 times input
- Watch out: the pricing FAQ says there are no refunds, and euros showed when we read it from India
- Watch out: scheduled commands and advanced automation are on the dearer plan
Good to know
Good for
- People who want AI on top of whatever page they are reading
- Users who already pay for ChatGPT, Claude or Gemini and want to reuse those logins
- People who prefer a lifetime purchase to a subscription
Worth knowing
- The pricing page showed euro prices when read from India and no dollar price could be confirmed. The home page FAQ mentions a $12 starting price, so check at checkout.
- Cloud model use is metered in Megatokens: 1 Megatoken is 1 million input tokens, output tokens cost 3 times as much, and premium models use more.
- The pricing FAQ says there are no refunds or discounts, and a demo period is offered instead.
- It runs inside the browser. The site names Chrome and the Chrome Web Store, with troubleshooting notes for Brave and Edge.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
~$15.98
A month to start. There is a free plan too
HARPA AI has a free plan. Paid plans start at €14.3 per month, billed annually.
Demo
$0
Web session connections limited to 10 messages a day, up to 100 AI command runs, custom commands and web monitors.
For Everyone (S1)
€14.3
per month, billed annually; 75 Megatokens a year
Unlimited power messages, cloud models, PDF and YouTube summaries, chat history and web monitors. No scheduling or advanced automation.
For Pros (S2)
€19.6
per month, billed annually; 225 Megatokens a year
Everything in S1 plus scheduled commands, advanced automation, and a 10% discount on extra seats.
For Life (X)
€238
one-time, paid once, single user only
Lifetime access with 30 Megatokens. Use your own API keys or web sessions. Cloud tokens can be bought at a discount.
The free plan
Free DEMO plan: ChatGPT, Claude and Gemini through web sessions, limited to 10 messages a day, and up to 100 AI command runs.
Read from harpa.ai on Nov 13, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Browser extension
Browser extension that runs AI chat and automations on any page. Here is what it does, as its own site describes it, and what it covers: AI features, chat assistant, AI search, workflow automation, AI agents.
Page-aware chat, summaries of pages, PDFs and YouTube, commands and monitors.
- Page-aware AI chat
- Opens on any web page with Alt + A and can use the page's content, search results and uploaded files in its answers.
- Summaries of pages, PDFs and YouTube
- Condenses long videos, articles and documents, and can answer questions about them and jump to timestamps in a video.
- Commands and automation
- Reusable AI commands, over 100 ready-made prompts, scheduled runs and advanced automation, with scheduling and automation on the S2 and lifetime plans.
- Page and price monitors
- Watches a web page for changes or a product for price drops and back-in-stock alerts, and notifies you when something updates.
- Several ways to connect a model
- Connect ChatGPT, Claude or Gemini web sessions, use OpenRouter, Azure or other API keys, or draw on HARPA's cloud connection with a Megatoken balance.
Where it runs
- Browser extension
What it works with
- ChatGPT
- Claude
- Gemini
- OpenRouter
- Azure
- Make
- Zapier
- n8n
HARPA AI is made by HARPA AI TECHNOLOGIES LLC.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
15/87
Other AI assistants it is graded above
HARPA AI's GPA of 2.2 is higher than 15 of the 87 other AI assistants we grade, and level with 15.
It stands best on platforms and integrations (B, above 42 of 87) and worst on features (C, above 1).
Its paid plans start at about $15.98 a month, against a middle price of $12.46 for the category: 37 of the 53 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4. 28 tools score higher and cost less.
Each grade against the category
Every bar is all 88 AI assistants we grade, cut by the letter each got. HARPA AI’s own letter is outlined.
- CValue for moneyAbove 10 of 87
- CFree plan and trialAbove 12 of 87
- CFeaturesAbove 1 of 87
- CEase of useAbove 6 of 87
- BPlatforms and integrationsAbove 42 of 87
Price against what you get
Each dot is one of 65 AI assistants. Further left costs less; higher up scores better on features, ease of use and platforms. HARPA AI is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace HARPA AI you would be making an AI model, which you can rent by the request but not make. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 57 of the 87 other AI assistants grade higher. It costs $191.71 a year.
What you could not
- An AI model, which you can rent by the request but not make.
- An AI agent, with the models and the safeguards behind it.
- A search engine with an AI model behind it.
- Connections to other products, each kept working as those products change.
What this rests on. HARPA AI’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Monica, Sider, MaxAI, Merlin and ChatHub
The 5 tools HARPA AI is most often weighed against, with where each one differs from it.
- 3.2GPA
Monica
Free plan · from $8.3/mo
AI assistant with many models, built around a browser sidebar.
- Only Monica lists a web app.
- Only Monica lists macOS, Windows, iOS and Android apps.
- HARPA AI also covers workflow automation.
- 3.0GPA
Sider
Free plan · from $9.99/mo
AI sidebar for the browser with many models and mobile apps.
- Only Sider lists macOS, Windows, iOS and Android apps.
- HARPA AI also covers workflow automation.
- Sider also covers grammar & style.
- 2.6GPA
MaxAI
Free plan · from $12/mo
AI sidebar for Chromium browsers that chats about the page you are on.
- Only MaxAI lists a web app.
- HARPA AI also covers workflow automation and AI agents.
- MaxAI also covers citations, grammar & style and image generation.
- 2.8GPA
Merlin
Free plan
AI sidebar extension with models from several labs in one account.
- Only Merlin lists a web app.
- Only Merlin lists macOS, Windows, iOS and Android apps.
- HARPA AI also covers workflow automation.
- 2.6GPA
ChatHub
Free plan · from $14.99/mo
Ask several AI models one question and compare answers side by side.
- Only ChatHub lists a web app.
- Only ChatHub lists macOS, Windows, iOS and Android apps.
- HARPA AI also covers workflow automation and AI agents.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
11
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is HARPA AI free?
HARPA AI has a free plan. Free DEMO plan: ChatGPT, Claude and Gemini through web sessions, limited to 10 messages a day, and up to 100 AI command runs.
How much does HARPA AI cost?
HARPA AI lists 4 plans. Demo: $0.
Does HARPA AI have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. HARPA AI is listed for no platform we could confirm.
Does HARPA AI have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. HARPA AI is listed for no platform we could confirm.
Is HARPA AI open source?
HARPA AI is not described as open source on its own site, as read on Nov 13, 2026.
What does HARPA AI integrate with?
HARPA AI's listing names ChatGPT, Claude, Gemini, OpenRouter, Azure, Make, Zapier and n8n.
Who makes HARPA AI?
HARPA AI is made by HARPA AI TECHNOLOGIES LLC.
What are the alternatives to HARPA AI?
The closest alternatives to HARPA AI in our directory are Monica, Sider, MaxAI, Merlin and ChatHub.
How does HARPA AI compare with other AI assistants?
HARPA AI's GPA of 2.2 is higher than 15 of the 87 other AI assistants we grade, and level with 15.
Is HARPA AI good value for money?
ToolGPA grades HARPA AI C for value for money. Its paid plans start at about $15.98 a month, against a middle price of $12.46 for the category: 37 of the 53 others that charge start lower.
Could I make my own version of HARPA AI?
To replace HARPA AI you would be making an AI model, which you can rent by the request but not make.
Where this guide comes from
The prices, plans, platforms and features were read from HARPA AI’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from HARPA AI's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by HARPA AI TECHNOLOGIES LLC. Prices change, so check harpa.ai before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- HARPA AI, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/harpa-ai
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "HARPA AI: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/harpa-ai
Know someone choosing between AI assistants?
Send them this guide: toolgpa.com/tools/harpa-ai/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded AI assistants after HARPA AI, each with an Insider's Guide of its own.
- AI Assistants Insider's GuideEvery one of the 88 AI assistants we grade, compared
- Gemini Insider's GuideGoogle's AI assistant, tied into Gmail, Docs and other Google apps3.8 GPA
- Chatbox Insider's GuideAI chat client for your own API keys or a hosted model plan3.4 GPA
- ChatGPT Insider's GuideOpenAI's general-purpose AI assistant for chat, images and voice3.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what HARPA AI’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. HARPA AI is a trademark of its owner, and this guide is not made, paid for or approved by HARPA AI TECHNOLOGIES LLC. Prices and plans change: check harpa.ai before you buy.