Alternatives · AI Assistants
HARPA AI alternatives
As of Nov 13, 2026, the highest-graded HARPA AI alternative is Monica (3.2 GPA). It's also the best free one.
HARPA AI compared with 6 alternatives: Monica, Sider, MaxAI, Merlin, ChatHub and 1 more.
HARPA AI has a free plan. Paid plans start at €14.3 per month, billed annually. All 6 alternatives are free or have a free plan.
Listings checked up to Nov 13, 2026 · Where the facts come from
Black Friday: is there a HARPA AI sale?
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| HARPA AIThis tool | Free plan · from €14.3/mo | Yes | Browser extension |
| Monica | Free plan · from $8.3/mo | Yes | Web, macOS, Windows, iOS, Android, Browser extension |
| Sider | Free plan · from $9.99/mo | Yes | macOS, Windows, iOS, Android, Browser extension |
| MaxAI | Free plan · from $12/mo | Yes | Web, Browser extension |
| Merlin | Free plan | Yes | Web, macOS, Windows, iOS, Android, Browser extension |
| ChatHub | Free plan · from $14.99/mo | Yes | Web, macOS, Windows, iOS, Android, Browser extension |
| Glarity | Free plan · from $7.49/mo | Yes | Browser extension |
Price against what you get
HARPA AI starts at about $15.98 a month and scores 2.3 out of 4 on features, ease of use and platforms. 4 of the 5 alternatives on this chart score higher and start lower: Monica, Sider, MaxAI and ChatHub.
Glarity starts lower without scoring higher.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
How each one differs from HARPA AI
Monica
AI assistant with many models, built around a browser sidebar
- Monica starts at $8.3 per month, billed annually ($99 per year).
- Monica also lists a web app and macOS, Windows, iOS and Android apps.
- Monica also covers grammar & style.
- Monica does not cover workflow automation, which HARPA AI does.
Suits: People who want AI help inside the browser on any web page
Sider
AI sidebar for the browser with many models and mobile apps
- Sider starts at $9.99 per month (Basic, US App Store); a mobile Pocket Plan is $49.99 per year.
- Sider also lists macOS, Windows, iOS and Android apps.
- Sider also covers grammar & style.
- Sider does not cover workflow automation, which HARPA AI does.
Suits: People who want an AI side panel on every browser tab
MaxAI
AI sidebar for Chromium browsers that chats about the page you are on
- MaxAI starts at $12 per member / month, billed yearly ($30 billed monthly).
- MaxAI also lists a web app.
- MaxAI also covers citations, grammar & style and image generation.
- MaxAI does not cover workflow automation and AI agents, which HARPA AI does.
Suits: People who read, write and research inside a Chromium browser all day
Merlin
AI sidebar extension with models from several labs in one account
- Merlin also lists a web app and macOS, Windows, iOS and Android apps.
- Merlin does not cover workflow automation, which HARPA AI does.
Suits: People who want an AI sidebar on any website
ChatHub
Ask several AI models one question and compare answers side by side
- ChatHub starts at $14.99 per month, billed annually ($19 billed monthly).
- ChatHub also lists a web app and macOS, Windows, iOS and Android apps.
- ChatHub does not cover workflow automation and AI agents, which HARPA AI does.
Suits: Comparing how several AI models answer the same prompt
Glarity
Browser extension that summarizes pages and videos and translates
- Glarity starts at $7.49 per month, billed every 12 months ($89).
- Glarity is open source, according to its own site.
- Glarity also covers transcription.
- Glarity does not cover workflow automation and AI agents, which HARPA AI does.
Suits: People who want video, article and PDF summaries inside the browser
Limits worth knowing in HARPA AI
- 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.
Common questions
What are the alternatives to HARPA AI?
The alternatives to HARPA AI in this directory are Monica, Sider, MaxAI, Merlin, ChatHub and Glarity. Each one has a side-by-side comparison with HARPA AI.
Is there a free alternative to HARPA AI?
Yes. Monica, Sider, MaxAI, Merlin, ChatHub and Glarity have a free plan alongside paid ones.
Which HARPA AI alternatives work on Windows?
The HARPA AI listing does not include a Windows app. Monica, Sider, Merlin and ChatHub list one.
Which HARPA AI alternatives work on macOS?
The HARPA AI listing does not include a macOS app. Monica, Sider, Merlin and ChatHub list one.
Is there an open-source alternative to HARPA AI?
Glarity is described as open source on its own site.
When were these prices checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices without notice, so confirm on their site before you buy.
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