HARPA AI vs Sider (2026): which should you pick?
As of Nov 13, 2026, Sider grades higher than HARPA AI: 3.0 against 2.2 out of 4.0.
Checked Nov 2, 2026 and Nov 13, 2026 · graded Nov 2, 2026 and Nov 13, 2026 by ToolGPA
Sider grades higher on features, ease of use and platforms. They get the same grade on value for money and the free plan.
Price, platforms and features side by side. The table says where each price was read and when.
HARPA AI
Browser extension that runs AI chat and automations on any page
Sider
AI sidebar for the browser with many models and mobile apps
Which one is for you
Pick HARPA AI if
- 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
Look elsewhere if
- 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
Pick Sider if
- Fits if you want an AI side panel on every browser tab
- Works for people who want several models to answer the same question in one chat
Look elsewhere if
- Not for you if you want to know what a plan includes before paying, as the store listings don't say
- Skip it if you'd buy the $49.99 Pocket Plan for desktop use, because its credits are for mobile only
- Pricey if you need Unlimited, at $39.99 a month, with Pro at $19.99 in between
- Watch out: the App Store also lists a legacy Basic plan, a $12.99 Nano plan, a $40.00 Plus plan and a second Pro item at $65.00 a month, none of them described
- Tight if you plan to stay free, since neither store listing says how much usage comes without a plan
How we grade them
| 2.2GPAHARPA AIFair | 3.0GPASiderVery good | |
|---|---|---|
| Value for money | CFor 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. | CBasic is $9.99 a month on the US App Store, which is ordinary money here, with Pro at $19.99 and Unlimited at $39.99. The listings don't say what any plan includes, and Sider's own site blocks automated readers, so web prices may differ. |
| Free plan and trial | CThe free Demo connects ChatGPT, Claude and Gemini through web sessions, with 10 messages a day and up to 100 command runs. | CThe apps and the browser extension are free to install, and the Chrome listing mentions free multi-chatbot support. Neither store listing says how much usage comes without a plan, so you'll meet the limit before you can read it. |
| Features | CPage-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. | BIt covers the job: a panel on any tab with GPT, Claude, Gemini, Grok and DeepSeek, or several at once in a group chat, questions about PDFs, pages and open tabs, YouTube videos boiled down, grammar and translation, and Wisebase for your files. Monica and Merlin do much the same. |
| Ease of use | CA browser extension where you connect web sessions or keys before it works. No store rating is on record. | A4.7 from about 4,300 App Store ratings. Install the extension and the panel is on every tab, so there's no copying between windows, and a Fusion model picks which AI handles each request. |
| Platforms and integrations | BA browser extension linked to ChatGPT, Claude, Gemini, OpenRouter, Azure, Make, Zapier and n8n. The site names Chrome, with notes for Brave and Edge. | AA sidebar for Chrome, Edge and Safari plus apps for Mac, Windows, iPhone and Android on one account, and it works inside Gmail, YouTube, Google and Bing. One catch: Sider says the mobile Pocket Plan's credits can't be spent in the desktop browser. |
| Best for | AI chat and page summaries inside Chrome | an AI side panel on every browser tab |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: HARPA AI and Sider. How we grade
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. Sider starts at $9.99 a month and scores 3.7.
Sider scores higher and starts $5.99 a month lower. Of the other AI assistants on the chart, 28 score higher than HARPA AI for less, and 2 score higher than Sider for less.
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
Where they differ
- HARPA AI also covers workflow automation.
- Sider also covers grammar & style.
At a glance
| HARPA AI | Sider | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | €14.3 per month, billed annually | $9.99 per month (Basic, US App Store); a mobile Pocket Plan is $49.99 per year |
| 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. | The iOS app is free to download and the Chrome extension lists free multi-chatbot support. Neither store listing says how much usage the free tier includes. |
| Free trial | None listed | None listed |
| macOS | ||
| Windows | ||
| iOS | ||
| Android | ||
| Browser extension | ||
| Made by | HARPA AI TECHNOLOGIES LLC | Vidline Inc. |
| Price read from | harpa.ai | apps.apple.com |
| Checked | Nov 13, 2026 | Nov 2, 2026 |
Worth knowing
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.
Sider
- Sider's website answers automated readers with a security check, so the prices here are US App Store in-app prices and web prices may differ.
- The store listings do not say how much usage the free tier includes or what each paid plan adds.
- Sider told an App Store reviewer that the Pocket Plan is for mobile use and that its credits cannot be spent in the desktop browser.
- The App Store also lists a legacy Basic plan, a $12.99 Nano plan, a $40.00 Plus plan and a $10 booster pack without describing them.
Key features
HARPA AI
- 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.
Sider
- Sidebar with many models
- The extension opens a side panel on any tab for chatting with GPT, Claude, Gemini, Grok, DeepSeek and other models. A Fusion model picks a model for each request automatically.
- AI group chat
- Put the same question to several models in one chat by @-mentioning them, then compare their answers as they arrive.
- Chat with files and pages
- Ask questions about PDFs, images, audio files, a web page or several open tabs. The mobile app accepts more than 30 file formats as well as images and URLs.
- Reading and video summaries
- Summarizes articles, web pages and PDFs, and condenses YouTube videos into highlights, with bilingual subtitles available while watching.
- Writing and translation
- Offers writing help in any input box, rewording and tone changes, a grammar checker, and translation of selected text, full pages, PDFs and images into 50+ languages.
- Wisebase and Sider Claw
- Wisebase is a knowledge base for uploaded files and saved websites. Claw, in the mobile app, takes a request and researches, compares, extracts and compiles the results.
Plans
HARPA AI
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.
Sider
Free$0
The apps and the browser extension are free to install. The store listings do not state how much usage is included without a plan.
Pocket Plan$49.99
per year (US App Store in-app purchase)
A plan for mobile use. Sider's reply to an App Store review says Pocket credits cannot be used in the desktop browser.
Basic$9.99
per month (US App Store in-app purchase)
Listed as Sider Basic Plan Monthly. The App Store listing does not describe what the plan includes.
Pro$19.99
per month (US App Store in-app purchase)
Listed as Sider Pro Plan Monthly. A second item with the same name is listed at $65.00 a month, and the listing does not describe either.
Unlimited$39.99
per month (US App Store in-app purchase)
Listed as Sider Unlimited Plan Monthly. A yearly price of $299.99 seen in October is no longer among the in-app purchases the listing shows.
Common questions
Which is cheaper, HARPA AI or Sider?
As of Nov 13, 2026, Sider is cheaper to start with: $9.99 a month, against about $15.98 a month for HARPA AI. HARPA AI starts at €14.3 per month, billed annually, and Sider starts at $9.99 per month (Basic, US App Store); a mobile Pocket Plan is $49.99 per year.
Which has a free plan, HARPA AI or Sider?
As of Nov 13, 2026, both HARPA AI and Sider have a free plan.
Which platforms do HARPA AI and Sider run on?
As of Nov 13, 2026, only Sider lists macOS, Windows, iOS and Android apps. Both list a browser extension. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.