8 Best AI Browser Extensions for Chrome in 2026

The best AI browser extensions in 2026 are Yantra Sidecar, ChatGPT for Chrome and Claude in Chrome if you want an assistant that can act on the page, Gemini in Chrome if you want one built in, and HARPA AI, MaxAI, Monica and Grammarly for lighter reading, writing and automation help. The useful ones now do more than summarize a page. They read the tabs you allow, fill in forms, and stop before anything is posted or paid.

We compared eight Chrome AI extensions on what they can do on a page, how much of your browser they can see, which browsers they support, and what they cost.

Key takeaways

• There are two kinds of AI extension now. Sidebar assistants read and write. Agent extensions also click, type and navigate in your tabs. Decide which you need before you compare features.
• Tab access is the privacy setting that matters. The best extensions let you choose between one tab, the tab you are looking at, or every tab.
• Your logins are the agent's superpower. An extension works on sites where you are already signed in, which a cloud agent cannot always do.
• Watch for a publishing rule. An extension that drafts a post and waits is safer than one that posts on its own.

Quick comparison

Prices checked November 2026.

What is an AI browser extension?

An AI browser extension adds an assistant to the browser you already use. The simplest ones open a sidebar where you can ask about the current page, summarize it or rewrite text. The newer ones are agents: they can navigate to a URL, click buttons, type into fields and pull data out of tables, using the logins already in your browser.

Because the extension sits inside your browser, the question is not only "what can it do" but "what can it see". Check how it decides which tabs it reads, and whether it can act without asking.

1. Yantra Sidecar: best full assistant in the side panel

Sidecar is the Yantra chat in Chrome's side panel, installed with the Yantra browser extension. Each tab gets its own conversation, restored when you come back, even after a browser restart. The model menu offers Yantra Haiku, Yantra Sonnet and Yantra Opus 5.5, dictation goes into the draft before sending, and output chips switch a reply to a Mindmap, a Mermaid diagram or an Artifacts page.

Access is explicit. Settings open on Access with three choices: Only tabs I pick, The tab I'm looking at or Every tab in this window. The Connection switch Let Yantra use this browser decides whether the agent may open, read or click anything at all.

The part most extensions lack is Record a task. Press Record this tab, do the task once, then Stop recording, name it and Create skill. Each of your Recorded tasks gets Run in my tab, with a short form prefilled from what you did. Passwords and card numbers are never recorded. Site helpers cover Gmail, Google Calendar, Google Docs, Google Sheets, LinkedIn, Notion and Slack, and Check prices while I shop looks for the same item for less on Amazon, Walmart, Best Buy, Target and eBay. The Sidecar walkthrough covers every setting.

Pros

• One conversation per tab, three access levels and a clear on and off switch for browser control
• Recorded tasks you can run again in one click
• Site helpers, highlight-to-ask and price checks while you shop
• The same assistant you use on the web, desktop and messaging apps

Cons

• Chrome and Chromium-based browsers only, so no Safari or Firefox
• The agent stops at Post, Send and Delete unless you say to publish, which is safer but means one more message
• Card fields inside payment iframes such as Stripe Elements cannot be filled during checkout

Pricing: Included in Yantra plans. See Plans overview.

2. ChatGPT for Chrome: best for existing ChatGPT users

The ChatGPT Chrome extension puts ChatGPT in Chrome's sidebar with access to your chat history. In chat it can review your open tabs, for example to compare three products by price and delivery time. With ChatGPT Work, OpenAI's agent for multi-step tasks, it can take control of tabs to fill out forms, send messages and organize tabs. It also works in Edge, Brave and Opera.

Pros: strong models, tab comparison, available on any ChatGPT plan. Cons: acting in tabs depends on ChatGPT Work, which has rolled out plan by plan. Pricing: free to install; Plus ~$20/mo.

3. Claude in Chrome: best careful agent in your signed-in browser

Claude in Chrome clicks, types and navigates websites where you are signed in, and you choose whether it asks before acting. It can finish a task in the background while you do something else, and skills you save in the panel run from other Claude surfaces too.

Pros: cautious by design, strong at reading long pages. Cons: paid plans only, and Chrome only. Pricing: on all paid Claude plans, Pro $20/mo ($17/mo billed yearly).

4. Gemini in Chrome: best built-in option

Gemini in Chrome is not an extension at all: it is built into Chrome on desktop and iPhone. It answers questions across your open tabs, summarizes pages and YouTube videos, works with Google Calendar, edits images in a tab and saves reusable prompts as Skills. Auto browse completes multi-step tasks on websites.

Pros: nothing to install, tight Google integration. Cons: auto browse is only for AI Pro and Ultra subscribers in the US, and it is not on Android yet. Pricing: free to use; auto browse with Google AI Pro ~$20/mo.

5. HARPA AI: best for monitoring and custom automations

HARPA AI is the power user's extension. It ships with more than 100 preconfigured commands, lets you write your own, and can navigate websites, click buttons, fill forms and extract data. Page and price monitoring alert you when a site changes, and the Pros plan adds scheduled commands. You can connect it to ChatGPT, Claude or Gemini through a web session or your own API keys.

Pros: real automation and monitoring, bring-your-own keys, a one-time lifetime option. Cons: a steeper learning curve, and the free demo is very limited. Pricing: from ~$12/mo billed yearly; ~$19/mo billed yearly for scheduled commands and advanced automation.

6. MaxAI: best for reading, translating and replying

MaxAI adds an AI sidebar with several top models in one place. It translates selected text or whole pages side by side, rewrites and polishes your writing, drafts replies in Gmail, Outlook and LinkedIn, and summarizes web pages, YouTube videos and PDFs. One-click custom prompts save repeated work.

Pros: broad everyday toolkit, usable free tier. Cons: it reads and writes but does not act on pages. Pricing: free; Pro ~$12/mo billed yearly or ~$30 month to month.

7. Monica: best for many models in one sidebar

Monica gives you a sidebar on any web page with access to several leading models. It suits people who want to switch models without switching tabs.

Pros: model variety, quick start. Cons: a daily usage cap on the free plan, and no page actions. Pricing: free to start; paid plans for higher limits.

8. Grammarly: best for writing quality

Grammarly is the extension most people already have. It corrects grammar and commonly confused words wherever you type and can draft replies and rewrites with generative AI. It is also the only tool here that supports Safari and Firefox.

Pros: works in almost every text box, widest browser support. Cons: a writing tool, not an assistant that can act. Pricing: free with 100 AI prompts a month; Pro ~$12/mo.

How to choose an AI browser extension

• You want an assistant that acts in your tabs and remembers recorded tasks: Yantra Sidecar.
• You already pay for ChatGPT or Claude: start with their own extension.
• You do not want to install anything: Gemini in Chrome.
• You want monitoring and custom automations: HARPA AI.
• You mostly read, translate and reply: MaxAI or Monica.
• You only want better writing: Grammarly.

Install no more than two at once. Several sidebars fighting over the same page slow Chrome down and make it hard to know which one read what. If prices are your main use case, our best price tracking tools guide goes deeper, and the best AI email assistants covers inbox work.

FAQ

What is the best AI extension for Chrome?

For an assistant that can read and act in your tabs, Yantra Sidecar, ChatGPT for Chrome and Claude in Chrome are the strongest picks. For writing help alone, Grammarly is hard to beat. The best one depends on whether you need an agent or just a sidebar.

Are AI browser extensions safe?

They can be, if you control what they see. Choose an extension with explicit tab access settings, share only the tabs a task needs, and keep sends, posts and payments behind your approval. Yantra explains its permissions and what it never collects in Extension Security and Privacy.

Can an AI extension fill out forms for me?

Yes. Sidecar, Claude in Chrome, HARPA AI and ChatGPT for Chrome with ChatGPT Work can fill forms in your tabs. Unusual widgets such as custom date pickers and payment iframes may still need you.

Is there a free AI browser extension?

Yes. Sidecar comes with a free Yantra account, and ChatGPT for Chrome, MaxAI, Monica and Grammarly all have free plans. Claude in Chrome needs a paid Claude plan.

Do AI browser extensions work in Edge, Brave or Safari?

Most are Chromium extensions, so they also run in Edge and often Brave. Grammarly is the only one on this list that supports Safari and Firefox.

What is the difference between an AI extension and an AI browser?

An extension adds AI to the browser you already use, with your bookmarks, logins and other extensions intact. An AI browser such as Perplexity Comet replaces your browser. See our best AI browser agents for that category.

The verdict

Sidebar extensions that summarize and rewrite are now a commodity, and MaxAI, Monica and Grammarly do that job well. The bigger shift is extensions that act: ChatGPT for Chrome and Claude in Chrome are strong if you already pay for them. If you want one assistant in the side panel with per-tab chats, explicit access controls, site helpers and tasks you record once and run again, install Yantra Sidecar.