Best AI Chrome Extensions

Claude in Chrome is the most capable AI extension you can install today. It opens in a side panel and can read the page, click, type, fill in forms, work across several tabs and run tasks on a schedule. It also uses the skills and connectors from your main Claude account. Anthropic tested it with a small pilot in August 2025, widened it to all paid plans in December 2025 and declared it generally available on 26 August 2026.

It costs at least $20 a month because it needs a paid Claude plan. Its store rating is low (2.8 out of 5 from about 1,700 reviews), so expect some rough edges; the extension is still updated often. Like every agent, it can be targeted by prompt injection, so Anthropic lets you limit which sites it may act on.

Pick it if you already pay for Claude and have repetitive web chores. Skip it if you only want free summaries or use Edge, Brave or a phone.

Grammarly is the most trusted AI extension by sheer numbers: 40 million Chrome users and a 4.5-star rating from over 43,000 reviews. It checks spelling, grammar and tone as you type in Gmail, Google Docs, LinkedIn and most other sites, and Pro adds full-sentence rewrites, plagiarism checks and an AI-text detector.

The parent company renamed itself Superhuman in October 2025 and added Superhuman Go, a set of agents that can pull information from other apps into the extension. That is useful, but Grammarly's core strength is still polishing your own writing, not browsing for you.

It needs to read everything you type, including private emails. The company says it does not sell this data, but you should turn it off on sensitive sites.

Pick it if you write a lot in the browser. Skip it if you want a chatbot that researches or acts on pages.

This is OpenAI's official extension, and it replaced much of what the Atlas browser did before Atlas shut down on 9 August 2026. It adds a ChatGPT sidebar that can see the page you are on. You can ask about it, summarise it, translate it or start a task, and it works with a free ChatGPT account.

It is an assistant layer, not a full agent. Long, multi-step jobs are handed to the ChatGPT desktop app. The rollout has also been uneven across plans and countries. The biggest practical risk is fakes: the Chrome Web Store is full of unofficial "ChatGPT" extensions, so check that the publisher is OpenAI before installing.

Pick it if you use ChatGPT and want it on every page for free. Skip it if you need an agent that completes tasks inside Chrome itself; Claude in Chrome does more.

Glasp is a highlighter first and an AI tool second, and that is its strength. You highlight passages on web pages, PDFs and YouTube transcripts, and Glasp saves them to one searchable library. It can summarise articles and videos using ChatGPT, Claude or Gemini, and export your notes with links into apps like Notion or Obsidian.

It will not write emails or do tasks for you. Glasp is also a social reading network, so check your sharing settings if your reading is private.

Pick it if you are a student or researcher who wants to keep what you read. Skip it if you want a general chatbot or an agent.

Sider packs the most features into one sidebar. It lets you chat with several AI models side by side, run a deep-research agent that scans many sources, translate pages and PDFs, and save findings in a searchable knowledge base called Wisebase. Paid plans are credit-based and cheaper than a single chatbot subscription.

Privacy is the problem. The 2025 USENIX Security study by UCL and partners found Sider shared users' questions and identifying data such as IP addresses with Google Analytics, and kept recording activity in private browsing. That does not mean Sider is malicious, but it is a real reason to keep it off sensitive sites.

Pick it if you want to compare AI models cheaply on public web content. Skip it if you use the browser for health, banking or work systems.

Monica has one of the highest ratings in the Chrome Web Store (4.9 from about 32,000 reviews). It bundles chat with several models, page and YouTube summaries, PDF translation, image and video generation, and a browser agent for repetitive tasks. It comes from Butterfly Effect, the same company that makes the Manus agent.

The USENIX Security 2025 study found Monica among the extensions that built profiles of users and personalised answers across sessions. The listing also advertises an "AI-bypass" rewriting tool, meant to beat AI detectors, which may break school or workplace rules.

Pick it if you want many AI tools in one extension and use it on non-sensitive sites. Skip it if privacy matters to you or you need a simple, focused assistant.

Merlin sells access to many top models (GPT-5.2, Claude Opus 4.6, Gemini 3 and others) through one $19 monthly plan and one sidebar. It summarises pages and videos, drafts replies and runs web searches. On paper that is good value compared with paying for several chatbots.

In practice there are two problems. First, the "unlimited" Pro plan has a hidden fair-use cap; users report it stops at roughly $100 of model usage a month. Second, and more serious, the 2025 USENIX Security study found Merlin capturing form inputs such as banking and health data, including a Social Security number typed into an IRS form, and continuing to record in private browsing.

Pick it if you only use it on public pages and want many models cheaply. Skip it if you ever type personal or financial data in the same browser.