The short answer
The best AI Chrome extensions by users are Grammarly (40M) and Anthropic's Claude (16M). By ratings, the standouts are Sider (4.92 from 114,491 ratings) and Monica (4.89). The official chatbot extensions have huge reach but ratings under 3 on 3 Oct 2026.
- We counted 4,411 extensions with an AI brand word in the name.
- 1,799 of them were first published in 2026.
- Only 109 had reached 100,000 users.
- Sider had more ratings than any other AI pick we checked.
The AI shelf of the Chrome Web Store looks like a gold rush. Lots of new stalls.
The best AI Chrome extensions are a short list, though. A few stalls have crowds, and most have one curious person poking at the sign before wandering back to the stall they already use every day.
How we counted
We searched names for AI, GPT, Claude, Gemini, Copilot and Perplexity. That catches most AI tools and misses some with plainer names, so treat 4,411 as a floor.
This is one of our Chrome extension market research guides, so every figure carries its date.
The best AI Chrome extensions by users
| Extension | Publisher | Users | Rating (count) |
|---|---|---|---|
| Grammarly | Grammarly | 40,000,000 | 4.49 (43,131) |
| Claude | Anthropic | 16,000,000 | 2.83 (1,710) |
| ChatGPT | OpenAI | 6,000,000 | 2.79 (819) |
| QuillBot | QuillBot (Course Hero) | 6,000,000 | 4.70 (5,970) |
| Sider | Vidline Inc. | 5,000,000 | 4.92 (114,491) |
| DeepL | DeepL | 4,000,000 | 4.72 (12,626) |
| Monica | Butterfly Effect | 3,000,000 | 4.89 (32,302) |
| LanguageTool | LanguageTooler | 2,000,000 | 4.66 (12,560) |
Reach versus fans
Here's the odd split. The official Claude and ChatGPT extensions have millions of users and ratings under 3.
Sider and Monica are sidebars that let you pick between several AI models. They have far fewer users but ratings near 4.9 from tens of thousands of people.
We can't read review text, so we can't tell you why. A common pattern on the store is that a brand-name tool gets installed by people expecting the full app, then rated down when the extension does less.
Writing helpers still lead
Grammarly was in the store long before chatbots, and it still has the most users of any AI-named tool. QuillBot and DeepL also rate above 4.6, and so does LanguageTool.
So the AI tools people keep tend to fix one task inside pages they already use. Writing and translating are the clearest cases, and students lean on them most: see the best Chrome extensions for students.
The 2026 crowd
As of 3 Oct 2026, 1,799 of the AI listings were first published in 2026.
Most are small, and a lot of them wrap the same few models in a sidebar with a new name, a new icon and a short list of shortcuts.
If you're building one, the question isn't whether the shelf is busy. It's whether your one task is done badly by everything already there. Our AI extension market research guide shows how to check.
Where Ext Watch fits
We're biased, being the makers. Ext Watch lets you filter by words in the name and shows the day each number was seen. The extension directory is where we built this list.
Before installing the next AI sidebar, name the one task it should do. Then test only that.
Questions people ask
What is the most popular AI Chrome extension?
Grammarly, with 40M users on 3 Oct 2026. Among chatbots, Anthropic's Claude extension had 16M.
What is the best rated AI extension?
Among large ones in our crawl, Sider rated 4.92 from 114,491 ratings.
Are AI Chrome extensions safe to use?
They often read page content, so check permissions and the publisher. Prefer tools from companies you can identify.
Where these numbers come from
- chromewebstore.google.comChrome Web StoreAccessed 3 Oct 2026
Part of our guide: Chrome Extension Market Research: A Step-by-Step Method. More in Market research.
4,581 extensions tracked in AI assistants. See them all.
Users, ratings and new launches per niche, from our own crawl. Updated 3 Oct 2026 from our Chrome Web Store crawl
