Best AI Extensions for Chrome in 2026, Picked by Use Case

Most "best AI Chrome extensions" articles list 15 to 20 tools without explaining why you'd choose one over another. We narrowed the field with three filters.

First, the extension had to solve a specific problem better than a general chatbot tab. If you can get the same result by pasting text into ChatGPT, the extension isn't earning its install.

Second, we checked permissions. An Incogni study from January 2026 found that 52% of AI Chrome extensions collect user data, and 29% collect personally identifiable information. About 42% request scripting permissions that let them capture keystrokes or modify page content. We flagged extensions that request broad permissions so you can make an informed call.

Third, the extension needed a usable free tier or trial. Paid-only tools with no way to test before committing didn't make the cut.

Here's what we settled on, organized by the job each extension does best.

Helpful references: Fast.io Workspaces, Fast.io Collaboration, and Fast.io AI.

Perplexity's Chrome extension puts a citation-backed research assistant in your browser sidebar. Highlight text on any page, right-click, and get an answer grounded in web sources. It also summarizes full pages, PDFs, and articles with one click.

What sets it apart from chatbot extensions is source transparency. Every answer includes numbered citations you can click to verify. For fact-checking claims while reading an article or pulling together background research, it saves the copy-paste-search loop that eats hours.

Best for: Researchers, analysts, and anyone who needs sourced answers without leaving the page they're reading.

Free tier: Generous daily query limit on the free plan. Perplexity Pro ($20/month) unlocks GPT-4o and Claude access for deeper research.

Privacy note: Perplexity reads page content when you invoke it. It processes queries through cloud servers, so your highlighted text and page context leave the browser. The extension doesn't request background scripting permissions, which means it only activates when you trigger it.

Grammarly remains the most widely installed writing extension on Chrome, and for good reason. It catches grammar and spelling errors in real time across email clients, Google Docs, social media, and nearly any text field on the web. The AI layer adds tone detection, rewriting suggestions, and the ability to flag passive-aggressive phrasing in workplace messages.

The free tier handles core grammar, spelling, and punctuation. Paid plans add full-sentence rewrites, tone adjustments, and plagiarism detection.

Best for: Anyone writing emails, documents, or posts in Chrome who wants inline corrections without switching tools.

Free tier: Core grammar and spelling checks are free with no daily limits.

Privacy note: Grammarly is one of the most privacy-invasive popular extensions. The Incogni 2026 study flagged it for collecting personal communications, location data, and browsing activity. It requires scripting and ActiveTab permissions to work, meaning it can read and modify text on every page you visit. Grammarly's privacy policy states they process text to provide suggestions, but the breadth of data collection goes beyond what many users expect. If you handle sensitive documents, consider disabling it on specific sites.

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Sider AI gives you a persistent sidebar with access to GPT-4o, Claude, Gemini, and over 20 other models from a single extension. Select text on any page and a popup offers to explain, translate, summarize, or rewrite it. The sidebar stays open while you browse, so you can carry a conversation across multiple tabs.

The Group AI Chat feature lets you ask one question and see responses from multiple models side by side. That's useful for comparing how different models handle a coding question or interpret ambiguous text.

Sider also includes Wisebase, a knowledge base that stores your research across sessions. It earned over 40,000 five-star ratings on the Chrome Web Store, making it one of the highest-rated AI extensions available.

Best for: Power users who want multi-model access in one place instead of maintaining separate subscriptions.

Pricing: Free plan with 30 daily credits. Paid plans run $4.20 to $16.70/month depending on usage.

Privacy note: Sider processes queries through whichever AI model you select, so your text leaves the browser. The extension requests standard sidebar permissions but doesn't require background scripting.

HARPA AI goes beyond chat. It combines an AI assistant with web automation, letting you set up page monitors, extract structured data, track competitor pricing, and automate repetitive browser tasks. It works alongside ChatGPT, Claude, Gemini, and other models, and offers over 100 built-in commands for common workflows.

The standout feature is website monitoring. Tell HARPA to watch a page for changes on a schedule and it will notify you when something updates, then optionally generate an AI summary of what changed. That's practical for tracking job postings, pricing pages, or competitor product updates.

With over 400,000 users, HARPA has built a reputation for being more privacy-conscious than most AI extensions. It claims to store no user data and only reads page content when you explicitly invoke a command. That said, prompts and page content still get sent to whichever third-party model provider you select.

Best for: Marketers, sales teams, and analysts who need structured data extraction and page monitoring alongside AI chat.

Free tier: Free for basic AI chat and automation. Paid plans unlock higher usage limits and premium model access.

Privacy note: HARPA claims privacy requirements and no server-side data storage. Page content is only read when you trigger a command. However, data does flow to third-party AI providers (OpenAI, Anthropic, Google) when you run queries.

Before installing a third-party summarizer, check what Chrome already provides. Google has been quietly integrating Gemini Nano directly into the browser since late 2024. As of 2026, Chrome includes on-device AI features for page summarization, "Help me write" text generation, smart tab grouping, and scam detection.

The on-device approach means some features work without sending data to Google's servers. Gemini Nano runs locally using a roughly 4 GB model that Chrome downloads in the background. In May 2026, Google faced criticism for installing this model without clear user consent, though they've since added a toggle in Chrome settings to disable and remove it.

For basic summarization and writing help, Chrome's built-in tools are surprisingly capable and eliminate the need for a separate extension. The trade-off is that on-device models are less powerful than cloud-based options like GPT-4o or Claude. Complex questions or nuanced summarization still benefit from dedicated extensions.

Best for: Users who want basic summarization without installing another extension or sending data to third parties.

Free tier: Included with Chrome at no cost.

Privacy note: On-device processing keeps data local for supported features. However, Chrome's broader Gemini integration also includes cloud-based features in the side panel that do send data to Google. Check your Chrome AI settings (chrome://settings/) to control what runs locally versus in the cloud.

The Incogni 2026 privacy study analyzed 442 AI-powered Chrome extensions downloaded a combined 115.5 million times. The findings are worth reviewing before you install anything.

52% of AI extensions collect at least one type of user data. 29% collect personally identifiable information like names, email addresses, and IP addresses. The most commonly collected data category is website content (31.4%), followed by PII (29.2%).

Permissions are the bigger concern. 75% of all browser extensions request high or critical permission levels, meaning they have broad access to data flowing through your browser. AI extensions are nearly six times more likely to change or expand their permissions after installation compared to the average extension.

The riskiest categories, ranked by privacy impact: programming aids, meeting transcription tools, and writing assistants collect the most data. Translators and audiovisual generators tend to collect the least.

Practical steps to reduce risk:

• Check permissions before installing. If a summarizer wants access to "all your data on all websites," look for an alternative
• Use extension-specific site controls. Chrome lets you restrict which sites an extension can access
• Review extensions quarterly. Remove anything you're not actively using
• For sensitive work, consider browser profiles. Keep a clean profile with no AI extensions for banking, healthcare portals, and confidential documents

If your team handles files that shouldn't pass through third-party AI providers, a workspace with controlled access makes more sense than browser extensions that route data through external servers. Fast.io workspaces keep files indexed and searchable with built-in Intelligence Mode, and the AI processing stays within the platform rather than going through extension permissions you can't fully audit. The free plan includes 50 GB of storage and 5,000 monthly AI credits with no credit card required.