The Best Free Chrome Extensions for Claude.ai (2026)

Claude.ai is one of the best AI assistants available, but its interface stays deliberately minimal. No usage meter. No conversation branching. No prompt library. No token counter. For casual use that's fine — for daily power users it's genuine friction.

A small number of Chrome extensions fill these gaps. This list covers the best options in 2026, split into two categories: tools built specifically for Claude.ai, and general AI sidebar extensions that happen to support Claude as one of many models.

Before You Install: What to Look For

A Claude.ai extension runs inside claude.ai, which means it has potential access to your conversations. Before installing anything, check three things:

• Permissions requested — does it ask for access to all websites, or just claude.ai?
• Data handling — does it send your conversations or usage data to external servers?
• Maintenance — Claude.ai updates regularly; an abandoned extension will break

This list only includes extensions with clear, verifiable privacy practices.

The Best Extensions for Claude.ai in 2026

1. ClaudeKit — Best Overall for Claude.ai Power Users

Free · Claude-specific · No account required

ClaudeKitis the only extension built exclusively for Claude.ai. It addresses the most common frustrations with Claude's native interface head-on:

• Live usage badge — shows your session and weekly usage percentage on every Claude.ai page. Reads from Claude's own /usage API. No more getting cut off without warning. (Full guide →)
• Conversation forking — adds a fork button to every message. Click to open a new Claude tab with full conversation context, so you can try a different approach without losing your thread. (Full guide →)
• Prompt library — save prompts locally, tag by category, insert with / in the chat input. (Full guide →)
• Live token counter — word count and token estimate as you type, plus token counts on Claude's responses
• Right-click integration — highlight text on any webpage and send it to Claude directly
• Export conversations — download any conversation as Markdown, JSON, or plain text
• 30-day usage history — local chart of your usage patterns

Privacy: Requests exactly four permissions — storage, notifications, contextMenus, and access to claude.ai. No access to other websites. All data stored locally. No analytics, no tracking, no account.

Best for:Claude Pro and Max users who use Claude daily for work and want visibility and control that Claude's interface doesn't provide.

2. Merlin — Best General AI Sidebar with Claude Support

Freemium · Multi-model · Requires API key or subscription

Merlin is one of the most popular AI browser extensions, with millions of users. It adds a sidebar accessible on any webpage where you can query multiple AI models — including Claude — without navigating away from what you're reading.

• Works on any website, not just claude.ai
• Supports Claude, GPT-4, Gemini, and others from a single interface
• Useful for reading comprehension, summarisation, and quick queries while browsing

Important distinction:Merlin connects to Claude via the Anthropic API using your own API key (you pay per token) or through Merlin's own subscription, which routes queries through their servers. This is fundamentally different from ClaudeKit, which enhances your existing claude.ai subscription without sending data anywhere.

Best for: Users who want to use Claude (or other AI models) while browsing the web, not specifically for power-using claude.ai itself.

3. Monica AI — Best for Multi-Model Workflows

Freemium · Multi-model · Requires subscription for full access

Monica is a comprehensive AI assistant sidebar that supports Claude alongside GPT-4, Gemini, and others. It offers a wider feature set than Merlin, including document summarisation, image analysis, and writing assistance across browsers.

• Full sidebar with history and conversation management
• Supports Claude as one of several model options
• Screenshot and PDF analysis
• Writing assistance across any text field

Best for:Users who want a polished AI assistant that works everywhere in the browser and aren't strictly Claude-first.

4. Sider AI — Best for Research and Reading

Freemium · Multi-model · Reading-focused

Sider positions itself as a research assistant. Its strengths are reading comprehension, web page summarisation, and helping you process content quickly. It supports multiple AI backends including Claude.

• Floating sidebar that stays open as you browse
• Page summarisation and highlighting with AI explanation
• Chat with the content of any web page

Best for:Researchers and readers who primarily want AI to help them process content they're already reading online.

5. MaxAI — Best for Writing Assistance

Freemium · Multi-model · Writing-focused

MaxAI focuses on writing assistance — rewriting, improving, and editing text anywhere in the browser. It supports multiple AI models and integrates into text fields across websites.

• One-click rewriting and improvement suggestions
• Works inside Gmail, LinkedIn, Twitter/X, and most text fields
• Tone and style controls

Best for: Writers and marketers who want AI writing assistance integrated everywhere in the browser.

6. Wiseone — Best for Article Reading Comprehension

Freemium · Multi-model · Niche but excellent

Wiseone is a focused tool for understanding complex articles. It highlights key concepts, provides instant definitions, and lets you ask questions about the article you're reading — powered by AI including Claude in some configurations.

Best for: Anyone who reads a lot of dense content (research papers, technical articles, long-form journalism) and wants AI-assisted comprehension.

Feature Comparison

Claude-Specific vs. General AI Sidebars: The Core Difference

This distinction matters more than it might seem at first.

Claude-specific tools (ClaudeKit) enhance your existing claude.ai subscription. They read data Claude already exposes, add features to the claude.ai interface, and store everything locally. Your Claude.ai subscription does all the AI work — the extension just adds UI and tooling around it.

General AI sidebars (Merlin, Monica, Sider, MaxAI) connect to Claude via the Anthropic API separately from your claude.ai subscription. This means:

• You typically pay separately (API costs or their own subscription) — your claude.ai subscription doesn't cover these
• Queries may route through the extension's own servers before reaching Anthropic
• Features like usage tracking, conversation forking, and prompt libraries that are specific to the claude.ai interface aren't available

If you're primarily a claude.ai user who wants to get more out of that specific interface, a claude-specific tool is the right choice. If you want Claude-like AI available anywhere in your browser across multiple tools, a general AI sidebar might fit better.

The One Extension to Install First

If you use claude.ai daily on Claude Pro or Max, install ClaudeKit first. It's the only extension that solves the specific problems with claude.ai's native interface — usage visibility, conversation forking, prompt management — without adding any privacy risk or separate cost.

If you primarily want AI assistance while browsing the broader web (not specifically claude.ai), Merlin or Monica are the most polished general options.

You can run ClaudeKit alongside any of the general AI sidebars without conflict — they operate in different contexts.