You no longer have to open a separate tab to use AI. The best browser extensions put Claude, ChatGPT and Gemini directly on the page you are reading — summarise an article, rewrite an email, or ask questions about any webpage without switching windows. Here are the extensions actually worth installing on Chrome and Safari, what each one is best at, and which to skip.
The best AI browser extensions in 2026 are: Sider (most features, works with multiple AI models), Monica (ChatGPT + Claude + Gemini in one sidebar), Merlin (page summarisation and Q&A), and the official ChatGPT extension. For Safari specifically, Superwhisper and Raycast AI bring AI to all Mac apps including Safari. Most have generous free tiers.
Why Browser AI Extensions Are Worth Using
The practical problem with AI tools is context-switching. You’re reading an article, you want to summarise it — you copy the URL, switch to Claude or ChatGPT, paste it, ask your question, switch back. With a browser extension, all of this happens in a sidebar on the same page in seconds. You highlight text, right-click, and get an explanation, translation, or summary without leaving the page.
In 2026, the best extensions go beyond simple summaries — they let you chat with the AI about the current page, fill in forms with AI assistance, rewrite selected text, translate in-line, and compose emails and social posts from any webpage.
Best AI Extensions for Chrome
1. Sider — Best All-in-One AI Sidebar
Works with GPT-4o, Claude, Gemini in the same sidebar. Chat about any page, summarise, translate, rewrite selected text. Free tier includes 30 AI queries/day.
Sider’s strength is model flexibility — you choose which AI responds (GPT-4o, Claude, Gemini, or others) from a dropdown within the sidebar. The same interface switches between models, so you can cross-check responses without installing separate extensions. The reading mode strips clutter from any article before analysis.
2. Monica — Best for Daily Productivity Tasks
Works on any webpage. Trigger with Cmd+M, select text for instant options: explain, translate, summarise, rewrite. Free tier: 30 queries/day.
3. Merlin — Best for Content Research
Summarises entire web pages and YouTube videos from any URL. Useful for researchers and content creators who consume a lot of web content daily. Free tier: 51 queries/day.
4. ChatGPT Official Extension
Official extension from OpenAI. Opens ChatGPT in a side panel. Simpler than Sider or Monica — best if you only use ChatGPT and want native access rather than a third-party wrapper.
5. Grammarly — AI Writing Anywhere
Embedded directly in Gmail, Google Docs, LinkedIn, Twitter and most text fields. The AI suggestions go beyond grammar — style, engagement score, and full rewrites available on Premium.
Best AI Tools for Safari on Mac
Safari doesn’t support Chrome extensions, so the extension ecosystem is smaller. The best options for Safari AI integration work at the system level rather than as browser-specific plugins:
1. Raycast AI
Press a shortcut anywhere on your Mac — Safari, Mail, Finder, anywhere — and get AI assistance. Raycast AI uses GPT-4o and Claude. Summarise selected text, draft replies, translate — from any app. The most powerful Safari-compatible option.
2. Native Safari AI Features (macOS Sequoia+)
macOS Sequoia and later versions include Apple Intelligence directly in Safari — page summarisation, smart search, and text rewriting tools built into the browser. No extension needed. Quality is sufficient for basic summarisation; for research-grade analysis, third-party tools are still stronger.
How to Choose
- ✅ Chrome power user: Sider — best feature set, multi-model, generous free tier
- ✅ Email and writing focus: Monica + Grammarly combination covers most writing scenarios
- ✅ Research and content consumption: Merlin — YouTube and web page summaries are its strength
- ✅ Mac / Safari user: Raycast AI — works system-wide, not browser-specific
- ✅ Just wants ChatGPT accessible: Official ChatGPT extension — simplest setup
Three AI extensions running simultaneously slow your browser noticeably and can conflict with each other. Pick one primary AI sidebar (Sider or Monica) and complement it with Grammarly for writing. That covers most use cases without the overhead.
Sider’s free tier includes 30 queries/day across GPT-4o, Claude, and Gemini. Install in under 30 seconds from the Chrome Web Store.