# The best free AI browser extensions Every option in the catalog for when you need to put an AI sidebar on every website you visit — 11 AI browser extensions, 11 of them free or freemium, with the pricing tier printed on every row. ## Stats - 11 tools listed - 11 free or freemium - 4 with no paid plan at all - 1 sub-categories covered ## FAQ ### What are the best free AI browser extensions? Flocci AI Tools lists 11 of them, ordered free tiers first: Firefox Smart Window, Gemini in Chrome, Opera Browser AI (Aria), Page Assist and MaxAI.me. Every one of them is free or has a free tier. Each entry states what it uniquely does rather than a score. ### Which of these are completely free? 4 on this page are marked fully free with no paid plan at all: Firefox Smart Window, Gemini in Chrome, Opera Browser AI (Aria) and Page Assist. The remaining 7 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up. ### How is this list ordered? Free tools first, then freemium, then trial, then paid, and alphabetically inside each tier. Nobody pays to appear higher: Flocci AI Tools carries no ads, no sponsored slots and no paid listings, so the order reflects price and nothing else. ## Quick picks ### Which AI browser extensions work in a browser with no install? MaxAI.me, Merlin AI, Monica and Sider all work in a browser tab with no install needed — just open the site and go. 4 of the 11 free AI browser extensions listed here are browser-based. ### Which AI browser extensions let you sign in with Google? Gemini in Chrome, MaxAI.me, Merlin AI, Monica and Sider support Google sign-in, so you can start without creating a new account. That's 7 of the 11 free AI browser extensions on this page. ### Which AI browser extensions have a mobile app? Opera Browser AI (Aria), Merlin AI, Monica, Sider and Brave Leo have an iOS or Android app. 5 of the 11 free AI browser extensions here can run on your phone. ### Which AI browser extensions can you self-host or run offline? Firefox Smart Window, Gemini in Chrome, Opera Browser AI (Aria), Page Assist and Brave Leo can be self-hosted or run locally without a browser — useful for privacy, air-gapped networks, or avoiding API rate limits. 6 of the 11 free AI browser extensions here run offline. ## Tools - [Firefox Smart Window](https://aitools.flocci.in/tool/firefox-smart-window) — Free — Built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language - [Gemini in Chrome](https://aitools.flocci.in/tool/gemini-in-chrome) — Free — Gemini side panel that answers questions about the current tab and across tabs - [Opera Browser AI (Aria)](https://aitools.flocci.in/tool/opera-browser-ai-aria) — Free — Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed - [Page Assist](https://aitools.flocci.in/tool/page-assist) — Free — Open-source (MIT) sidebar and ChatGPT-style web UI for local models via Ollama, LM Studio or Chrome's built-in Gemini Nano - [MaxAI.me](https://aitools.flocci.in/tool/maxai-me) — Freemium — One-click rewrite, reply and summarize - [Merlin AI](https://aitools.flocci.in/tool/merlin-ai) — Freemium — Works on any website - [Monica](https://aitools.flocci.in/tool/monica) — Freemium — All-in-one AI copilot for the browser - [Sider](https://aitools.flocci.in/tool/sider) — Freemium — ChatGPT/Claude/Gemini in a browser sidebar - [Brave Leo](https://aitools.flocci.in/tool/brave-leo) — Freemium — Built directly into the Brave browser sidebar — no separate site, no account, no signup required for free tier - [Dia](https://aitools.flocci.in/tool/dia) — Freemium — AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar - [Harpa AI](https://aitools.flocci.in/tool/harpa-ai) — Freemium — AI web automation and monitoring --- Source: Flocci AI Tools — https://aitools.flocci.in/best/best-browser-extensions-copilots Facts last verified: October 2026