Sider
Browser Extensions & Copilots
- ChatGPT/Claude/Gemini in a browser sidebar
- Summarize any page, PDF or YouTube video
- Translate, rewrite and explain selections
- Works across every website
AI Chat & Assistants (11)
11 free AI browser extensions and 0 more — pricing tier and real capabilities on every entry. No ads, no sponsored placement.
AllGeneral Purpose ChatbotsBrowser Extensions & CopilotsAI Companions & RoleplayMulti-Model Aggregators & Universal Clients
freemium
Monica
Browser Extensions & Copilots
- All-in-one AI copilot for the browser
- Access to GPT, Claude & Gemini
- Writing, translation and search tools
- Desktop app and memo features
Merlin AI
Browser Extensions & Copilots
- Works on any website
- Summarize YouTube, articles and PDFs
- Multiple frontier models in one place
- Social-media reply generator
MaxAI.me
Browser Extensions & Copilots
- One-click rewrite, reply and summarize
- Chat with any page or image
- Instant translation and grammar fixes
- Prompt library built in
Harpa AI
Browser Extensions & Copilots
- AI web automation and monitoring
- Track prices and page changes
- Scrape and summarize sites
- Custom command workflows
Brave Leo
Browser Extensions & Copilots
- Built directly into the Brave browser sidebar — no separate site, no account, no signup required for free tier
- Access to Claude, Mixtral and Llama models without opening a separate chatbot site
- Conversations never stored on Brave's servers and not used for model training
Dia
Browser Extensions & Copilots
- AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar
- Free for light AI use; a Pro tier lifts the usage caps
- Now backed by Atlassian after its 2026 acquisition of The Browser Company
Opera Browser AI (Aria)
Browser Extensions & Copilots
- Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed
- Powered by a mix of OpenAI GPT and Google Gemini models under the hood
- 2025-2026 upgrade added faster models, higher usage limits and access to open-source local models
- Built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language
- Switch models mid-chat: Google Gemini, Alibaba Qwen, OpenAI gpt-oss-120b, and Mistral Small 4 (added Sept 2026)
- Free with no subscription; beta for macOS and Windows in the US, Canada and France, UK and Germany expected later
- Conversations stay local by default; Mistral partnership uses zero data retention
- Open-source (MIT) sidebar and ChatGPT-style web UI for local models via Ollama, LM Studio or Chrome's built-in Gemini Nano
- Chat with the current webpage without sending data to a cloud service
- Works on Chrome, Edge, Brave, Firefox, Vivaldi and Zen; about 8.2k GitHub stars
- Gemini side panel that answers questions about the current tab and across tabs
- Summarizes pages and videos, compares products
- Available on desktop and Android for US users; expanded to Canada, NZ, India and more
- Auto browse agent reserved for paid Google AI plans
Browser Extensions & Copilots — straight answers
What are the best free AI browser extensions?
Flocci AI Tools lists 11 AI browser extensions, ordered free tiers first: Firefox Smart Window, Gemini in Chrome, Opera Browser AI (Aria), Page Assist and MaxAI.me. All of them are free or have a free tier. Every entry states what it uniquely does, not a score.
Are there completely free AI browser extensions?
Yes — 4 of these are marked fully free with no paid plan attached: Firefox Smart Window, Gemini in Chrome, Opera Browser AI (Aria) and Page Assist. The rest are freemium, trial or paid, and each row states which.
What should I look for in AI browser extensions?
Start with what you need to do: put an AI sidebar on every website you visit. Then check the pricing tier, because "free" here means no paid plan at all while "freemium" means a free tier under paid plans. Every tool on this page lists both.
See the full list →Head-to-head comparisons
Firefox Smart Window vs Gemini in ChromeFirefox Smart Window vs Opera Browser AI (Aria)Firefox Smart Window vs Page AssistFirefox Smart Window vs MaxAI.meFirefox Smart Window vs Merlin AIGemini in Chrome vs Opera Browser AI (Aria)Gemini in Chrome vs Page AssistGemini in Chrome vs MaxAI.me
Free alternatives
Sider alternativesMonica alternativesMerlin AI alternativesMaxAI.me alternativesHarpa AI alternativesBrave Leo alternativesDia alternativesOpera Browser AI (Aria) alternatives
Looking for a ranked shortlist instead? See the best free AI browser extensions.