What is the best free alternative to Dia?
Sider is the closest free alternative to Dia: same Browser Extensions & Copilots sub-category, and it is free tier + paid. ChatGPT/Claude/Gemini in a browser sidebar
Best free Dia alternatives
Looking for a free alternative to Dia? Here are 9 browser extensions & copilots worth trying — 9 with a free tier. Dia itself is free tier + paid.
| Tool | Dia (you searched) | Sider | Monica | Merlin AI |
|---|---|---|---|---|
| Pricing | freemium | freemium | freemium | freemium |
| Best for | AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar | ChatGPT/Claude/Gemini in a browser sidebar | All-in-one AI copilot for the browser | Works on any website |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
Dia alternatives — straight answers
Are there free Dia alternatives?
Yes — 9 of the 9 alternatives listed here are free or freemium: Sider, Monica, Merlin AI, MaxAI.me, Opera Browser AI (Aria). None of them are paid-only.
Is Dia free?
Dia is free tier + paid. There is a free tier you can work in, with paid plans above it.
How were these Dia alternatives chosen?
They are the other tools in Browser Extensions & Copilots, then the rest of AI Chat & Assistants, ordered free tiers first and capped at 9. There is no sponsorship and no paid placement in that ordering — only the pricing tier decides.
All Dia alternatives
Browse Browser Extensions & Copilots →Sider
Browser Extensions & Copilots
✦ WhyA Dia alternative — ChatGPT/Claude/Gemini in a browser sidebar.
- ChatGPT/Claude/Gemini in a browser sidebar
- Summarize any page, PDF or YouTube video
- Translate, rewrite and explain selections
- Works across every website
Monica
Browser Extensions & Copilots
✦ WhyA Dia alternative — All-in-one AI copilot for the browser.
- 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
✦ WhyA Dia alternative — Works on any website.
- Works on any website
- Summarize YouTube, articles and PDFs
- Multiple frontier models in one place
- Social-media reply generator
MaxAI.me
Browser Extensions & Copilots
✦ WhyA Dia alternative — One-click rewrite, reply and summarize.
- One-click rewrite, reply and summarize
- Chat with any page or image
- Instant translation and grammar fixes
- Prompt library built in
Opera Browser AI (Aria)
Browser Extensions & Copilots
✦ WhyA Dia alternative — Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed.
- 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
✦ WhyA Dia alternative — Open-source (MIT) sidebar and ChatGPT-style web UI for local models via Ollama, LM Studio or Chrome's built-in Gemini Nano.
- 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
✦ WhyA Dia alternative — Gemini side panel that answers questions about the current tab and across tabs.
- 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
Harpa AI
Browser Extensions & Copilots
✦ WhyA Dia alternative — AI web automation and monitoring.
- AI web automation and monitoring
- Track prices and page changes
- Scrape and summarize sites
- Custom command workflows
Brave Leo
Browser Extensions & Copilots
✦ WhyA Dia alternative — Built directly into the Brave browser sidebar — no separate site, no account, no signup required for free tier.
- 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