Looking for a free alternative to Sider? Here are 9 browser extensions & copilots worth trying — 9 with a free tier. Sider itself is free tier + paid.
| Tool | Sider (you searched) | Opera Browser AI (Aria) | Monica | Merlin AI |
|---|---|---|---|---|
| Pricing | freemium | free | freemium | freemium |
| Best for | ChatGPT/Claude/Gemini in a browser sidebar | Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed | All-in-one AI copilot for the browser | Works on any website |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
Opera Browser AI (Aria) is the closest free alternative to Sider: same Browser Extensions & Copilots sub-category, and it is free. Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed
Yes — 9 of the 9 alternatives listed here are free or freemium: Opera Browser AI (Aria), Monica, Merlin AI, MaxAI.me, Harpa AI. None of them are paid-only.
Sider is free tier + paid. There is a free tier you can work in, with paid plans above it.
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.
✦ WhyA Sider alternative — Free, native AI assistant built into Opera's mainstream and GX browsers, no separate app needed.
✦ WhyA Sider alternative — All-in-one AI copilot for the browser.
✦ WhyA Sider alternative — Works on any website.
✦ WhyA Sider alternative — One-click rewrite, reply and summarize.
✦ WhyA Sider alternative — AI web automation and monitoring.
✦ WhyA Sider alternative — Built directly into the Brave browser sidebar — no separate site, no account, no signup required for free tier.
✦ WhyA Sider alternative — AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar.
✦ WhyA Sider alternative — Free, powered by Llama 4.
✦ WhyA Sider alternative — Free access to Qwen3-series models.