# Sider

ChatGPT/Claude/Gemini in a browser sidebar. Sider is freemium — a usable free tier with paid plans above it, at sider.ai.

## Facts

- **Pricing tier:** Free tier + paid
- **Works on:** Chrome Extension, Web, iOS, Android, macOS, Windows
- **Works in browser:** Yes
- **Sign-up:** Google sign-in

## Capabilities

- ChatGPT/Claude/Gemini in a browser sidebar
- Summarize any page, PDF or YouTube video
- Translate, rewrite and explain selections
- Works across every website

## FAQ

### What is Sider?

Sider is listed under Browser Extensions & Copilots, in the AI Chat & Assistants category on Flocci AI Tools. ChatGPT/Claude/Gemini in a browser sidebar. It is freemium — a usable free tier with paid plans above it, and it lives at sider.ai.

### Is Sider free?

Sider is freemium: there is a free tier you can work in and paid plans above it. It is one of 426 freemium tools in the catalog, all labelled the same way so you are never surprised by a paywall.

### Can I use Sider in a browser, or is there an app?

Sider works in a normal browser tab with no install. It is available on a Chrome extension, the web, iOS, Android, Mac and Windows. You can sign in with a Google account.

### What can Sider do?

Sider does 4 things the catalog singles out: Chatgpt/claude/gemini in a browser sidebar; summarize any page, pdf or youtube video; translate, rewrite and explain selections; works across every website.

### What is the best free alternative to Sider?

Firefox Smart Window is the closest free alternative: it sits in the same Browser Extensions & Copilots sub-category and is free. Gemini in Chrome, Opera Browser AI (Aria) and Page Assist also start free. The full list is on the alternatives page.

## Related

- [Sider alternatives](https://aitools.flocci.in/alternatives/sider)
- [Browser Extensions & Copilots](https://aitools.flocci.in/category/ai-chat-assistants/browser-extensions-copilots)
- [Best free AI browser extensions](https://aitools.flocci.in/best/best-browser-extensions-copilots)
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Source: Flocci AI Tools — https://aitools.flocci.in/tool/sider

Facts last verified: October 2026