Sider

Browser sidebar assistant for reading, writing and multi-model chat

AI Chat AssistantsFree planOverseas★★★★☆ 4.0

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What is Sider?

Sider is a browser assistant that installs as a sidebar and adds AI actions to the pages you already visit. It can summarise articles and PDFs, explain or translate selected text, rewrite emails, answer questions about an open document and keep a chat thread alongside your work. Requests are routed to several commercial models, and a separate web app covers chat away from the browser. The differentiator is the range of small, page-aware actions: rather than one generic chat box, Sider offers task-shaped buttons for reading, replying, translating and checking text where you meet it.

Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.

Key features

Sidebar chat that reads the page or document you have open
Summary, explain, translate and rewrite actions on selected text
PDF and long-document question answering over uploads
Access to multiple commercial models from one subscription
Writing helpers for email replies, posts and proofreading
Browser extension plus a standalone web chat app

Pros & cons

Strengths

Page-aware actions reduce copying and pasting between tabs
Covers reading, writing and translation in one extension
Model switching lets you trade speed against answer quality

Watch out for

The free quota is modest once you use page reading regularly
The sidebar can feel cramped on smaller laptop screens
Quality depends on how cleanly a site renders for the reader

Best for & use cases

web reading, email drafting, translation, pdf question answering

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FAQ

What does Sider do that a chatbot tab does not?

It reads the page you are on and offers one-click actions over it: summarise, explain, translate, rewrite. That removes the copy-and-paste loop a separate chat tab requires for every article or document.

Which models does Sider use?

It routes to several major commercial chat models and lets you pick one per conversation. The supported list changes over time, and some models are limited to paid plans.

Is there a free plan?

Yes, with a daily quota of queries. Light use of summarising and translation usually fits, but regular document reading and premium models will push you toward a paid tier.