Side Copilot vs Sider

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Free plan: Both have one
Higher Trust score: Sider — 88 vs 80 for Side Copilot
Best fit: Side Copilot: people who keep dozens of tabs open across projects · Sider: Reading and summarizing long articles or PDFs without leaving the page
Platforms: Side Copilot: Chrome extension · Sider: Web, Chrome extension, Windows, macOS, iOS, Android
Status: Both up at our last check — Side Copilot Oct 16, 2026, Sider Oct 14, 2026

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Side CopilotBrowser side-panel extension that sorts tabs into spaces and runs an AI agent over what you have open.

SiderBrowser sidebar that puts GPT, Claude, Gemini, and other models next to any page you're reading.

Side by side

Fact	Side Copilot	Sider
Category	Browser Extensions & Copilots	Browser Extensions & Copilots
Pricing model	Freemium	Freemium
Starts at	$2.90/mo	—
Trust score	80 / 100	88 / 100
Platforms	Chrome extension	Web, Chrome extension, Windows, macOS, iOS, Android
Company	CursorDance, LLC	Sider
Last verified	Oct 16, 2026	Oct 14, 2026

What our research says

Side Copilot

Tab management plus a chat that can actually see the tabs is a better combination than either half alone, and at $2.90 a month it is one of the cheapest paid extensions in this category. Note the rename: the product you find as Side Space is now Side Copilot, which matters when you search for support or reviews. Agent mode driving your live browser is the part to think about before installing.

Pros

Vertical tab sidebar with named spaces, free up to five
Chat mode answers across the tabs currently open
Agent mode automates grouping, history search and workspace rearrangement
Installs on Chrome, Edge, Brave, Vivaldi, Comet, Dia, Sigma, Firefox and Zen
$2.90/month is low for the category, with a 7-day refund window

Cons

Rebranded from Side Space, so older reviews and links point at a dead name
Agent mode needs broad permissions over your browsing
No Safari support
CursorDance, LLC publishes no address or team page

Sider

Sider puts a chat panel on top of whatever page you're on, so you can ask about an article or PDF without copying it into a separate tab. The catch is that heavier use beyond the free daily cap needs a paid tier, and pricing quoted across review sites is inconsistent, so the entry price is worth confirming before committing.

Pros

Works as a sidebar on any web page rather than a separate chat tab
Routes one prompt to several models (GPT, Claude, Gemini, DeepSeek, Grok)
Ships native apps for iOS, Android, Windows, and Mac plus browser extensions
Can chat with PDFs and YouTube videos, not just plain text

Cons

Free tier is capped at a small number of daily uses
Independent pricing write-ups disagree on exact plan costs depending on where you check
No public API for developers

Which one fits

Choose Side Copilot if you need

people who keep dozens of tabs open across projects
researchers who want to query several open pages at once
anyone on a Chromium browser other than Chrome

Choose Sider if you need

Reading and summarizing long articles or PDFs without leaving the page
Comparing answers from several models in one panel
People who want one subscription instead of several separate chatbot logins