About Sider
Sider is the most polished third-party sidebar, with by far the largest audience: about 5 million users and a 4.9 average from about 115,000 ratings on the Chrome Web Store. It comes from Vidline Inc. and puts ChatGPT, Claude, Gemini, DeepSeek, Grok and others in one panel. It is the pick if you want to compare models from several makers in one place.
Group chat is the main draw: you ask several models at once and compare their answers. It also handles page chat, PDF chat, YouTube and article summaries, translation and a right-click menu for explaining or rewriting selected text. It is kept up to date, with version 5.35.3 released on 21 October 2026.
The trade-off is that Sider sits between you and the model makers. Its privacy policy says content needed for a request is sent through Sider's servers to the AI provider behind your chosen model. We could only read excerpts of the policy, so we have not confirmed what it says about training or retention. It asks for access to all sites and the cookies permission, and it is closed source. Treat it as a convenience tool for non-sensitive pages, and use a model maker's own extension for private work.
Pros and cons
- About 5 million users and a 4.9 rating from about 115,000 Chrome ratings
- Ask several models the same question in one group chat
- Covers page chat, PDFs, YouTube summaries and a context menu
- Updated on 21 October 2026
- Closed source, and your content goes through Sider's servers
- Broad permissions, including cookies and access to all sites
- Free use is limited, and we could not confirm current plan details
Permissions
Asks for access to all websites, plus cookies, tabs, scripting, user scripts and the side panel. It also injects into search results pages. Tab capture and tab groups are requested only when needed.
