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Sider vs ChatGPTBox: catalog facts
Sider	ChatGPTBox
Freemium Free to start, with paid plans for more usage.	Free Free and open source; model providers may charge for API use.
Windows, Android, iOS, Web, Browser extension	Browser extension
Access to several AI models in one sidebar Page summaries and notes while browsing	Works on any web page Open source with an active community
Closed source hosted service Heavy use needs a paid plan	Needs access to a model provider such as ChatGPT or an API Repository moved, so older links point to the previous owner
Downloadable app, Web application, Browser extension	Browser extension
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.