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Sider vs Page Assist: catalog facts
Sider	Page Assist
Freemium Free to start, with paid plans for more usage.	Free Free and open source.
Windows, Android, iOS, Web, Browser extension	Browser extension
Access to several AI models in one sidebar Page summaries and notes while browsing	Sidebar for chatting alongside any web page Works with locally running models such as Ollama
Closed source hosted service Heavy use needs a paid plan	Needs a separate local model server to be useful
Downloadable app, Web application, Browser extension	Browser extension
Closed source	Open source
License not stated	License not stated
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 September 23, 2026

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