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