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Monica vs Sider: catalog facts
Monica	Sider
Freemium Free to start, with paid plans listed on the pricing page.	Freemium Free to start, with paid plans for more usage.
Windows, macOS, Android, iOS, Web, Browser extension	Windows, Android, iOS, Web, Browser extension
Several AI model families in one interface Works in a sidebar on any webpage	Access to several AI models in one sidebar Page summaries and notes while browsing
Browser extension covers Chrome and Edge only All processing happens on hosted servers	Closed source hosted service Heavy use needs a paid plan
Downloadable app, Web application, Browser extension	Downloadable app, Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	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.