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Sider vs Merlin: catalog facts
Sider	Merlin
Freemium Free to start, with paid plans for more usage.	Freemium Free to start, with a paid plan from 19 US dollars.
Windows, Android, iOS, Web, Browser extension	Android, iOS, Web, Browser extension
Access to several AI models in one sidebar Page summaries and notes while browsing	Several AI models in one place Page, search and video summaries from the extension
Closed source hosted service Heavy use needs a paid plan	Closed source hosted service Fuller use requires 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.