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HyperWrite vs Merlin: catalog facts
HyperWrite	Merlin
Freemium Free to start, with paid plans for more use.	Freemium Free to start, with a paid plan from 19 US dollars.
Web, Browser extension	Android, iOS, Web, Browser extension
Autocomplete suggestions inside Gmail and other sites Research with citations from scholarly sources	Several AI models in one place Page, search and video summaries from the extension
Extension is Chrome only Text is processed by a cloud service	Closed source hosted service Fuller use requires a paid plan
Web application, Browser extension	Downloadable app, Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Account 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.