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Alter vs Kerlig: catalog facts
Alter	Kerlig
Freemium Download and start without a credit card; paid plan details are not given in the research.	Paid Pricing is not given in the research; models are billed through your own provider API…
macOS	macOS
Uses screen and app context for requests Voice commands and dictation that trigger actions	Works in any Mac app with built-in and custom actions Choice of 350+ models through your own API keys
Mac only, macOS 14 or later Pricing is not clearly stated on the homepage	Mac only, macOS 12 or later Requires your own API keys from AI providers
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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