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Castbox vs Castamatic: catalog facts
Castbox	Castamatic
Freemium A free ad-supported tier is available. Premium is a paid subscription.	Freemium A free tier is available. Full features require payment.
Android, iOS, Web	iOS
In-audio search finds spoken phrases inside episodes Works on phones, web, Alexa, CarPlay and Android Auto	Generates transcripts on the device rather than sending audio away Very configurable playback and playlist behaviour
Advertising and recommendation-heavy interface on the free tier Closed source	iOS only Advanced features require a paid purchase or subscription
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
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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