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Castbox vs Castro: catalog facts
Castbox	Castro
Freemium A free ad-supported tier is available. Premium is a paid subscription.	Freemium A limited free version is available. Castro Plus is a paid subscription.
Android, iOS, Web	iOS
In-audio search finds spoken phrases inside episodes Works on phones, web, Alexa, CarPlay and Android Auto	Inbox and queue model keeps a large subscription list under control Silence trimming and volume enhancement on the paid tier
Advertising and recommendation-heavy interface on the free tier Closed source	iOS only Most features require the paid 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.