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