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Castro vs Castamatic: catalog facts
Castro	Castamatic
Freemium A limited free version is available. Castro Plus is a paid subscription.	Freemium A free tier is available. Full features require payment.
iOS	iOS
Inbox and queue model keeps a large subscription list under control Silence trimming and volume enhancement on the paid tier	Generates transcripts on the device rather than sending audio away Very configurable playback and playlist behaviour
iOS only Most features require the paid subscription	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.