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