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Altered Studio vs Applio: catalog facts
Altered Studio	Applio
Freemium Commercial product; check the Altered site for current plans and prices.	Free Free and open source under the MIT licence.
Windows, macOS, Web	Windows, macOS, Linux
Speech-to-speech conversion keeps the timing and inflection of your performance Curated library of voices plus custom voices	Voice conversion, real-time voice changing and model training in one app Runs locally with no account and no telemetry
Proprietary software Pricing and plan limits are not clear from the homepage	Training voice models needs capable hardware Converting someone else's voice raises consent and copyright questions
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 23, 2026

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