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Piper vs Amazon Polly: catalog facts
Piper	Amazon Polly
Free Free and open source under the GPL.	Paid Pay-as-you-go AWS pricing, with an AWS Free Tier allowance.
Windows, macOS, Linux, Command line	Web
Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency	Many voices across dozens of languages Neural and generative voice engines
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	Requires an AWS account and billing setup Built for developers integrating an API rather than casual use
Downloadable app	Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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