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

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