Deploy high-quality, natural-sounding human voices in dozens of languages.
Grade: A — Score: 90/100
Amazon Polly leverages powerful neural networks and generative voice engines to synthesize speech from text, providing a wide array of lifelike voices across multiple languages. This technology enables the creation of applications that can engage users through natural-sounding audio, meeting diverse linguistic and accessibility needs.
The service is designed for seamless integration into existing applications via a simple API, allowing developers to quickly add voice capabilities to their products. Users can generate speech for various use cases, including media voiceovers, interactive voice response systems, and mobile applications, enhancing user engagement and experience.
However, while Amazon Polly offers robust features and capabilities, users must consider potential risks such as dependency on cloud services, data privacy concerns, and the need for internet connectivity to access the service. Understanding these factors is crucial for businesses looking to implement text-to-speech solutions effectively.
Standard: $4/1M characters
Neural: $16/1M characters
Generative: $30/1M characters
Long-Form: $100/1M characters
Consider switching to Google Text-to-Speech: Google offers similar text-to-speech capabilities with a different set of voices and languages.
Amazon Polly is a developer-focused AWS service with four speech engines priced from $4 to $100 per million characters, IAM controls, speech marks, and native AWS integrations. ElevenLabs adds a creator studio, dubbing, Voice Design, and self-service voice cloning, with Starter at $6 per month for 30,000 credits. Choose Polly for AWS-native application infrastructure and predictable per-character billing, or ElevenLabs when creative production and cloning matter more than the lowest utility-speech cost.
Use Standard for the lowest-cost utility speech, Neural when you want a broader balance of naturalness and price, Generative for more expressive conversational delivery, and Long-Form for supported narration use cases. The published rates are $4, $16, $30, and $100 per million characters respectively. Validate the exact voice, SSML behavior, speech-mark support, and AWS Region before choosing because those capabilities differ by engine.
Amazon Polly does not provide self-service instant voice cloning. AWS offers Brand Voice as a custom engagement in which the Polly team helps define a persona, select and record a voice actor, train the neural model, and make the exclusive voice available to specified AWS account IDs. Buyers must contact an AWS account manager or sales, and AWS does not publish a standard Brand Voice price.
AWS Service Terms state that output generated with AI Services is Your Content, and the Polly pricing page says generated speech may be cached and replayed at no additional Polly cost. You still need rights to the text, trademarks, music, voice talent, and other material you submit or combine with the output, and you remain responsible for applicable notices and consent. A legal review is appropriate for regulated, impersonation, or branded-voice uses.
The current AWS voice table lists 42 language or locale entries, often with multiple voices and different engine availability. AWS separately documents 43 generative voices across 23 language or locale entries, neural voices in 36 languages and variants, and six Long-Form voices split between US English and Spain Spanish. Check the live voice table and your target AWS Region because a language entry does not mean every voice supports every engine everywhere.
Yes. Amazon Polly supports SSML controls for pronunciation, pauses, rate, pitch, volume, language changes, and selected speaking styles, but not every tag works with every engine. You can also upload pronunciation lexicons for names, acronyms, and specialized terms, and apply up to five lexicons to a request.
Yes. SynthesizeSpeech returns an audio stream in formats including MP3, Ogg Vorbis, raw PCM, Mu-law, and A-law, while the Generative engine has bidirectional input and output streaming in seven documented Regions. Polly can return sentence, word, viseme, and SSML speech marks as JSON for synchronization, but a speech-mark request returns metadata instead of audio and the Generative engine does not currently support speech marks.
Amazon Polly can process longer passages with StartSpeechSynthesisTask, which accepts up to 100,000 billable characters or 200,000 total characters and writes the result to Amazon S3. The separate Long-Form engine offers four US English and two Spain Spanish voices at $100 per million characters and is available only in US East (N. Virginia). Polly supplies the speech file, not a full audiobook editing, mastering, chapter-management, or publishing workspace.
AWS public documentation is internally inconsistent on retention. The Amazon Polly security best-practices page says Polly does not retain submitted text, while the current AWS Service Terms say AWS may use and store Polly AI Content for service improvement and AI development, potentially in another Region. You can configure an AWS Organizations AI services opt-out policy, which AWS says also deletes historical service-improvement copies that are not required to provide the service.
No. AWS describes Amazon Polly as a fully managed cloud service accessed through APIs, SDKs, the AWS CLI, or the AWS console, and says its source cannot be downloaded or deployed in your environment. You can save, encrypt, cache, and replay generated audio on your own infrastructure after synthesis, but generating new speech requires access to the AWS service.
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