Amazon Polly

Amazon Polly turns text into lifelike speech with neural and standard voices, SSML support, and a generous free tier for AWS developers.

Overview

Amazon Polly is AWS’s text-to-speech service, converting text into natural speech across dozens of languages. Its Neural Text-to-Speech (NTTS) voices deliver enhanced quality with improved pronunciation and prosody, while standard voices provide cost-effective synthesis for high-volume applications. Polly supports SSML for detailed control over speech output.

Key features include brand voices (custom voice creation), speech marks for viseme generation (useful for lip-sync animation), and real-time streaming. AWS’s free tier offers 5 million characters per month for neural voices for the first year, making it one of the most accessible options for developers building voice applications.

Polly’s speech marks output deserves mention: phoneme and viseme timing data drives lip-sync animation in games and avatars, a niche capability competitors rarely match. Its granular pricing and streaming APIs fit both low-cost hobby projects and high-volume enterprise deployments.

Key Features

• Neural (NTTS) and standard voices across 60+ languages
• SSML support for pronunciation, pacing, and emphasis control
• Brand Voice custom voice creation for enterprise customers
• Speech marks output for lip-sync and animation workflows
• Real-time streaming and batch synthesis
• Deep integration with AWS Lambda, S3, and CloudFront
• Generous free tier: 5M characters/month for the first year
• Speech marks with viseme timing for lip-sync animation
• Streaming synthesis for real-time conversational applications

Pricing

Amazon Polly’s free tier includes 5 million characters per month (neural) for the first 12 months. After the free tier, neural voices cost approximately $16 per 1M characters, and standard voices $4 per 1M characters, with volume discounts for larger usage. The free tier makes experimentation effectively costless for a year, and after that, standard voices remain among the cheapest ways to synthesize speech at volume.

Who Is It For

Amazon Polly is built for AWS developers and enterprises building voice-enabled applications, IVR systems, e-learning content, and accessibility tools.

It suits organizations already operating within the AWS ecosystem.

Game studios and virtual-world developers use Polly to voice dynamic NPC dialogue generated at runtime.

FAQ

Is Amazon Polly free to use?

A substantial free tier covers 5M characters per month for the first year; after that, usage is billed pay-as-you-go with competitive per-character rates.

Does Amazon Polly offer an API?

Yes — REST APIs and AWS SDKs support real-time and batch synthesis with SSML, speech marks, and streaming.

How does Polly compare to Azure or Google TTS?

Polly offers the strongest free tier and AWS integration, Azure provides more voices and languages, and Google leads on WaveNet voice quality.

What is the difference between neural and standard voices?

Neural voices use deep learning for natural prosody and pronunciation at a higher per-character price; standard voices use concatenative synthesis and cost less for high-volume, quality-tolerant use cases.