Amazon Polly vs Azure Speech
Amazon Polly (Cloud-utility TTS at commodity prices) and Azure Speech (Enterprise hyperscaler TTS with custom-voice depth) are Text-to-speech APIs platforms, priced from $30/1M chars and $22/1M chars respectively. Below: the bottom line, verified head-to-head facts, and real production costs.
Azure Speech wins all 5 decided use cases and leads on core capability dimensions. It supports 100 languages vs Polly's 40, offers instant voice cloning where Polly does not, provides a realtime WebSocket API that Polly lacks, and supports self-hosting while Polly does not. Flagship pricing favors Azure at 22 vs 30 per 1M chars. The only area Polly leads is fast-model pricing and free-tier quota, not enough to offset Azure's breadth advantage.
Azure Speech is our pick for most teams. Start there, or weigh the use-case verdicts below.
If you sign up through links on this page, vsref may earn a commission; programs exist on both sides of most comparisons, and commissions never change verdicts. How we make money
Head-to-head facts
Every row independently verified| Fact | Amazon Polly | Azure Speech |
|---|---|---|
| Price per 1M characters (flagship model) | 30 $/1M charsJul 20 | 22 $/1M charsJul 20 |
| Cheapest paid plan | n/a | $960Jul 20 |
| Free tier quota | 5M chars/mo standardJul 20 | 0.5M characters/month (neural voices, F0 tier)Jul 20 |
| Streaming audio output | ✓ YesJul 20 | ✓ YesJul 20 |
| Instant voice cloning | ✗ NoJul 20 | ✓ YesJul 20 |
| Languages supported | 40 languages and variantsJul 20 | 100Jul 20 |
| Model weights license | closedJul 20 | closedJul 20 |
Pricing: true cost at 3 usage tiers
Effective monthly bill from published rates. Subscription plans resolve to plan fee plus overage; ~950 characters ≈ 1 audio minute.Verdicts by use case
For audiobooks, per-character cost and long-input handling are decisive. Azure flagship pricing is $22/1M chars versus Polly at $30/1M chars, but Azure's fast model is $15/1M chars versus Polly at only $4/1M chars, so the cost advantage depends on the tier chosen. Azure supports 100 languages versus Polly's 40, offers instant voice cloning for narrator customization, and handles up to 64 KB SSML per turn (WebSocket) versus Polly's hard 3,000-char per-request limit, which is a serious bottleneck for book-length narration. Both offer pronunciation dictionaries. The input-length advantage alone makes Azure clearly better for long-form content.
For content creators, voice quality breadth and style range are primary. Azure supports 100 languages vs Polly's 40, and offers instant voice cloning while Polly does not. Azure's flagship model costs $22/1M chars vs Polly's $30/1M chars, making it cheaper at the high-quality tier. Both offer emotion/style controls and professional cloning. Azure's self-host option and realtime WebSocket API are bonuses. The tradeoff is Azure's fast model is pricier at $15/1M vs Polly's $4/1M, but content creators prioritize quality over bulk cheap processing.
Both tools have usage pricing, SSML, word timestamps, and good SDKs. Azure edges ahead on developer flexibility: it supports a realtime WebSocket API while Polly does not, enabling lower-latency interactive products. Azure also supports 100 languages vs Polly's 40, broadening addressable markets. Azure's flagship rate of $22/1M chars is lower than Polly's $30/1M chars. Polly's fast model is cheaper at $4 vs $15, but the WebSocket advantage is decisive for interactive developer use cases.
For dubbing and localization, language coverage and voice cloning flexibility are decisive. Azure Speech supports 100 languages versus Amazon Polly's 40 languages and variants, giving Azure far broader localization reach. Azure also offers instant voice cloning, allowing a source speaker's voice to be quickly replicated across all 100 languages, while Polly lacks instant voice cloning entirely. Both offer professional voice cloning, but the combination of 2.5x more languages and instant cloning makes Azure clearly superior for this use case.
For real-time voice agent use cases, WebSocket support is critical for low-latency bidirectional streaming. Azure offers a real-time WebSocket API while Amazon Polly explicitly does not. Azure also supports instant voice cloning, enabling consistent agent personas, and handles up to 64 KB of SSML per turn over WebSocket, versus Polly's 3,000-character request cap, which matters for longer agent turns. These two gaps make Azure clearly better suited for phone agent and voice bot deployments.
Common questions
Which service is cheaper for high-quality neural voices at scale?+−
Azure Speech charges $22 per 1M characters for its flagship model, while Amazon Polly charges $30 per 1M characters, making Azure the cheaper option at that tier. However, Azure's cheapest paid plan starts at $960 per month, so at lower volumes Polly's pure pay-as-you-go model may be more cost-effective.
Which service has a better free tier for testing?+−
Amazon Polly offers 5 million characters per month on its free tier, including commercial use, while Azure Speech offers only 0.5 million characters per month on its F0 free tier. Polly provides ten times more free characters, making it significantly easier to prototype at no cost.
Does either service support instant voice cloning?+−
Azure Speech supports instant voice cloning, though consent requirements apply. Amazon Polly does not offer instant voice cloning. Both services support professional voice cloning.
Which service supports more languages?+−
Azure Speech supports 100 languages, while Amazon Polly supports 40 languages and variants. Azure covers a significantly broader range of languages, which matters for globally distributed applications.
Does either service support a real-time WebSocket API?+−
Azure Speech provides a real-time WebSocket API, while Amazon Polly does not. Both services support streaming audio output. However, if your application requires low-latency bidirectional communication via WebSockets, Azure Speech is the only option of the two.
Can I deploy either service on-premises or self-host?+−
Azure Speech supports self-hosted and on-premises deployment, while Amazon Polly does not. If your organization requires data to remain within its own infrastructure, Azure Speech is the only viable choice between these two options.
Are both services HIPAA and SOC 2 compliant?+−
Yes. Both Amazon Polly and Azure Speech are SOC 2 Type II certified, and both have a HIPAA BAA available. Either service is therefore suitable for healthcare-related workloads that require these compliance standards.
What is the maximum input length per request for each service?+−
Amazon Polly accepts up to 3,000 characters per request, while Azure Speech accepts up to 64 KB of SSML per turn over WebSocket. For long-form content, Azure's higher per-request limit may reduce the need to split and batch requests.
Related comparisons
ElevenLabs
Google Cloud TTS
OpenAI TTSBest Amazon Polly alternatives →Best Azure Speech alternatives →
When neither is right: browse all Text-to-speech APIs platforms →
If you sign up through links on this page, vsref may earn a commission; programs exist on both sides of most comparisons, and commissions never change verdicts. How we make money