Amazon Polly is the default when you are deep in AWS, with engines spanning cheap-and-robotic to generative. SpeechifyAI's $6 per 1M additional characters on the $499/month Scale plan is below Polly's Neural tier, and instant zero-shot cloning is available on paid plans.
| Capability | SpeechifyAI | Amazon Polly |
|---|---|---|
| Price (per 1M chars) | $6 / 1M additional usage on $499/month Scale | Standard $4, Neural $16, Generative $30, Long-form $100 |
| Pricing model | Per character; no credits, no token math | Per character, tiered by engine |
| Voice quality | Proprietary neural voice models | Standard is robotic; Neural and Generative are far better |
| Voices | Model-compatible catalog; filter GET /v1/voices by each voice's models[] | 100+ voices across engines |
| Languages | 6 languages across 7 locales self-serve; 48 through our team | Broad coverage; available set varies by engine |
| Voice cloning | Instant zero-shot cloning on Starter and above; fine-tuned voices by sales arrangement | No general voice cloning; Brand Voice is a custom enterprise engagement |
| Latency | 56 ms p50 first byte on Simba 3.2, streaming, measured 15 Sep 2026 | Streaming; latency varies by engine |
| Commercial use / free tier | Commercial use on every plan; 500K chars/month free | Commercial use; 12-month AWS free tier |
Amazon Polly does not offer general voice cloning. The only path is Brand Voice, a sales-led custom engagement with a contract minimum and an enterprise review. SpeechifyAI includes instant zero-shot voice cloning on Starter and above, created from a short sample and used at the selected plan's per-character rate on the same streaming endpoint. Fine-tuned voices are arranged through sales.
Polly's Standard engine is $4 per million characters but the voices sound clearly robotic. The Neural engine sounds modern at $16 per million, the Generative engine is $30, and the Long-Form engine is $100, so the workload has to pick the right engine before billing. SpeechifyAI is $6 per 1M additional characters on the $499/month Scale plan across the catalog with consistent quality across every script type, no engine picker on the bill, no SSML tag counting against the rate, and streaming first byte <100ms.
SpeechifyAI covers neural TTS with $6 per 1M additional characters on the $499/month Scale plan across the catalog, instant zero-shot cloning on Starter and above, no model-tier picker, and <100ms median streaming time to first byte on Simba 3.2.
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