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Amazon Polly Alternative

Unreal Speech is up to 2x cheaper, has more realistic voices, and a simpler API, making it the best Amazon Polly alternative.

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Text to speech API - Unreal Speech

Unreal Speech

Cost-effective, scalable Text-to-Speech API with realistic human-like AI voices.
Text to speech API - Amazon Polly

Amazon Polly

Text-to-speech service to transform text into natural-sounding speech using deep learning technologies.

Voice Quality

Mean Opinion Score
Mean Opinion Score
Mean Opinion Score (MOS) is a numerical measure that represents the perceived quality of audio samples, commonly used in evaluating text-to-speech systems. The score ranges from 1 to 5, with 1 indicating poor quality and 5 signifying excellent quality. These scores are derived from comprehensive, professionally-conducted evaluations, and are anonymized to ensure unbiased results.
  • Unreal Speech significantly outperforms Amazon Polly in voice quality across fiction, non-fiction, and conversation categories, indicating a more human-like and realistic voice output.
  • With mean opinion scores substantially higher, users can expect a more engaging and pleasant listening experience from Unreal Speech.
  • This superior voice quality makes Unreal Speech a preferable choice for applications where natural voice is critical.


Voice Cloning
Per-word Timestamps
Pitch Control
Speed Control
Phone Formats (e.g. pcm_mulaw)
Voice Cloning
Per-word Timestamps
Pitch Control
Speed Control
Phone Formats (e.g. pcm_mulaw)
  • Unreal Speech and Amazon Polly both offer a range of similar features including per-word timestamps, pitch control, speed control, and support for phone formats.
  • However, Unreal Speech does not support multi-lingual capabilities, which Amazon Polly does, potentially making Amazon Polly a more versatile option for users requiring support for multiple languages.
  • Despite these differences, both services cater to a variety of audio processing needs with their feature sets.
  • The choice between the two may largely depend on the specific requirements of the user, such as the need for multi-lingual support or preference for voice quality.

Pricing & Plans

250,000 characters
3M characters
Extra: $16 per 1M chars
42M characters
Extra: $12 per 1M chars
150M characters
Extra: $10 per 1M chars
625M characters
Extra: $8 per 1M chars
1M characters (for first 12 months only)
Pay As You Go
1M characters
  • Unreal Speech offers a cost-effective solution with a tiered pricing model that scales from free up to enterprise levels, accommodating a wide range of usage from 250,000 to 625 million characters per month.
  • Amazon Polly adopts a more straightforward approach with a free tier for the first 12 months and a pay-as-you-go model priced at $16 per 1 million characters thereafter.
  • Comparing the highest tiers, Unreal Speech's Enterprise plan at $4999 for 625 million characters is notably more affordable on a per-character basis than Amazon Polly's pay-as-you-go rate, which would cost approximately $10,000 for the same amount of characters, making Unreal Speech effectively 2x cheaper for high-volume users.


  • Unreal Speech offers superior voice quality with higher Mean Opinion Scores across all categories compared to Amazon Polly, suggesting a more lifelike and engaging listening experience.
  • Despite its lack of multilingual support, it provides scalable pricing options suitable for a wide range of needs, from free to enterprise levels.
  • Amazon Polly, while offering multilingual support and a generous initial free tier, falls behind in voice quality.
  • Unreal Speech stands out for applications demanding high-quality voice output, with advanced features like pitch and speed control standard across both services.

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Frequently Asked Questions

How easy is it to switch from Amazon Polly to Unreal Speech?
  • Very easy, it only takes a few minutes. We give you 250,000 free characters per month, so you can start using our simple text-to-speech API right away.
Which service is more cost-effective for large-scale text-to-speech applications?
  • For large-scale applications, Unreal Speech is more cost-effective due to its higher volume tiers and better scalability options.
  • Its Pro and Enterprise plans are tailored for high-volume needs, offering up to 625M characters at competitive rates, while Amazon Polly's Pay As You Go model might become expensive for similar volumes.
Which text-to-speech service is more suitable for users requiring detailed voice analytics, like per-word timestamps?
  • Both Unreal Speech and Amazon Polly offer per-word timestamps, making them equally suitable for users requiring detailed voice analytics.
  • This feature is invaluable for applications needing precise synchronization between text and speech, such as subtitle generation, interactive applications, or detailed linguistic analysis.
What is the difference in voice quality between Unreal Speech and Amazon Polly?
  • Unreal Speech offers higher voice quality across different categories, with Mean Opinion Scores (MOS) of 4.72 for fiction, 4.37 for non-fiction, and 3.91 for conversation.
  • In contrast, Amazon Polly has lower scores: 3.00 for fiction, 2.51 for non-fiction, and 2.63 for conversation.
What advanced features do both Unreal Speech and Amazon Polly offer?
  • Both Unreal Speech and Amazon Polly offer per-word timestamps, pitch control, speed control, and compatibility with phone formats like pcm_mulaw.
  • These features enhance the customization and flexibility of the text-to-speech services.
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