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OpenAI Text-to-Speech Alternative

Unreal Speech is up to 4x cheaper, making it the best OpenAI Text-to-Speech 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 - OpenAI Text-to-Speech

OpenAI Text-to-Speech

Convert text into lifelike spoken audio using one of the six built-in voices.

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.


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 offers a wider range of voice manipulation features such as pitch and speed control, and supports per-word timestamps and phone audio formats.
  • OpenAI Text-to-Speech does not provide these capabilities, but does support multiple languages, a feature not available with Unreal Speech.
  • Both services do not support voice cloning.
  • Overall, Unreal Speech is more versatile for users needing detailed voice customization and specific audio format support, while OpenAI's offering is geared towards users who need multi-lingual support.

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
Pay As You Go
1M characters
Optimized for speed
Pay As You Go (TTS HD)
1M characters
Optimized for quality
  • Unreal Speech offers a more flexible pricing structure with a free tier and multiple paid options, catering to various usage scales from 250,000 characters for free up to 625M characters for enterprise users.
  • In contrast, OpenAI Text-to-Speech operates on a simple Pay As You Go model at $15 / $30 per 1M characters, without providing a free tier or scaling options.
  • Based on the available pricing tiers, Unreal Speech can be significantly more cost-effective, especially for higher volume needs, with options that can accommodate a wide range of budgets and requirements.


  • Unreal Speech offers a more accessible entry point with a free tier, making it a superior option for individuals and businesses starting out with text-to-speech technologies.
  • Additionally, for high volume usage, Unreal Speech presents significantly more cost-effective pricing tiers compared to OpenAI's Text-to-Speech service, which only has a Pay As You Go model without a free option.
  • This makes Unreal Speech a more attractive choice for users requiring substantial character usage.

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You get 250,000 free characters every month.

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Frequently Asked Questions

How easy is it to switch from OpenAI Text-to-Speech 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.
How does the feature set of Unreal Speech compare to that of OpenAI Text-to-Speech?
  • Unreal Speech offers several features not available in OpenAI Text-to-Speech, including per-word timestamps, pitch control, speed control, and support for phone formats like pcm_mulaw.
  • These features enhance customization and integration capabilities, particularly for detailed audio editing and telephony applications.
  • Conversely, OpenAI Text-to-Speech's standout feature is its multilingual support, which Unreal Speech does not offer, making OpenAI's solution more versatile for global applications.
For startups and developers with variable text-to-speech needs, which service would you recommend between Unreal Speech and OpenAI Text-to-Speech?
  • For startups and developers with variable needs, the choice depends on specific requirements.
  • If multi-language support is key, OpenAI Text-to-Speech is the better option.
  • However, for those needing detailed control over voice output, such as pitch and speed adjustments, or applications requiring per-word timestamps, Unreal Speech would be the recommended choice due to its extensive feature set and flexible pricing tiers.
How does the cost of OpenAI Text-to-Speech compare to Unreal Speech for a similar amount of characters?
  • OpenAI Text-to-Speech operates on a Pay As You Go model at $15 / $30 per 1M characters, which doesn't directly compare to any Unreal Speech tier.
  • However, for substantial usage, Unreal Speech offers more characters for the price at higher tiers, such as the Pro plan at $1499/mo for 150M characters, suggesting better scalability for heavy users.
For a user needing phone format compatibility (e.g., pcm_mulaw), which text-to-speech service would you recommend?
  • Unreal Speech would be recommended for users needing phone format compatibility, such as pcm_mulaw, as it supports phone formats, unlike OpenAI Text-to-Speech.
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