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Compare text-to-speech APIs
on your own text

Test Soniox, OpenAI, ElevenLabs, Google, Cartesia, and Azure on the same text, in real time. Hear the accuracy difference, then compare pricing, before you commit to a text-to-speech API.

See which text-to-speech API is cheapest

Voice quality is only half the decision. The other half is cost. Most text-to-speech APIs price by voices, models, and tiers, so the headline rate hides the real bill. Soniox is one flat rate, no premium voices or tiers billed on top. Set your monthly hours below and see the all-in price, side by side.

Pricing calculator

Stop overpaying for speech AI

Sonioxvs

1,000 hours of speech / month

1025501002505001k2.5k5k10k100k

Pricing assumptions

Based on public pay-as-you-go pricing. Enterprise discounts and committed-use contracts may differ. Some providers charge separately for certain features. The calculator uses the public price for the provider configuration that most closely matches Soniox.

Why compare text-to-speech APIs

Not all text-to-speech systems handle real-world text the same way. The differences become clear when you test edge cases that production systems face daily.

Phone numbers get scrambled by some providers while spoken correctly by others. Email addresses are misread. Foreign names are butchered. Mixed-language text falls apart mid-sentence. These are not rare edge cases. They are the reality of production TTS.

This comparison tool lets you hear exactly how each provider handles the same input. No marketing claims. Just direct audio comparison on the text patterns that matter for your use case.

What to listen for when comparing

Alphanumerics and structured data

Test phone numbers, email addresses, IDs, codes, and account numbers. Some providers scramble digits or misread symbols. Soniox speaks alphanumerics exactly as written.

tts · alphanumerics
Phone number
+1 (415) 555-0132
Spoken

plusonefouronefivefivefivefivezeroonethreetwo

Foreign names and entities

Try person names, place names, and brand names from different languages. Notice which providers apply correct pronunciation rules and which default to English approximations.

tts · pronunciation
English name
Beyoncé
Spoken

bee · YON · say

Language switching mid-sentence

Mix languages in a single utterance. Some providers require separate requests per language. Others handle the transition seamlessly with correct pronunciation for each segment.

tts · language switching
Spanish

Hola, ¿cuál es el tracking number de mi pedido?

Hallucination and text fidelity

Listen for added, dropped, or changed words. The text you send should be exactly what gets spoken. Some providers hallucinate content or alter the input unpredictably.

tts · fidelity
Input text

Your appointment is confirmed for 9:45 AM on June 3.

Spoken

Your appointment is confirmed for 9:45 AM on June 3.

Frequently asked questions

Is this comparison calling real APIs?
Yes. Every play button click makes a live request to the selected provider's API. You are hearing actual synthesis results, not pre-recorded samples.
Can I compare latency here?
No. This tool is for comparing audio quality— accuracy, pronunciation, and naturalness. Latency depends on network hops, proxy behavior, provider region, and whether the provider supports streaming over REST, so the numbers you would see here do not reflect production latency. For real-time use cases, evaluate each provider's streaming API directly.
What languages are supported?
The comparison supports 60 languages. Each provider receives the appropriate language code for their API based on your selection, if your API supports it. Not all providers support every language.
Why do results differ between providers?
Each provider uses different models, voice architectures, and text processing pipelines. Soniox optimizes for accuracy, alphanumerics, and multilingual text. Other providers may prioritize naturalness or different use cases.

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