Soniox vs Cartesia
for Spanish speech-to-text

Higher accuracy in real-world Spanish, multilingual real-time streaming, and in-stream translation that Cartesia can't match.

Soniox vs Cartesia pricing, side by side

Cartesia and most speech-to-text APIs charge extra for diarization, translation, and multilingual support, so the headline rate hides the real bill. Soniox is one flat rate with all of it included. Set your monthly hours below to calculate your all-in cost per hour and see how Soniox compares to Cartesia, side by side.

Pricing calculator

Stop overpaying for speech AI

SonioxvsCartesia

1,000 hours of audio / 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 teams choose Soniox over Cartesia for Spanish

Built for Spanish, not just English.

Soniox delivers production-grade accuracy in Spanish and 60+ languages from one streaming model. It understands fast, informal, accented speech in Spanish, and handles mixed-language phrases, spoken codes, and alphanumerics with precision.

"It just gets the words right, any language, any accent, any context. That’s what accuracy is supposed to look like."

Tony Wang,
Cofounder & Chief Revenue Officer at Agora

Cartesia’s Ink 2 streaming model supports English only, so Spanish audio falls back to the separate ink-whisper batch model and gives up real-time streaming.

Very fast speaking Spanish translated in real-time in English

Real-time translation for Spanish.

Soniox returns Spanish transcription and any-to-any translation from a single stream, in 60+ target languages, so your app works for 8 billion people without bolting on extra services.

"It’s so fast, captions appear before people even finish talking. Zero lag. No buffering. Nothing."

Dag-Inge Aas,
Head of AI at Tana

Cartesia provides transcription only, with no translation in or out of the stream.

Know who’s speaking in Spanish, live.

Soniox knows when someone’s speaking, when they’ve stopped, and who’s talking, with built-in real-time speaker separation, sentence boundary detection, and turn-taking awareness.

"Soniox knows who’s speaking and when each thought ends. The real-time transcripts read like true dialogue, not data dumps."

Adam Strom,
Co-Founder & President at Mobius MD

Cartesia has strong built-in turn detection, but speaker diarization is still listed as coming soon.

One API. Everything built in.

Spanish transcription, any-to-any translation, speaker separation, mixed-language support — all from a single model, endpoint, and call. Production-ready from day one.

Cartesia is built for low-latency English voice agents, but multilingual support, translation, diarization, and customization aren’t available in one stream.

Trusted by teams building global voice products

Developers choose Soniox for accuracy in Spanish speech

Spanish is spoken by 500 million people worldwide — across Spain, Mexico, Colombia, Argentina, Peru, Venezuela, Chile, and beyond. Soniox delivers production-ready transcription and translation for Spanish, handling regional accents, code-switching, and real-world audio conditions. Cartesia Ink 2 streams English only, so Spanish isn't supported in real time.

Cartesia is fast and accurate for English voice agents, with built-in turn detection. But in real time it transcribes English only, has no translation, and lacks diarization today. Soniox offers one API that transcribes and translates Spanish (and 60+ others) with high accuracy and smooth real-time performance, so your app instantly works worldwide.

Trusted accuracy

Soniox outperforms Cartesia on real-world Spanish speech, so there's less to fix later. Soniox hits 1.25% WER vs 1.47% for Cartesia.

Spanish streaming, one model

Soniox streams Spanish with token-level updates, refinements, and full transcript control. Cartesia Ink 2 streams English only.

Spanish translation built in

One API delivers transcription and two-way translation across 60+ languages, including Spanish. Cartesia provides transcription only.

Soniox surpasses Cartesia in any language

Get the most accurate, real-time speech-to-text transcription and translation in 60+ languages

Frequently asked questions about Soniox vs Cartesia

Is Soniox cheaper than Cartesia?

For real-time transcription, yes. Soniox costs ~$0.10–0.12/hr, while Cartesia Ink 2 streaming is ~$0.43/hr — and Soniox includes translation, diarization, and timestamps in that rate.

Does Cartesia support Spanish?

Cartesia Ink 2 streaming supports English only; other languages require the separate ink-whisper batch model. Soniox supports 60+ languages in a single real-time model.

Does Cartesia support Spanish translation?

No. Cartesia only provides transcription. Soniox includes two-way, in-stream translation across 60+ languages in the same API call.

Does Cartesia support speaker diarization?

Not yet — Cartesia lists diarization as coming soon. Soniox provides real-time speaker diarization today, in every supported language.

How does turn detection compare?

Cartesia has strong built-in turn detection for English voice agents. Soniox also offers context-aware endpoint detection plus manual finalization, across 60+ languages.

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