Soniox vs Speechmatics
for Bulgarian speech-to-text

Accurate, real-time transcription and translation for Bulgarian.

Soniox vs Speechmatics pricing, side by side

Speechmatics 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 Speechmatics, side by side.

Pricing calculator

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SonioxvsSpeechmatics

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 Speechmatics for Bulgarian

Get every word right in Bulgarian and every other language.

Soniox delivers native-speaker accuracy across Bulgarian and 60+ languages, with proven performance on noisy audio, overlapping speakers, dialects, and mid-sentence language switches. No model tuning required; it just works in the real world.

"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

Speechmatics supports ~50 languages, but accuracy varies widely including in Bulgarian, especially outside of English or clean audio. It struggles with speaker overlap, accents, and code-switching in real conversation.

Fast. Precise. Always in sync.

Soniox transcribes and translates Bulgarian speech as it’s spoken, with token-level updates and near-zero latency. Transcripts stay in sync. Assistants respond naturally. Nothing gets lost in the stream.

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

Dag-Inge Aas,
Head of AI at Tana

Speechmatics supports streaming but lags behind. No token-level control or early finalization, so transcripts jump or fall out of sync, especially with fast Bulgarian speakers or frequent interruptions.

Understand Bulgarian conversations, not just words.

Real Bulgarian conversations aren’t clean or scripted. Soniox handles rapid speaker turns, overlaps, pauses, and mixed-language exchanges, all in real time. With built-in diarization and smart endpoint detection, it keeps up with natural Bulgarian dialogue as it happens.

"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

Speechmatics supports speaker labels after the fact, but lacks real-time diarization and nuanced understanding of Bulgarian conversational flow.

Built-in domain intelligence.

Soniox adapts to your domain in real time, recognizing technical terms, product names, acronyms, and industry phrasing. You can even steer Bulgarian translations and enforce the vocabulary that matters most.

"Soniox captures complex medical terminology with high accuracy, helping physicians finalize notes faster and focus on patient care."

Max Malyk,
Vice President at DeliverHealth

Speechmatics offers no domain awareness or dynamic vocabulary control. Accuracy depends on pretraining, with no ability to guide how key terms are rendered.

All features. One API. Global by default.

Soniox includes Bulgarian transcription, any-to-any translation, speaker separation, language detection, and domain control. All in one stream, one call, and no stitching required.

Speechmatics lacks built-in translation, speaker separation, or context control. These must be added with external tools or post-processing, creating more complexity and latency.

In-region performance for Bulgarian.

Soniox delivers the same Bulgarian model, accuracy, and latency in every region, keeping all data local for compliance and low-latency performance.

Speechmatics supports VPC and on-prem deployments, but regional presence is limited and setups can vary, leading to differences in Bulgarian model performance.

Trusted by teams building global voice products

Developers choose Soniox for real-time fluency in Bulgarian and beyond

Bulgarian is spoken by 8 million people worldwide — primarily in Bulgaria, with speakers around the world. Developers building for Bulgarian need accuracy, speed, and global scalability. Soniox provides one API that works across 60+ languages – including Bulgarian – with real-time transcription and any-to-any translation built in.

Speechmatics supports many languages, but accuracy in real-world Bulgarian use cases often lags. With Soniox, you get production-ready results from day one.

Higher accuracy in Bulgarian

Soniox consistently beats Speechmatics in benchmarks, with lower word error rates on real-world audio. Bulgarian WER 1.25% vs 1.71% for Speechmatics.

Zero delay

Transcribe Bulgarian conversations instantly, not seconds later. Speechmatics streams in larger chunks, which makes apps feel delayed.

Unified API

Soniox handles both transcription and two-way translation across 60+ languages, so you can build for Bulgarian and scale worldwide. Speechmatics only covers transcription.

Soniox surpasses Speechmatics in any language

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

Frequently asked questions about Soniox vs Speechmatics

Does Soniox support Bulgarian?

Yes. Soniox fully supports transcription and translation for Bulgarian, with production-ready accuracy and real-time performance.

Can Soniox handle code-switching between Bulgarian and English?

Yes. Soniox automatically detects and transcribes mixed speech, switching between Bulgarian and English mid-conversation. Speechmatics requires preselecting one language per request.

Is Soniox cheaper than Speechmatics?

Yes. Soniox costs ~$0.10–0.12/hr, while Speechmatics charges ~$0.24/hr (standard) or ~$0.40–0.56/hr (enhanced). That makes Soniox up to 5x less expensive on enhanced accuracy.

Does Speechmatics support translation?

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

How does Soniox streaming compare to Speechmatics?

Soniox streams token by token in milliseconds, with refinements, manual finalization, and endpoint detection. Speechmatics streams in larger segments, which can feel slower for live use cases.

Does Speechmatics support diarization and timestamps?

Yes, but Soniox provides them in real-time with more structured outputs.

Can Soniox handle multiple languages in one stream?

Yes. Soniox auto-detects and supports mid-conversation shifts. Speechmatics requires you to pre-select a single language per request.

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