Independent · Vendor neutral
Best Speech to Text API Providers Review
Accuracy claims, diarization quality, pricing add-ons, and compliance posture — documented with the same template for every provider, so the differences are actually comparable.
Provider profiles
All vendorsModulate
Modulate's Velma-2 is an ensemble speech-to-text model built for difficult, real-world audio. This page reviews its architecture, features, accuracy reporting, deployment options, and pricing.
Free tier: Free trial hours available
View profileDeepgram
Deepgram is an enterprise voice AI platform offering speech-to-text, text-to-speech, and a Voice Agent framework. This page reviews its models, features, pricing, deployment options, and reported accuracy.
Free tier: $200 in free credits
View profileAssemblyAI
An independent, technical overview of AssemblyAI for speech-to-text: features, pricing, accuracy, deployment, and support.
Free tier: x hours
View profileAWS Transcribe
An independent, technical overview of AWS Transcribe for speech-to-text: features, pricing, accuracy, deployment, and support.
Free tier: x hours
View profileGoogle Speech-to-Text
An independent, technical overview of Google Speech-to-Text for speech-to-text: features, pricing, accuracy, deployment, and support.
Free tier: x hours
View profileOpenAI Whisper / Azure Speech
An independent, technical overview of OpenAI Whisper / Azure Speech for speech-to-text: features, pricing, accuracy, deployment, and support.
Free tier: x hours
View profile
Compare by feature
All featuresSpeaker Diarization
Compare speaker diarization from Modulate, AssemblyAI, Deepgram, Google Cloud and Microsoft Azure, including pricing, limitations, benchmarks and buyer evaluation tips.
Accuracy & Word Error Rate
What Word Error Rate measures, why vendor WER numbers don't compare, which public benchmarks to trust, and how to benchmark transcription accuracy on your own audio.
Language & Accent Support
How many languages each speech-to-text provider supports, quality on low-resource languages, and robustness across accents and dialects.
Pricing & Cost Per Minute
A side-by-side comparison of speech-to-text pricing models, per-minute and per-hour rates, add-on costs, and total cost of ownership.
Emotion & Sentiment Analysis
How speech-to-text providers detect emotion, sentiment, and behavioral signals, what those add-ons cost, and how to evaluate them.
Redaction, Compliance & PII
HIPAA and SOC 2 posture, PII and PHI redaction features, on-premise options, and data retention policies across speech-to-text providers.