Deepgram
AI speech-to-text API built for developers with industry-leading speed and accuracy.
Quick take
Deepgram is the best speech-to-text API for most developers. The combination of accuracy (4.7% WER), speed (sub-300ms streaming), and price ($0.26/hour) is hard to beat. AssemblyAI is the closest competitor, with slightly lower accuracy but stronger LLM-powered features (summarization, topic detection via LeMUR). Choose Deepgram for raw transcription speed and cost. Choose AssemblyAI for post-processing intelligence.
Deepgram scorecard
How we gradeFastest streaming speech API with strong developer value.
Overview
Deepgram is a speech-to-text API built for developers who need fast, accurate transcription at scale. Unlike consumer tools (Otter, Fathom), Deepgram is pure infrastructure: you send audio in, you get text back. The company has raised $86M, employs 101-250 people, and processes billions of minutes of audio per year. With 440 G2 reviews at 4.6/5 and 76% satisfaction, Deepgram is one of the most adopted speech APIs in the developer community. Their Nova-2 model consistently ranks at or near the top of independent accuracy benchmarks.
Strengths & limitations
Strengths
- +Fastest streaming transcription available
- +Competitive accuracy
- +Good developer experience and docs
Limitations
- –Fewer features than AssemblyAI for intelligence
- –Custom models require enterprise plan
- –Startup, long-term viability uncertain
Pricing
Pay As You Go: $0.0043/minute for Nova-2 (pre-recorded), $0.0059/minute for streaming. $200 free credit to start. Growth and Enterprise tiers offer volume discounts, custom models, and on-premise deployment. No minimum commitment on Pay As You Go.
Who it's for
Developers building voice applications, transcription features, or real-time captioning. Teams that already have an audio capture pipeline and need the best accuracy-to-price ratio for the transcription step. If you need an all-in-one meeting recording solution (capture + transcription + summaries), look at Recall.ai + Deepgram as a stack, not Deepgram alone.
Verdict
A- · 84/100Deepgram is the best speech-to-text API for most developers. The combination of accuracy (4.7% WER), speed (sub-300ms streaming), and price ($0.26/hour) is hard to beat. AssemblyAI is the closest competitor, with slightly lower accuracy but stronger LLM-powered features (summarization, topic detection via LeMUR). Choose Deepgram for raw transcription speed and cost. Choose AssemblyAI for post-processing intelligence.
Key features
- Real-time streaming transcription
- Pre-recorded audio API
- Custom model training
- Speaker diarization
- Language detection
What users say
Works well with different voices and accents, even with background noise or strong accents.
G2
Can sometimes struggle when the audio is very noisy or when multiple people speak over each other.
G2
