What is the difference between AssemblyAI and Deepgram?

AssemblyAI is best for Developers wanting transcription and audio intelligence APIs, while Deepgram is best for Developers who need fast, accurate, real-time speech-to-text at scale. AssemblyAI starts at $0.37/hr and Deepgram starts at $0.0043/min.

Is AssemblyAI or Deepgram cheaper?

AssemblyAI starts at $0.37/hr with a free tier. Deepgram starts at $0.0043/min with a free tier.

Is there a free alternative to Deepgram?

Both AssemblyAI and Deepgram offer free tiers.

AssemblyAI vs Deepgram

AssemblyAI is Speech-to-text API with speaker diarization, sentiment analysis, and topic detection, while Deepgram is AI speech-to-text API with real-time transcription and custom model training. The biggest difference up front: Deepgram is free, while AssemblyAI starts at $0.37/hr. AssemblyAI is built for developers wanting transcription and audio intelligence apis, whereas Deepgram targets developers who need fast, accurate, real-time speech-to-text at scale.

At a glance

	AssemblyAI	Deepgram
Best for	Developers wanting transcription and audio intelligence APIs	Developers who need fast, accurate, real-time speech-to-text at scale
Starting price	$0.37/hr	$0.0043/min
Free tier	✓	✓
Open source	—	—
Free tier available	✓	✓
Open source	—	—
Custom models	—	✓
Low latency	—	✓
Multi-language	—	✓
Real-time transcription	—	✓
Sentiment	✓	—
Speaker Labels	✓	—
Speech-to-text API	—	✓
Summarization	✓	—
Transcription API	✓	—

AssemblyAI

Strengths

Includes Transcription API as a core feature, purpose-built for transcription & ai audio workflows
Includes Speaker Labels as a core feature, purpose-built for transcription & ai audio workflows
Free for 100 hrs — generous enough for most small teams to get real work done
Includes sentiment alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Developer-oriented tooling may not suit non-technical team members
Ecosystem of third-party integrations is smaller than the market leaders in transcription & ai audio
Limited team/admin features if your organization eventually scales up

Try AssemblyAI → Full review

Deepgram

Strengths

Extremely fast real-time transcription with low latency
Custom model training for domain-specific accuracy
Competitive pricing — cheaper than many alternatives at scale
Supports 36+ languages with accent recognition

Weaknesses

API-only — no consumer-facing product
Custom model training requires labeled training data
Documentation could be more comprehensive
Smaller community than Google or AWS speech services

Try Deepgram → Full review

The bottom line

Pricing: Deepgram is completely free ($200 free credit to start), which makes it the obvious pick if budget is the top concern. AssemblyAI starts at $0.37/hr, but Free for 100 hrs. That cost buys you a more polished or feature-rich experience, so it comes down to whether the extras justify the spend.

Feature gaps: AssemblyAI offers Sentiment, Speaker Labels and Summarization that Deepgram lacks. Deepgram brings Custom models, Low latency and Multi-language that AssemblyAI does not have.

Where each tool shines: AssemblyAI's biggest strengths are: includes transcription api as a core feature, purpose-built for transcription & ai audio workflows. includes speaker labels as a core feature, purpose-built for transcription & ai audio workflows. Deepgram's biggest strengths are: extremely fast real-time transcription with low latency. custom model training for domain-specific accuracy.

Watch out for: With AssemblyAI, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Deepgram, the main complaint is that api-only — no consumer-facing product.

Choose AssemblyAI if...

Your profile matches its sweet spot: developers wanting transcription and audio intelligence apis
You specifically need Sentiment and Speaker Labels
You care about includes speaker labels as a core feature, purpose-built for transcription & ai audio workflows
The free tier works for you: free for 100 hrs

Choose Deepgram if...

Your profile matches its sweet spot: developers who need fast, accurate, real-time speech-to-text at scale
Budget is a hard constraint — Deepgram is free, AssemblyAI is not
You specifically need Custom models and Low latency
You care about custom model training for domain-specific accuracy
The free tier works for you: $200 free credit to start