AssemblyAI vs Deepgram
AI Transcription APIs pricing comparison · 2026
AssemblyAI pricing ranges from $0–$0.21/hour, while Deepgram ranges from $0–$4000/minute. AssemblyAI is typically 100% more affordable, though your actual cost depends on tier and team size.
AssemblyAI and Deepgram are two of the most popular speech-to-text API platforms for developers, each optimized for different use cases. AssemblyAI starts at $0.15/hour ($0.0025/min) for its Universal model with a $50 free credit and offers the richest set of audio intelligence add-ons including entity detection, topic detection, summarization, and sentiment analysis. Deepgram starts at $0.0077/min ($0.46/hour) for Nova-3 with a $200 free credit that never expires, and specializes in ultra-low latency real-time streaming under 300ms with per-second billing precision. While AssemblyAI is cheaper per hour for basic transcription, Deepgram excels at real-time applications and provides a more generous free tier for prototyping.
Plan-by-Plan Pricing
| Plan | AssemblyAI | Deepgram |
|---|---|---|
| Free Tier | Free /hour | Custom |
| Pay-As-You-Go | Custom | Custom |
| Enterprise | Custom | Custom |
Cost at Scale
Total cost of ownership — licenses, implementation, and hidden costs included.
AssemblyAI
3 scenariosDeepgram
6 scenariosOur Verdict
Choose AssemblyAI if you need rich audio intelligence features (entity detection, topic detection, auto chapters, summarization, PII redaction) built into a single API, primarily process batch audio rather than real-time streams, or want the lowest base transcription cost at $0.15/hour for the Universal model without add-ons.
Choose Deepgram if you need ultra-low latency real-time streaming under 300ms for live captioning or voice agents, prefer per-second billing precision to avoid overpaying for rounded-up minutes, want a more generous $200 free credit with no expiration for extended prototyping, or are building conversational AI with the Voice Agent API.
Frequently Asked Questions
01 Which is cheaper, AssemblyAI or Deepgram?
For basic speech-to-text transcription, AssemblyAI Universal at $0.15/hour ($0.0025/min) is significantly cheaper than Deepgram Nova-3 at $0.0077/min ($0.46/hour). However, AssemblyAI's audio intelligence add-ons stack on top -- adding speaker diarization, entity detection, and summarization can increase the effective rate to $0.30+/hour. Deepgram's per-second billing also saves money on short audio clips compared to AssemblyAI's per-hour billing. For feature-rich workflows, total costs converge. For pure transcription at scale, AssemblyAI's base rate is lower.
02 Which free tier is better, AssemblyAI's $50 credit or Deepgram's $200 credit?
Deepgram's $200 free credit is more generous and never expires, covering approximately 433 hours of Nova-3 transcription. AssemblyAI's $50 credit covers approximately 185 hours of Universal transcription and is a one-time allocation that does not refresh. For developers needing extended prototyping time, Deepgram's $200 credit with no expiration is clearly superior. However, AssemblyAI's free tier includes access to all audio intelligence features, which Deepgram charges separately for.
03 Should I use AssemblyAI or Deepgram for real-time applications?
Deepgram is the better choice for real-time applications. It offers ultra-low latency streaming under 300ms, per-second billing precision, and a dedicated Voice Agent API for building conversational AI. While AssemblyAI supports real-time streaming at $0.15/hour, Deepgram's architecture is purpose-built for latency-sensitive applications like live captioning, voice assistants, and real-time call analytics. AssemblyAI is better suited for batch processing with rich audio intelligence features.
04 How much does 100 hours of transcription cost on AssemblyAI vs Deepgram?
AssemblyAI's pay-as-you-go rate is approximately $0.15–$0.37/hour depending on features, so 100 hours costs $15–$37. Deepgram charges $0.0043–$0.016/minute ($0.26–$0.96/hour), so 100 hours costs approximately $26–$96. Base transcription is comparable, but costs vary significantly based on features like speaker diarization and sentiment analysis.
05 Which offers a larger free tier: AssemblyAI or Deepgram?
Deepgram offers $200 in free credits, while AssemblyAI offers a free tier with limited hours. For developers evaluating both platforms, Deepgram's $200 credit provides more room for testing before committing to a paid plan.
06 Which is better for real-time streaming transcription?
Both AssemblyAI and Deepgram support real-time streaming transcription via WebSocket APIs. Deepgram is known for lower latency in real-time applications, while AssemblyAI offers stronger accuracy on pre-recorded audio with features like content moderation and PII redaction.