AssemblyAI vs Deepgram: pricing, quotas & features (2026)
Best-in-class speech-to-text API — Universal models, 99 languages, low-latency streaming
vs. Enterprise-grade speech-to-text + voice agents — Nova + Flux + Aura TTS
Data sourced from vendor documentation · Last updated June 2026
Summary
AssemblyAI and Deepgram are both ai-api platforms, addressing the same core use case with different implementation philosophies and trade-offs. Both offer a free tier, making it easy to prototype without a credit card. Deepgram offers paid plans from $4000/month; AssemblyAI does not publish standard pricing. Deepgram has a broader documented feature set (15 vs 11 features). The right choice depends on your existing stack, team experience, and feature requirements. All pricing and quota data below is sourced from AssemblyAI and Deepgram's official documentation — not generated by AI or estimated.
AssemblyAI vs Deepgram: Comparativa de precios, cuotas y características (2026)
En esta comparativa analizamos AssemblyAI y Deepgram lado a lado — incluyendo precios mensuales, límites del tier gratuito, características técnicas, cuotas de uso (almacenamiento, transferencia, usuarios activos mensuales) y los interfaces de desarrollo disponibles. Todos los datos proceden de la documentación oficial de cada proveedor, no de respuestas generadas por IA.
AssemblyAI es una plataforma de la categoría ai-api — Best-in-class speech-to-text API — Universal models, 99 languages, low-latency streaming. Ofrece 3 tiers de precio: Free Credits gratuito, Pay-as-you-go gratuito, Enterprise (personalizado). Su catálogo en Staxly documenta 11 características y 7 interfazes para desarrolladores.
Deepgram pertenece a la categoría ai-api — Enterprise-grade speech-to-text + voice agents — Nova + Flux + Aura TTS. Ofrece 3 tiers de precio: Pay-as-you-go gratuito, Growth desde $4000/mes, Enterprise (personalizado). Su catálogo documenta 15 características y 8 interfazes para desarrolladores.
A continuación encontrarás los tiers de precio completos de ambas plataformas, una matriz de cuotas del tier gratuito (transferencia, almacenamiento, MAU, llamadas a la API y otros límites), el listado completo de características y los interfaces (CLI, SDKs, REST, GraphQL, MCP) disponibles para integrar cada servicio.
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Pricing tiers
AssemblyAI
Deepgram
Free-tier quotas head-to-head
Comparing free-trial on AssemblyAI vs payg on Deepgram.
| Metric | AssemblyAI | Deepgram |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
Features
AssemblyAI · 11 features
- Advanced Prompting — Streaming with disfluency + code-switching + realtime diarization.
- Audio Intelligence — Sentiment, topic detection, summarization, entity detection, content safety, IAB…
- Auto Punctuation — Smart capitalization + punctuation.
- Keyterm Prompting — Boost accuracy for domain vocabulary.
- LeMUR (LLM framework) — Run LLMs over transcripts: Q&A, summary, action items.
- Medical Mode — Specialized for clinical + medical vocabulary.
- PII Redaction — Auto-redact credit cards, SSNs, addresses, emails.
- Pre-recorded Transcription — Upload audio/video URL or file → transcript.
- Realtime Streaming — WebSocket-based low-latency STT.
- Speaker Diarization — Identify who spoke when.
- Webhooks — Auto-notify when transcription finishes.
Deepgram · 15 features
- Aura TTS — Low-latency text-to-speech (<250ms).
- Data Residency — EU / US / custom regions.
- Diarization — Speaker identification.
- Intent Detection — Detect speaker intents automatically.
- Keyterm Prompting — Boost accuracy for proper nouns + domain terms.
- Language Detection — Auto-detect spoken language.
- On-Prem Deployment — Enterprise: run Deepgram in your infra.
- PII Redaction — Auto-redact sensitive info.
- Pre-recorded STT — Transcribe audio/video files.
- Sentiment Analysis — Per-segment sentiment scores.
- Smart Format — Numbers, dates, times auto-formatted.
- Streaming STT — Realtime WebSocket-based transcription.
- Summarization — Automatic transcript summaries.
- Topic Detection — Auto-extract conversation topics.
- Voice Agent API — Unified STT + LLM + TTS for voice bots.
Developer interfaces
| Kind | AssemblyAI | Deepgram |
|---|---|---|
| SDK | assemblyai (Node), assemblyai (Python), assemblyai (Ruby), assemblyai-go | @deepgram/sdk (Node), deepgram-dotnet-sdk, deepgram-go-sdk, deepgram-rust-sdk, deepgram-sdk (Python) |
| REST | AssemblyAI REST API | Deepgram REST API |
| OTHER | Streaming WebSocket, Webhooks | Streaming WebSocket, Voice Agent API |
Key takeaways
- Both AssemblyAI and Deepgram offer a free tier — AssemblyAI ("Free Credits") and Deepgram ("Pay-as-you-go") — with no credit card required to start.
- Deepgram's entry paid tier (Growth) costs $4000/month; AssemblyAI does not list public pricing.
- Deepgram has a broader documented feature set (15 features) vs. AssemblyAI (11 features) in Staxly's catalog.
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