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AssemblyAI vs Deepgram

AssemblyAI or Deepgram? Their plans monthly and yearly, the capabilities their makers state, security and latest updates, side by side — read from the makers' own pages.

In short

  • Both: Text to speech, Speech to text, Many languages, API

AssemblyAI

AssemblyAI provides APIs for transcribing, understanding, and building applications with spoken audio.

Plans

Free tier

Free

  • Up to 185 hours of pre-recorded transcription
  • Up to 333 hours of streaming transcription

Pre-recorded Speech-to-Text API — Universal-3.5 Pro

  • $0.21 /hr
  • Most accurate async speech-to-text model
  • Works across 18 languages
  • Native code switching

Pre-recorded Speech-to-Text API — Universal-2

  • $0.15 /hr
  • Supports 99 languages
  • Trained on over 12.5 million hours of audio data

Pre-recorded Speech-to-Text API — Custom

Price on request

  • Custom rate limits
  • Enhanced concurrency
  • Enterprise-grade flexibility

Realtime Speech-to-Text API — Universal-3.5 Pro Realtime

  • $0.45 /hr
  • Supports 18 languages
  • Context carryover and conversation memory
  • Self-correcting speaker labels and voice isolation

Realtime Speech-to-Text API — Universal-Streaming

  • $0.15 /hr
  • English-only transcription
  • Purpose-built for production voice applications

Realtime Speech-to-Text API — Universal-Streaming Multilingu

  • $0.15 /hr
  • Supports English, Spanish, German, French, Portuguese, and Italian

Realtime Speech-to-Text API — Custom

Price on request

  • Custom rate limits
  • Enhanced concurrency
  • Enterprise-grade flexibility

Sync Speech-to-Text API — Sync API

  • $0.45 /hr
  • Process up to 2 minutes per request
  • Results in ~134 ms (p50)
  • Per-word timing and confidence across 18 languages

Sync Speech-to-Text API — Custom

Price on request

  • Custom rate limits
  • Enhanced concurrency
  • Enterprise-grade flexibility

Prices checked 2026-09-25 on the maker’s page.

Capabilities

  • Text to speech — “Low-latency speech generation built for realtime conversation.” source
  • Speech to text — “Transcribes recorded audio and video asynchronously across 99 languages, with support on speaker diarization, PII redaction, and more features.” source
  • Many languages — “Transcribes recorded audio and video asynchronously across 99 languages, with support on speaker diarization, PII redaction, and more features.” source
  • API — “Build directly against the raw HTTP and WebSocket API for full control over requests and responses.” source

Security

  • SOC 2 Type II — “We maintain a SOC 2 Type 2 report covering security, availability, and confidentiality, audited annually by an independent firm.” source
  • SOC 2 — “We maintain a SOC 2 Type 2 report covering security, availability, and confidentiality, audited annually by an independent firm.” source
  • Not trained on your data — “Your data is never used to train or improve our models when you opt out.” source

Latest updates

About AssemblyAI

Deepgram

Deepgram provides APIs for speech-to-text, text-to-speech, voice agents, and audio analysis.

Plans

Pay As You Go

Free

  • Free $200 Credit then pay-as-you-go
  • All endpoints in public models
  • Speech-to-Text: Up to 50 REST / 150 WSS / 5 Whisper Cloud
  • Text-to-Speech: Up to 45 REST + WSS
  • Voice Agent: Up to 45 WSS
  • Audio Intelligence: Up to 10 REST

Growth

  • $4K+ / year
  • Save up to 20% with pre-paid credits for the year
  • All endpoints in public models
  • Speech-to-Text: Up to 50 REST / 225 WSS / 5 Whisper Cloud
  • Text-to-Speech: Up to 60 REST + WSS
  • Voice Agent: Up to 60 WSS
  • Audio Intelligence: Up to 10 REST

Enterprise

Price on request

  • For businesses with large volumes, data or deployment requirements, or support needs

Prices checked 2026-09-26 by web search.

Capabilities

  • Text to speech — “Text-to-speech built for live conversations.” source
  • Speech to text — “Real-time transcription, production accuracy” source
  • Many languages — “Nova models support 45+ languages” source
  • API — “Deepgram unifies speech-to-text, text-to-speech, and LLM orchestration into a single API, reducing complexity, latency, and cost.” source

Latest updates

About Deepgram