vioscaleAI
Comparison

AssemblyAI vs Speechmatics

No clear leader: AssemblyAI (77.8) and Speechmatics (73.4) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

AssemblyAI full profile →Speechmatics full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
AssemblyAI78
Speechmatics73
Score
vioscaleAI score
AssemblyAI78 / 100medium · 73%
Speechmatics73 / 100medium · 54%
Pricing
Free tier
AssemblyAI✓
Speechmatics✓
Model
AssemblyAIfreemium
Speechmaticsfreemium
Price level
AssemblyAIlow
Speechmaticslow
Starting price
AssemblyAI$0.45
Speechmatics$0.01
Transparent
AssemblyAI✓
Speechmatics✓
Integrations
Count
AssemblyAI8
Speechmatics4
Security
Certifications
Disclosure policy
AssemblyAI✓
Speechmatics✓
Gdpr
AssemblyAI✓
Speechmatics✓
Hipaa
AssemblyAI✓
Speechmatics✓
Iso27001
AssemblyAI–
Speechmatics✓
Pci
AssemblyAI✓
Speechmatics–
Soc2
AssemblyAI✓
Speechmatics✓
Trust center
Reliability
Sla pct
AssemblyAI99.9
Speechmatics–
Status page
AssemblyAI✓
Speechmatics–
Market
Availability
Content
Faq
AssemblyAI7 items
Speechmatics7 items

Capabilities

Feature-by-feature on the axes that matter for speech to text. “-” means undocumented, not absent.

Capabilities
Real time streaming
AssemblyAI✓
Speechmatics✓
Speaker diarization
AssemblyAI✓
Speechmatics✓
Custom vocabulary
AssemblyAI✓
Speechmatics✓
Fine tuning
AssemblyAI-
Speechmatics✓
Word timestamps
AssemblyAI✓
Speechmatics✓
Punctuation formatting
AssemblyAI✓
Speechmatics✓
Pii redaction
AssemblyAI✓
Speechmatics✓
Vertical model
AssemblyAI-
Speechmatics✓
Offline on device
AssemblyAI-
Speechmatics✓
Open source
AssemblyAI-
Speechmatics-

What each one is

The product in its own terms, so the numbers below have context.

AssemblyAI

A hosted service offering speech-to-text transcription across 99 languages with real-time and batch processing, speaker identification, sentiment analysis, and infrastructure for building voice agents.

Independently observed

Speechmatics

A speech-to-text service that converts audio to transcripts, supporting real-time and batch processing with high accuracy, speaker identification, and support for 55+ languages.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

AssemblyAI

from $0.45/hourHybridFree tier

Free tier with limited hours; pay-as-you-go from $0.45/hr

  • FreeFree
  • Pay-as-you-go$0.45 per hour
  • EnterpriseContact sales
as of verify ↗

Speechmatics

from $0.01/charactersUsage-basedFree tier

From $0.12/hr for speech-to-text. Free tier with $100 credits.

  • Melia 1 (General purpose)$0.12/hr
    • 55+ languages
    • Code-switching
    • Language hints
    • Language labeling
    • Custom dictionary
    • +2 more
  • Enhanced$0.38/hr
    • Single-language maximum accuracy
    • Custom dictionary
    • Advanced punctuation
  • Medical (Oak 1)$0.15/hr
    • Clinical conversations and dictation
    • Healthcare vocabulary
    • 55+ languages
  • Standard$0.23/hr
    • High volume and cost-sensitive workloads
  • Linden 1 (Voice agents)Contact sales
  • Text to Speech$0.011 per 1,000 characters
    • First 1 million characters free
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
AssemblyAI✓
Speechmatics✓
CLI
AssemblyAI✗
Speechmatics✓
Deployment
Cloud / SaaS
AssemblyAI✓
Speechmatics✓
Self-hosted
AssemblyAI✓
Speechmatics✓
On-premise
AssemblyAI✗
Speechmatics✓
Hybrid
AssemblyAI✗
Speechmatics✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (1)
  • Twilio

AssemblyAI

13 total - 12 not shared
  • Semantic Kernel .NET
  • Vercel AI SDK
  • OpenAI GPT-5.6 Luna
  • OpenAI GPT-5.6 Terra
  • Google Gemini
  • Semantic Kernel
  • LangChain
  • OpenAI
  • Fireworks
  • AWS Bedrock
  • MiniMax
  • Google Cloud Storage
Independently observed

Speechmatics

13 total - 12 not shared
  • Stenograph CATalyst VP
  • Adobe Premiere
  • Zapier
  • Python SDK
  • JavaScript SDK
  • .NET SDK
  • Stenograph
  • Adobe
  • Microsoft Azure
  • LiveKit
  • Vonage
  • Veritone
Independently observed
Still deciding?

AssemblyAI or Speechmatics: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.