vioscale
Comparison

Kaldi vs Speechmatics

On the evidence we track, Speechmatics leads this comparison with a composite score of 81/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Kaldi full profile →Speechmatics full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Kaldi18
★Speechmatics81
Score
Vioscale score
Kaldi18 / 100low · 15%
Speechmatics81 / 100medium · 55%
Pricing
Free tier
Kaldi✓
Speechmatics✓
Model
Kaldiopen_source
Speechmaticsfreemium
Price level
Kaldifree
Speechmaticslow
Starting price
Kaldi–
Speechmatics$0.24
Transparent
Kaldi–
Speechmatics✓
Integrations
Count
Kaldi–
Speechmatics7
Security
Disclosure policy
Kaldi–
Speechmatics✓
Gdpr
Kaldi–
Speechmatics✓
Hipaa
Kaldi–
Speechmatics✓
Iso27001
Kaldi–
Speechmatics✓
Scorecard
Kaldi3.9
Speechmatics–
Soc2
Kaldi–
Speechmatics✓
Vulnerabilities
Adoption
Dependent repos
Kaldi1
Speechmatics–
Github stars
Kaldi15,469
Speechmatics–
Activity
Commits last 30d
Kaldi0
Speechmatics–
Language
Primary
KaldiShell
Speechmatics–
Market
Availability
Kaldi–
SpeechmaticsAvailable worldwide · HQ GB

Capabilities

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

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

What each one is

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

Kaldi

A free, open-source framework for building and deploying speech recognition systems, supporting multiple platforms from desktop to mobile and in-browser execution.

Independently observed

Speechmatics

Leader

Speech recognition and synthesis platform offering real-time and batch transcription, audio analysis, and text-to-speech across 55+ languages. Supports flexible deployment with privacy-first design and compliance-ready infrastructure.

Independently observed

Pricing

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

Kaldi

Open sourceFree tier
as of verify ↗

Speechmatics

Leader
from $0.24/hourUsage-basedFree tier

Usage-based from $0.24/hour; free tier with $100 credit; volume discounts available

  • FreeFree
    • Speech-to-Text (55+ languages)
    • Text-to-Speech (English)
    • Multi-region cloud options
    • 2 concurrent real-time sessions
  • ProUsage-based from $0.24/hour for Real-time Standard transcription
    • Speech-to-Text (55+ languages)
    • Text-to-Speech
    • Real-time sessions (up to 50 concurrent)
    • Speaker diarization
    • Custom vocabulary
    • +5 more
  • EnterpriseContact sales
    • Unlimited concurrent real-time sessions
    • No rate limits
    • Custom models and voices
    • Custom language development
    • SaaS or on-premises or on-device deployment
    • +3 more
as of verify ↗

Platform & deployment

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

Platforms
Web
Kaldi✓
Speechmatics✓
Android
Kaldi✓
Speechmatics✗
macOS
Kaldi✓
Speechmatics✗
Windows
Kaldi✓
Speechmatics✗
Linux
Kaldi✓
Speechmatics✗
CLI
Kaldi✓
Speechmatics✓
Deployment
Cloud / SaaS
Kaldi✓
Speechmatics✓
Self-hosted
Kaldi✓
Speechmatics✓
On-premise
Kaldi✗
Speechmatics✓
Hybrid
Kaldi✗
Speechmatics✓

Integrations

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

Kaldi

Not documented yet.

Speechmatics

Leader
7 total
  • Stenograph CATalyst VP
  • Adobe Premiere
  • Zapier
  • Twilio
  • Python SDK
  • JavaScript SDK
  • .NET SDK
Independently observed

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