Comparison

Kaldi vs Speechmatics

On the evidence we track, Speechmatics leads this comparison with a composite score of 73/100. 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 formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.

Kaldi40

★Speechmatics73

Attribute comparison across 2 tools
Attribute	Kaldi	SpeechmaticsLeader
vioscaleAI score	40 / 100low · 17%	73 / 100medium · 54%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	freemium
Price levelpricing.price_level	free	low
Starting pricepricing.starting_price	-	$0.01
Transparentpricing.transparent	-	✓
Integrations
Countintegrations.count	-	4
Security
Certificationssecurity.certifications	-	SOC 2 Type II, ISO/IEC 27001:2022
Disclosure policysecurity.disclosure_policy	-	✓
Gdprsecurity.gdpr	-	✓
Hipaasecurity.hipaa	-	✓
Iso27001security.iso27001	-	✓
Scorecardsecurity.scorecard	3.9	-
Soc2security.soc2	-	✓
Trust centersecurity.trust_center	-	https://www.speechmatics.com/company/articles-and-news/compliance-breaches-share-price
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=conda&package_name=kaldi&per_page=100 · Last 12m: 0	-
Adoption
Dependent reposadoption.dependent_repos	1	-
Github starsadoption.github_stars	15,496	-
Activity
Commits last 30dactivity.commits_last_30d	0	-
Language
Primarylanguage.primary	Shell	-
Market
Availabilitymarket.availability	-	Available worldwide · Popular in GB, US, EU · HQ GB
Content
Faqcontent.faq	4 items	7 items

Score

vioscaleAI score

Kaldi40 / 100low · 17%

Speechmatics73 / 100medium · 54%

Pricing

Free tier

Kaldi✓

Speechmatics✓

Model

Kaldiopen_source

Speechmaticsfreemium

Price level

Kaldifree

Speechmaticslow

Starting price

Kaldi–

Speechmatics$0.01

Transparent

Kaldi–

Speechmatics✓

Integrations

Count

Kaldi–

Speechmatics4

Security

Certifications

Kaldi–

SpeechmaticsSOC 2 Type II, ISO/IEC 27001:2022

Disclosure policy

Kaldi–

Speechmatics✓

Gdpr

Kaldi–

Speechmatics✓

Hipaa

Kaldi–

Speechmatics✓

Iso27001

Kaldi–

Speechmatics✓

Scorecard

Kaldi3.9

Speechmatics–

Soc2

Kaldi–

Speechmatics✓

Trust center

Kaldi–

Speechmaticshttps://www.speechmatics.com/company/articles-and-news/compliance-breaches-share-price

Vulnerabilities

KaldiCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=conda&package_name=kaldi&per_page=100 · Last 12m: 0

Speechmatics–

Adoption

Dependent repos

Kaldi1

Speechmatics–

Github stars

Kaldi15,496

Speechmatics–

Activity

Commits last 30d

Kaldi0

Speechmatics–

Language

Primary

KaldiShell

Speechmatics–

Market

Availability

Kaldi–

SpeechmaticsAvailable worldwide · Popular in GB, US, EU · HQ GB

Content

Faq

Kaldi4 items

Speechmatics7 items

Capabilities

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

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

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

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.

Kaldi

Open sourceFree tier

as of 2026-08-20verify ↗

Speechmatics

Leader

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 2026-10-12verify ↗

Platform & deployment

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

Platform and deployment support comparison
Supports	Kaldi	Speechmatics
WebPlatforms	✗	✓
AndroidPlatforms	✓	✗
macOSPlatforms	✓	✗
WindowsPlatforms	✓	✗
LinuxPlatforms	✓	✗
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✗	✓
Self-hostedDeployment	✓	✓
On-premiseDeployment	✗	✓
HybridDeployment	✗	✓

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

13 total

Stenograph CATalyst VP
Adobe Premiere
Zapier
Twilio
Python SDK
JavaScript SDK
.NET SDK
Stenograph
Adobe
Microsoft Azure
LiveKit
Vonage
Veritone

Independently observed

Still deciding?

Kaldi 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.