Comparison

AssemblyAI vs Vosk

On the evidence we track, AssemblyAI leads this comparison with a composite score of 78/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

AssemblyAI full profile →Vosk full profile →

Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.

★AssemblyAI78

Vosk48

Attribute comparison across 2 tools
Attribute	AssemblyAILeader	Vosk
vioscaleAI score	78 / 100medium · 73%	48 / 100low · 39%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	freemium	open_source
Price levelpricing.price_level	low	free
Starting pricepricing.starting_price	$0.45	-
Transparentpricing.transparent	✓	-
Integrations
Countintegrations.count	8	18
Security
Certificationssecurity.certifications	SOC 2 Type 2	-
Disclosure policysecurity.disclosure_policy	✓	-
Gdprsecurity.gdpr	✓	-
Hipaasecurity.hipaa	✓	-
Pcisecurity.pci	✓	-
Scorecardsecurity.scorecard	-	3.3
Soc2security.soc2	✓	-
Trust centersecurity.trust_center	https://www.assemblyai.com/security	-
Vulnerabilitiessecurity.vulnerabilities	-	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=vosk&per_page=100 · Last 12m: 0
Reliability
Sla pctreliability.sla_pct	99.9	-
Status pagereliability.status_page	✓	-
Adoption
Dependent reposadoption.dependent_repos	-	183
Github starsadoption.github_stars	-	15,174
Activity
Commits last 30dactivity.commits_last_30d	-	3
Release
Cadence daysrelease.cadence_days	-	51
Historyrelease.history	-	20 items
License
Spdxlicense.spdx	-	Apache-2.0
Language
Primarylanguage.primary	-	Jupyter Notebook
Market
Availabilitymarket.availability	Available worldwide · Popular in US, GB	-
Content
Faqcontent.faq	7 items	5 items

Score

vioscaleAI score

AssemblyAI78 / 100medium · 73%

Vosk48 / 100low · 39%

Pricing

Free tier

AssemblyAI✓

Vosk✓

Model

AssemblyAIfreemium

Voskopen_source

Price level

AssemblyAIlow

Voskfree

Starting price

AssemblyAI$0.45

Vosk–

Transparent

AssemblyAI✓

Vosk–

Integrations

Count

AssemblyAI8

Vosk18

Security

Certifications

AssemblyAISOC 2 Type 2

Vosk–

Disclosure policy

AssemblyAI✓

Vosk–

Gdpr

AssemblyAI✓

Vosk–

Hipaa

AssemblyAI✓

Vosk–

Pci

AssemblyAI✓

Vosk–

Scorecard

AssemblyAI–

Vosk3.3

Soc2

AssemblyAI✓

Vosk–

Trust center

AssemblyAIhttps://www.assemblyai.com/security

Vosk–

Vulnerabilities

AssemblyAI–

VoskCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=vosk&per_page=100 · Last 12m: 0

Reliability

Sla pct

AssemblyAI99.9

Vosk–

Status page

AssemblyAI✓

Vosk–

Adoption

Dependent repos

AssemblyAI–

Vosk183

Github stars

AssemblyAI–

Vosk15,174

Activity

Commits last 30d

AssemblyAI–

Vosk3

Release

Cadence days

AssemblyAI–

Vosk51

History

AssemblyAI–

Vosk20 items

License

Spdx

AssemblyAI–

VoskApache-2.0

Language

Primary

AssemblyAI–

VoskJupyter Notebook

Market

Availability

AssemblyAIAvailable worldwide · Popular in US, GB

Vosk–

Content

Faq

AssemblyAI7 items

Vosk5 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	AssemblyAI	Vosk
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

AssemblyAI✓

Vosk✓

Speaker diarization

AssemblyAI✓

Vosk-

Custom vocabulary

AssemblyAI✓

Vosk✓

Fine tuning

AssemblyAI-

Vosk-

Word timestamps

AssemblyAI✓

Vosk-

Punctuation formatting

AssemblyAI✓

Vosk-

Pii redaction

AssemblyAI✓

Vosk-

Vertical model

AssemblyAI-

Vosk-

Offline on device

AssemblyAI-

Vosk✓

Open source

AssemblyAI-

Vosk✓

What each one is

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

AssemblyAI

Leader

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

Vosk

A lightweight speech recognition toolkit that works offline and supports over 20 languages. It provides real-time transcription with small models (50 MB) optimized for devices ranging from Raspberry Pi to large clusters.

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

Leader

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 2026-09-29verify ↗

Vosk

Open source

as of 2026-10-15verify ↗

Platform & deployment

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

Platform and deployment support comparison
Supports	AssemblyAI	Vosk
WebPlatforms	✓	✗
iOSPlatforms	✗	✓
AndroidPlatforms	✗	✓
LinuxPlatforms	✗	✓
Cloud / SaaSDeployment	✓	✗
Self-hostedDeployment	✓	✓

Platforms

Web

AssemblyAI✓

Vosk✗

iOS

AssemblyAI✗

Vosk✓

Android

AssemblyAI✗

Vosk✓

Linux

AssemblyAI✗

Vosk✓

Deployment

Cloud / SaaS

AssemblyAI✓

Vosk✗

Self-hosted

AssemblyAI✓

Vosk✓

Integrations

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

AssemblyAI

Leader

13 total

Semantic Kernel .NET
Vercel AI SDK
OpenAI GPT-5.6 Luna
OpenAI GPT-5.6 Terra
Google Gemini
Semantic Kernel
LangChain
Twilio
OpenAI
Fireworks
AWS Bedrock
MiniMax
Google Cloud Storage

Independently observed

Vosk

18 total

Asterisk
Freeswitch
Jigasi
ROS
openFrameworks
Opencast
IBus
GStreamer
nerd-dictation
dicio-android
openaudiosearch
LVTerminal
Dexter
numenvoice
JustSayIt
OpenVoiceOS
CaptionIt
voice_perception

Independently observed

Still deciding?

AssemblyAI or Vosk: 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.