Mozilla Common Voice

by Mozilla Foundation

Crowd-sourced multilingual speech corpus — 30k+ hours across 130 languages.

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TL;DR

Best for multilingual ASR training, low-resource language baselines, accent/dialect coverage. Pricing: free.

Category
Open source
License
—
Stars
—
Last push
—
Pricing
free
Platforms
HuggingFace, Web

What it is

Mozilla Common Voice is the largest public crowd-sourced multilingual speech corpus. Volunteers read prompted sentences in their language; the validated subset is the training-grade slice. Versions ship every 6 months (cv-17.0 = 2024-03). License: CC0.

Best for: Multilingual ASR training, low-resource language baselines, accent/dialect coverage.
Watch out for: CC0 1.0 (public domain) · read-prompt speech · variable per-language quality (en/de/fr massive, many languages <50h) · validated vs. invalidated splits matter. Cite: Ardila et al., LREC 2020.

Install / use

from datasets import load_dataset; ds = load_dataset('mozilla-foundation/common_voice_17_0', 'en')

Features

Speaker diarizationNo
Word-level timestampsNo
Streaming / real-timeNo
Languages supported130
HIPAA eligibleNo

Mozilla Common Voice vs Whipscribe

FeatureMozilla Common VoiceWhipscribe
CategoryOpen sourceTranscription APIs
Pricingfree$4–$24 one-time packs (credits never expire) · $2 single unlock · 60 min free on signup
Speaker diarizationNoYes
Word timestampsNoYes
StreamingNoNo
Languages13099
PlatformsHuggingFace, WebWeb, API, MCP

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