Southeast Asia · Vietnam
Vietnamese conversational speech dataset
2,000 hours of spontaneous Vietnamese conversations recorded in Vietnam across 200 vetted native speakers. Dual-channel audio with time-aligned transcripts, speaker metadata (age, gender, region, device), and full chain-of-consent documentation. Licensed for commercial ASR, TTS, and voice AI training.
Dataset specifications
| Language | Vietnamese |
|---|---|
| Recorded in | Vietnam |
| Speech type | Spontaneous two-person conversations |
| Volume | 2,000 hours |
| Speakers | 200 vetted native speakers |
| Audio | Dual-channel (one channel per speaker) |
| Transcripts | Time-aligned, human-verified |
| Metadata | Age, gender, region, recording device |
| License | Commercial (training & evaluation) |
| Price | $65 per hour of audio |
Need more hours, another dialect or your own recording setup? We collect speech data to spec.
Built for
Training and evaluating speech models that must handle real Vietnamese speech:
- Automatic speech recognition (ASR / STT)
- Text-to-speech & voice synthesis prosody
- Voice agents and IVR for Vietnam
- Speaker diarization & turn-taking models
- Speech LLM / audio-understanding fine-tuning
Why conversational data?
Models trained on read speech consistently underperform on spontaneous audio. Disfluencies, overlap, and natural speech rates aren’t in the training distribution. This dataset closes that gap for Vietnamese. Read more in our guide to conversational vs. scripted speech data.
Free samples
Audit the Vietnamese data yourself
Share your company email and we’ll email you representative audio, matching transcripts, and the metadata schema. Check audio quality, transcript accuracy, and speaker diversity before you spend a dollar.
Public alternatives
Public Vietnamese speech data vs. this dataset
| Source | What it is | License | Commercial training |
|---|---|---|---|
| IARPA Babel Vietnamese Language Pack (LDC2017S01) (opens in a new tab)Linguistic Data Consortium (LDC) | About 201 hours of Vietnamese conversational and scripted telephone speech. | IARPA Babel Vietnamese Agreement via LDC (fee applies): Non-Member version is non-commercial only; For-Profit Member version covers commercial use | Paid license |
| GigaSpeech 2 (Vietnamese) (opens in a new tab)SpeechColab | Large multi-domain ASR corpus for Thai, Indonesian and Vietnamese with automatically produced transcripts. | Apache-2.0 tag on the card, but gated terms restrict use to non-commercial research and education | Not allowed |
| VIVOS (opens in a new tab)AILAB, VNU-HCM University of Science | 15 hours of Vietnamese read speech from 65 speakers, one sentence at a time. | CC BY-NC-SA 4.0 (academic use only) | Not allowed |
| Common Voice Scripted Speech (Vietnamese) (opens in a new tab)Mozilla Common Voice (Mozilla Data Collective) | Read speech recordings in Vietnamese from Mozilla's Common Voice project. | CC0 1.0 | Allowed |
Babel's 8 kHz phone calls need LDC for-profit membership for commercial use; VIVOS and Common Voice are read; GigaSpeech 2 is non-commercial. This dataset is licensed for commercial training.
Licenses as published by each source, checked October 2026. Check the current terms before use.
FAQ
Frequently asked questions
What does the Vietnamese speech dataset include?
2,000 hours of spontaneous two-person conversations from 200 vetted native speakers recorded in Vietnam, delivered as dual-channel audio with time-aligned transcripts, speaker metadata (age, gender, region, device), and consent documentation.
What makes Vietnamese hard for speech recognition?
Vietnamese is tonal, with six tones in the northern standard and fewer in the south, and five of the six are written as marks on the vowel. Northern, central and southern accents differ enough that a model trained on one struggles with the others.
Is there free Vietnamese speech data?
Yes, Common Voice is free for commercial use. The IARPA Babel Vietnamese Language Pack needs a paid license, and GigaSpeech 2 and VIVOS are non-commercial only. This dataset is spontaneous two-person conversation recorded in Vietnam, with speaker metadata, one channel per speaker and signed commercial-use consent.
Can I use this Vietnamese dataset commercially?
Yes. The dataset is licensed for commercial use, including training ASR, TTS, and other voice-AI models. Every speaker has signed explicit commercial-use consent, and we provide the full consent chain for your legal review.
How much does the Vietnamese speech dataset cost?
Pricing is $65 per hour of audio. Volume discounts are available for full-dataset and multi-language purchases. Contact us for a quote.
Can I evaluate samples before buying?
Yes. Request samples with your company email, and we'll email you representative audio files and matching transcripts so your team can audit quality before committing.
Related datasets
You might also need
Compare all 6 Southeast Asian datasets by hours, speakers and price.