Europe · Czechia
Czech conversational speech dataset
1,000 hours of spontaneous Czech conversations recorded in Czechia across 100 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 | Czech |
|---|---|
| Recorded in | Czechia |
| Speech type | Spontaneous two-person conversations |
| Volume | 1,000 hours |
| Speakers | 100 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 | $90 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 Czech speech:
- Automatic speech recognition (ASR / STT)
- Text-to-speech & voice synthesis prosody
- Voice agents and IVR for Czechia
- 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 Czech. Read more in our guide to conversational vs. scripted speech data.
Free samples
Audit the Czech 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 Czech speech data vs. this dataset
| Source | What it is | License | Commercial training |
|---|---|---|---|
| ParCzech4Speech 1.0 (opens in a new tab)Charles University, Institute of Formal and Applied Linguistics (ÚFAL), via LINDAT/CLARIAH-CZ | Czech Chamber of Deputies speeches aligned with official transcripts; the audio is downloaded separately from the AudioPSP 24.01 collection. | CC BY 4.0 (alignments and transcripts); source audio in AudioPSP 24.01 is CC0 | Allowed |
| VoxPopuli Czech (transcribed) (opens in a new tab)Meta AI | Transcribed Czech speeches from European Parliament event recordings, 2009 to 2020. | CC0 for VoxPopuli data; the raw audio falls under the European Parliament legal notice (reuse allowed if the entire item is reproduced and the source acknowledged) | Unclear |
| Mozilla Common Voice Czech (Scripted Speech) (opens in a new tab)Mozilla Common Voice (via Mozilla Data Collective) | Read speech recordings in Czech, contributed by Common Voice volunteers. | CC0 1.0 | Allowed |
| Google FLEURS (cs_cz) (opens in a new tab)Google | Read sentences from the FLoRes benchmark, locale cs_cz. | CC BY 4.0 | Allowed |
Free Czech data here is parliament speeches and read sentences; this dataset is spontaneous two-person conversation recorded in Czechia, with dual-channel audio and speaker metadata.
Licenses as published by each source, checked October 2026. Check the current terms before use.
FAQ
Frequently asked questions
What does the Czech speech dataset include?
1,000 hours of spontaneous two-person conversations from 100 vetted native speakers recorded in Czechia, delivered as dual-channel audio with time-aligned transcripts, speaker metadata (age, gender, region, device), and consent documentation.
What makes Czech hard for speech recognition?
Czech has the "ř" sound found in almost no other language, meaningful vowel length, and seven cases that multiply word forms. Spoken Czech also differs from the written standard, with everyday forms like "dobrej" instead of "dobrý".
Is there free Czech speech data?
Yes, ParCzech4Speech, Mozilla Common Voice Czech and Google FLEURS are free for commercial use. VoxPopuli Czech has unclear terms. This dataset is spontaneous two-person conversation recorded in Czechia, with speaker metadata, one channel per speaker and signed commercial-use consent.
Can I use this Czech 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 Czech speech dataset cost?
Pricing is $90 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.
$85/hr