Czech speech dataset, roughly 500 hours ready to license
Our OTS Czech speech dataset is roughly 500 hours of Czech speech, prompts and conversations, already recorded by Czech speakers in our 30,000+ network, with consent from every speaker for commercial AI training. License it now and train your Czech speech recognition model without waiting on a new collection.
- ~500 h of Czech in stock
- ~35,000 h across the OTS pool
- 100% of speakers consented
- ISO 27001 certified
- SOC 2 report under NDA
- GDPR DPAs and HIPAA BAAs on request
What's in the Czech speech dataset?
The IndecalAI OTS Czech speech dataset is roughly 500 hours of Czech speech, prompts and conversations, recorded by Czech speakers in our network who all consented to commercial AI training. It's already recorded, so you can license it now instead of waiting on a new collection.
Czechia is a strong Central European market for banking, automotive and customer service, and Czech speech data is scarce compared with bigger languages. That makes licensed Czech hours valuable.
Every recording comes with a transcript and metadata about the speaker, the device and the setting, and you can take it as WAV, OGG or another common format. Every order starts with sample clips and a spec sheet, so you can match the data against your model before you agree a licence.
Need more than what's in stock? Czech speakers from our 30,000+ network record new speech to your brief, and our Czech data page covers what we collect to order.
Czech speech dataset at a glance
- Hours
- Roughly 500 hours, already recorded
- Language
- Czech (Čeština), cs
- Content
- Speech, prompts and conversations
- Consent
- Every speaker consented to commercial AI training
- Speakers
- Czech speakers from our 30,000+ network
- Audio and transcripts
- Transcripts and metadata with every recording, in WAV, OGG and more
- Licence
- Terms agreed with each customer, in writing
- Price
- Quoted per order
- Samples
- Czech sample clips sent in reply to your request
- Security
- ISO 27001 certified. SOC 2 report available under NDA. GDPR DPAs and HIPAA BAAs on request.
What comes with every Czech recording
Every Czech recording arrives with the details you need to filter, balance and test, in the audio format your pipeline already reads.
| Detail | In the Czech dataset |
|---|---|
| Speech types | A mix of scripted prompts and natural conversations |
| Recording devices | Mobile phones, laptops and studio microphones |
| Environments | Quiet rooms and noisy, everyday settings |
| Transcripts | Included with every recording |
| Speaker metadata | Speaker details, such as gender and age, for each recording |
| Recording metadata | The device and the setting for each recording |
| Audio formats | WAV, OGG and other common formats |
| Sample rates | Listed for each recording on the spec sheet |
What roughly 500 hours of Czech speech looks like
Put end to end, 500 hours of Czech speech would play for about three weeks, day and night. Nobody listens to all of that before buying, so every order starts with sample clips and a spec sheet instead.
- ~500 hours of Czech speech
- ~30,000 minutes
- ~1.8M seconds of audio
- ~21 days, played back to back
Hours here are recorded audio. When you compare quotes, check whether each one counts audio hours or only the parts where someone is talking.
Czech at a glance, for speech teams
The facts that shape a Czech speech project, from who speaks it to how it's written. Our Czech data page covers what we collect to order.
Status
Official language
Official in the Czech Republic, and one of the official languages of the European Union.
Where it's spoken
Czech Republic
Spoken across Bohemia and Moravia, and widely understood in Slovakia.
Script
Latin alphabet
Written left to right, with háček and čárka marks, as in č, ř, š and á.
Family
Slavic
A West Slavic language, very close to Slovak.
Varieties
Standard and common Czech
Formal Czech differs from everyday Common Czech, and Moravian speech differs from Prague speech.
Codes
cs · ces
ISO 639-1 and ISO 639-3 codes. Locales speech APIs often use: cs-CZ.
Czech speech dataset, voice dataset or speech corpus?
The same Czech data goes by several names, depending on who's asking. Here's what each name usually means.
Czech speech dataset
The general term
Recorded Czech speech with details about each recording, for training and testing speech models. The name this page uses.
Czech voice dataset
Usually the same thing
Some teams mean voice for text-to-speech or speaker recognition, which needs cleaner audio. Part of our data was recorded in a studio, so ask for those recordings.
Czech audio dataset
A wider term
It can include music or background sound. Ours is speech audio: Czech speech, prompts and conversations.
Czech speech corpus
The research name
A structured collection of recordings and their details. Commercial datasets are corpora too, licensed instead of published.
Czech ASR or speech-to-text dataset
Speech plus what was said
For training a model that turns Czech audio into text. Every recording in our Czech dataset comes with a transcript.
Czech speech recognition data
Speech plus what was said
For training a model that turns Czech audio into text. Every recording in our Czech dataset comes with a transcript.
What makes Czech hard for speech recognition
These are the things a Czech speech model trips on, and what to listen for in any Czech sample, ours included.
Formal and everyday Czech
People speak Common Czech day to day, with different endings from formal Czech, like dobrý and dobrej. Decide whether transcripts follow the speech or formal spelling.
Háček and čárka
Czech marks change letters and vowel length, but people sometimes type without them. Check that the transcripts keep every mark your model should output.
Accents across Czechia
Prague, Brno and other Moravian speech differ in sounds and words. Check that the speaker mix covers the users you're building for.
The ř sound
Czech ř is a rare sound few other languages have, and vowel length changes words. A model needs Czech speech to learn both.
What teams build with a Czech speech dataset
Common uses for Czech speech that's already recorded. They show the kind of work, and they aren't client names.
Czech speech recognition
Train or fine-tune a Czech speech-to-text model, or adapt a multilingual model so it handles Czech well.
Voice bots and IVR
Teach a voice bot how Czech callers actually ask for things, in the words and accents they use.
Customer service calls
Czech speech for models that route, transcribe or summarize customer calls about accounts, orders and claims.
Voice in the car and at home
A Czech base for in-car assistants and smart devices, before recording commands in the real setting.
Support and speech analytics
Czech conversations for models that find intent, sentiment or topics in support calls and chats.
Testing a Czech model
Held-back Czech recordings your model never trained on, to measure word and character error rate before launch.
How many hours of Czech speech do you need?
It depends on the model you start from and how close your users sound to the training data. These are rough starting points that come up often in speech work. Your own tests should decide.
| Goal | Rough starting point | With our Czech data |
|---|---|---|
| Test a model you already have | A few hours your model never trained on | A test set cut from stock and kept out of training |
| Fine-tune a multilingual model, such as Whisper or wav2vec 2.0 | Tens to a few hundred hours | Roughly 500 hours in stock covers it |
| Adapt to one domain, like banking calls | A smaller set that sounds like your users | Stock as a base, plus a custom top-up in your domain |
| Train a Czech model from scratch | Thousands of hours | Stock as a base, plus a larger custom collection |
Free Czech speech datasets or a licensed one?
Public corpora such as Mozilla Common Voice, ParCzech and FLEURS have done a lot for Czech speech research. They cover what their creators chose to record, like read sentences, crowd recordings or broadcast speech, and each comes with its own licence and terms of use. Here's how they compare with a licensed dataset.
| Topic | Public Czech corpora | Our Czech speech dataset |
|---|---|---|
| Licence | Set by each corpus, and some limit redistribution or changes | Agreed with you in writing, for what you're building |
| Consent | Covered by each project's own terms | Every speaker consented to commercial AI training |
| What it sounds like | Whatever the project recorded | Speech, prompts and conversations, with sample clips first |
| Who else trains on it | Anyone who downloads it | Set in the licence we agree with you |
| Filling gaps | Up to you | Recorded to your brief by the same network |
| Support | Community forums | A named contact from sample to delivery |
How to check a Czech speech sample
Thirty minutes with the sample clips and the spec sheet tells you most of what you need. Use the same list on any vendor.
| Check | What to look for | Where to find it |
|---|---|---|
| Accents | Speakers from the regions your users come from | The speaker mix on the spec sheet, and the clips |
| Everyday speech | The way your users really talk, including any mixing with other languages | Listen to the clips |
| Script | Transcripts in the script and spelling your model should output | The transcript format on the spec sheet |
| Audio | A sample rate and recording setup close to your product | The sample rate on the spec sheet |
| Numbers | Amounts, dates and phone numbers written one consistent way | Transcripts of the clips |
| Rights | Consent that covers commercial AI training, and a licence that fits | Ask for the licence terms before you buy |
From Czech sample clips to licensed data
Your named contact runs it from the first question to delivery.
-
01
Ask
Tell us how many Czech hours you need and what the model is for.
You get A reply within one business day
-
02
Sample and spec sheet
We send Czech sample clips and the spec sheet in reply.
You get Czech clips and the spec sheet
-
03
Licence and quote
We agree the licence terms and send a quote for the order.
You get Written licence terms and a quote
-
04
Delivery
The licensed Czech speech is delivered to you.
You get Licensed Czech speech with transcripts
-
05
Fill the gaps
Accents, devices or domains that are missing get recorded to your brief.
You get New Czech speech, recorded to your brief
Get Czech sample clips Start with the sample clips, then decide.
Czech speech data terms
The words that come up when you buy or build Czech speech data. The full glossary covers every data type.
- Háček
- The small v-shaped mark in č, ř, š and ž that changes a letter's sound.
- Common Czech
- The everyday spoken form of Czech, with its own endings and sounds.
- Vowel length
- How long a vowel is held. In Czech, a long vowel, marked as á, can change the word.
- Speaker metadata
- Details recorded about each speaker, such as gender and age, that let you check the speaker mix against your users.
- OTS dataset
- Short for off-the-shelf dataset: data already collected and ready to license before a buyer asks for it, instead of recorded to one buyer's brief.
- Word error rate (WER)
- The share of words a speech model gets wrong against a reference transcript. Lower is better.
- Character error rate (CER)
- The same idea counted in characters, useful for Czech, where case endings make WER look worse than the model is.
- Utterance
- One stretch of speech by one speaker, such as a single prompt read aloud or one turn in a conversation.
More Czech and speech data
Every language in stock is on the off-the-shelf speech datasets page. Related speech datasets: Slovak, Polish, German and Hungarian.
OTS speech datasets
Around 35,000 hours across languages, ready to license.
Czech data to your brief
Czech speech, text and translation, collected to order.
Transcription
Czech audio turned into timed text, checked by people.
Languages
100 languages, collected to order.
Data and model evaluation
Held-back Czech speech scored against your targets.
Questions about the Czech speech dataset
Straight answers about licensing Czech speech. The off-the-shelf FAQ covers questions that apply to every language.
Do you have a Czech speech dataset ready to license?
Yes. Roughly 500 hours of Czech speech, prompts and conversations are already recorded and ready to license, as part of our off-the-shelf speech pool.
What's in the Czech speech dataset?
A mix of scripted prompts and natural conversations in Czech, recorded on mobile phones, laptops and studio microphones, in quiet and noisy settings. Every recording comes with a transcript and metadata about the speaker, the device and the setting, in WAV, OGG or another common format.
Does it include everyday Czech?
Everyday Czech differs from the formal language, so ask how much informal speech is in the hours you'd license. The sample clips let you hear it before you commit.
Did every speaker consent to AI training?
Yes. Every speaker gave consent for their recordings to be used for commercial AI training.
How is the Czech dataset licensed?
Licence terms are agreed with each customer, in writing, before delivery. That includes how you can use the data and whether anyone else can license the same recordings.
How much does the Czech speech dataset cost?
We quote each order on its own, based on the hours you need and the licence terms. Send your request and your named contact comes back with a quote.
Can we hear Czech samples first?
Yes. Ask and we send Czech sample clips with the spec sheet, so you can check the audio before you commit.
What if we need more than 500 hours, or a specific accent?
We collect it. Czech speakers from our network record new speech to your brief, such as a region, an age group, a device or a domain, and it can sit alongside the hours you license from stock.
Is this the same as a Czech voice dataset or speech corpus?
For most uses, yes. Speech dataset, voice dataset, audio dataset and speech corpus are names for the same thing: recorded Czech speech with details about each recording. If you need studio-quality voice for text-to-speech, ask for the recordings made in a studio.
Can we use it as a Czech speech-to-text (ASR) dataset?
Yes. Every recording comes with a transcript, so it's ready for training and testing Czech speech-to-text models. The spec sheet shows the transcript style, so you can check it matches your pipeline before you license it.
Why not use a free Czech speech dataset?
Public Czech corpora are a good start for research. Each one has its own licence and terms of use, and they cover what their creators chose to record, such as read sentences or broadcast speech. Read the licence before you train a commercial model on one, and check that it sounds like your users.
What does OTS mean?
OTS stands for off-the-shelf: data that's already recorded and ready to license, instead of collected after you order. Our OTS Czech speech dataset is roughly 500 hours.
How many hours of Czech speech do we need?
It depends on your starting model. A test set can be a few hours, fine-tuning a multilingual model often starts at tens to a few hundred hours, and training from scratch takes thousands. Your own tests should decide.
Can we fine-tune Whisper or wav2vec 2.0 on it?
Yes. Teams commonly fine-tune open speech models like these on licensed Czech speech, and every recording comes with a transcript in WAV, OGG or another common format. The spec sheet shows the transcript style, so you can plan any conversion before you train.
Do you work with US teams?
Yes. We take calls in US Eastern mornings, which is evening in India. We're ISO 27001 certified, our SOC 2 report is available under NDA, and we sign GDPR data processing agreements and HIPAA business associate agreements on request.
Get Czech sample clips
Say roughly how many Czech hours you need and what the model is for. We'll send sample clips and the spec sheet.
- Your named contact replies within one business day.
- We send Czech sample clips and the spec sheet.
- We agree the licence terms and send a quote.
This opens your email app with the request filled in. Nothing is sent until you press send. You can also use the contact page.