LibreAI / Dev Tools / DataDesigner
// devtools · NVIDIA-NeMo/DataDesigner

DataDesigner

NVIDIA NeMo Data Designer: build validated, multimodal synthetic datasets from scratch or from seed data.

★ 2.3k stars⑂ 220 forksApache-2.0updated 2026-10
▦ visual — this project's README ships no embeddable screenshot,
so here's a placeholder. The guide below is complete regardless.
// project facts

Project facts

DataDesigner is an open-source dev tools project by NVIDIA-NeMo (NVIDIA-NeMo/DataDesigner on GitHub). It has 2,314 GitHub stars and 220 forks, is released under the Apache-2.0 license, and was last updated on GitHub on 8 October 2026.

GitHub stars
2,314
Forks
220
License
Apache-2.0
Last updated on GitHub
8 October 2026
Category
Dev Tools
Listing
Full install guide
Official site
Official site
// how it works

How it works

  1. Clarify your goal

    Decide what dataset you need: its columns, distributions, correlations, and how outputs will be validated.

  2. Get the project

    Install data-designer from PyPI, or clone the repo and install from source with make install.

  3. Install and configure

    Configure a model provider (NVIDIA Build, OpenAI, or OpenRouter) by setting its API key, or define custom models through the CLI.

  4. Run your first task

    Build a configuration with sampler, LLM, and validation columns, preview a sample record, then generate the full dataset.

// features

Why people love it

Sampler, LLM, and seed columns

Generate categorical, numeric, and text fields with samplers and LLMs, or start from existing seed datasets and extend them.

Dependency-aware generation

Control relationships between fields so generated records keep meaningful correlations instead of independent random values.

Validation and scoring built in

Validate and score outputs with Python, SQL, custom validators, and LLM judges before data reaches training.

Multimodal and tool-use workflows

Build datasets with image, audio, and video context, and connect generation to local or remote MCP servers while capturing interaction traces.

Plugin extensibility

Add custom column types, seed readers, and processors through the plugin system.

Preview, resume, and monitoring

Preview sample records before committing to a run, and resume and monitor generation from small experiments to large jobs.

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// run it

Run it yourself

  1. Clone and install from source (or skip to pip)

    The PyPI install is the quick route; source installs use the bundled Makefile.

    git clone https://github.com/NVIDIA-NeMo/DataDesigner.git
    cd DataDesigner
    make install
  2. Install from PyPI and set a provider key

    Pick one of the default providers and export its key.

    pip install data-designer
    export NVIDIA_API_KEY=<your key>
  3. Preview your first dataset

    Define columns in Python, then preview a sample record before generating at scale.

    python -c "import data_designer.config as dd; from data_designer.interface import DataDesigner; print('ready')" # see README quickstart for the full config example
// use cases

What you can build

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// faq

Questions, answered

Who maintains it?

It is maintained by NVIDIA as part of the NeMo ecosystem, under the NVIDIA-NeMo GitHub organisation.

Is it free to use?

Yes, the library is Apache-2.0 licensed and free. Model inference is the cost: generation calls LLM providers, so you pay your chosen provider unless you use free tiers or local models.

Does it need a paid API key?

Usually yes: the documented quickstart uses an NVIDIA Build, OpenAI, or OpenRouter API key. Custom and local model configurations are supported through its model configuration system.

How does it compare to a well-known alternative?

Plain LLM prompting tools generate text record by record; Data Designer adds typed samplers, field dependencies, validators, and LLM judges as first-class parts of the dataset definition.

How do I get started?

Run pip install data-designer, export a provider API key, copy the quickstart config from the README, and call preview to see your first synthetic record.

// keep exploring

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// alternatives

Alternatives in Dev Tools

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Get DataDesigner

Free and open — grab the source, star the repo, and start creating.