Rapid Data & Model Experimentation

FiftyOne is the first open-source tool that empowers CV/ML engineers and scientists to rapidly evaluate their datasets and models. FiftyOne helps you visualize and explore datasets, identify key scenarios, and debug your models, enabling you to build better ML models, more quickly.

With FiftyOne...

Curate Datasets


Evaluate the quality of your data, find annotation mistakes, and more

Evaluate Models


Identify and fix the failure modes of your model

Use Anytime, Anywhere


Work with your data wherever it is: cloud, remote, or on-premises

Intuitive & Extensible API

FiftyOne is flexible, scalable, and integrates with your existing workflows with a few lines of code. Leverage FiftyOne's schema-free data model, custom fields, and extensible visualization features to unlock the potential of your data.

Better Data, Better Models

Leverage FiftyOne's scientific foundation and trusted workflows to stop wrangling and take control of your data

Curate Datasets

Work with public datasets or create your own from scratch

Evaluate Models

Visualize and correct your model's failure modes

Find Mistakes

Detect and correct label mistakes in your datasets

Visualize Embeddings

Find edge cases, mine hard samples, and more

Take the Dark Arts out of
Data Curation

Without the right tools, ML engineers are left to develop custom solutions and workflows that lack evidence-based methods and repeatability.


Stop asking “why didn't this work?” or “what should I try next?” with no clear answers. FiftyOne transforms the art of curating quality datasets into a science.

Lightweight Tooling, Impactful Features

Documentation & Code Links

Install Guide Docs
Tutorials Docs
Recipes Docs
Release Notes Docs
API Docs
Import and export data in dozens of common formats
Quantitatively assess the uniqueness, mistakenness, and hardness of your data
Connect to your data locally, remotely, or in the cloud... anywhere it is
Evaluate model predictions and interactively explore failure modes
Dynamically search, filter, and sort your data with infinite scrolling
Use embeddings to idenifty scenarios, fix label mistakes, and annotate data
Interactive handoff between code and GUI
Integrate with annotation providers