Label Studio

by rafalposwiata


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Label Studio is a swiss army knife of data labeling and annotation tools ✌️

Its purpose is to help you label different types of data using a simple interface with a standardized output format. You're dealing with the custom dataset and thinking about creating your tool? Don't - using Label Studio, you can save time and create a custom tool and interface in minutes.

Label Studio


Quick Start

# Requires >=Python3.6 
pip install label-studio

# Initialize the project in labeling_project path
label-studio init labeling_project

# Start the server
label-studio start labeling_project


It's not necessary to install Visual Studio Compiler, just download "regex" (or other packages you need to compile) from gholke builds corresponding to your python version:

and then

# Upgrade pip 
pip install -U pip

# Install regex
pip install <path-to-downloaded-package>.whl

# Install label studio
pip install label-studio

One Click Deploy

Features 🌟

  • Simple: Crafted with minimal UI design. A simple design is the best design.
  • Configurable: Using high-level jsx tags config, you can fully customize the visual interface for your data. It feels like building a custom labeling tool for your specific needs. And it's fast to do.
  • Collaborative Annotations: Label the same task by two or more people and compare the results.
  • Multiple Data Types: Label Images, Audios, Texts, HTMLs, Pairwise types with different labeling scenarios that you define yourself.
  • Import Formats: JSON, CSV, TSV, RAR and ZIP archives
  • Mobile-Friendly: Works on devices of different sizes.
  • Embeddable: It's an NPM package too. You can include it in your projects.
  • Machine Learning: Integration support for machine learning. Visualize and compare predictions from different models. Use the best ones for pre-labeling.
  • Stylable: Configure the visual appearance to match your company brand, distribute the labeling tasks as a part of your product.

Use Cases

The list of supported use cases for data annotation. Please contribute your own configs and feel free to extend the base types to support more scenarios. Note that it's not an extensive list and has only major scenarios.

Task Description Image Classification Put images into categories Object Detection Detect objects in an image using a bounding box or polygons Semantic Segmentation Detect for each pixel the object category it belongs to Pose Estimation Mark positions of a person’s joints Text Classification Put texts into categories Summarization Create a summary that represents the most relevant information within the original content HTML Tagging Annotate things like resumes, research, legal papers and excel sheet converted to HTML Audio Classification Put audios into categories Speaker Diarisation partitioning an input audio stream into homogeneous segments according to the speaker identity Emotion Recognition Tag and identifying emotion from the audio Transcription Write down verbal communication in text Comparison Pairwise Comparing entities in pairs to judge which of each entity is preferred Ranking Sort items in the list according to some property

Machine Learning Integration

You can easily connect your favorite machine learning framework with Label Studio by using Heartex SDK.

That gives you the opportunities to use:

  • Pre-labeling: Use model predictions for pre-labeling
  • Online Learning: Simultaneously update (retrain) your model while new annotations are coming
  • Active Learning: Perform labeling in active learning mode
  • Prediction Service: Instantly create running production-ready prediction service

There is a quick example tutorial on how to do that with simple image classification:

  1. Create a new project
    label-studio init --template=image_classification imgcls
  2. Clone pyheartex, and start serving:
    git clone
    cd pyheartex/examples/docker
    docker-compose up -d
  3. Specify running server url in imgcls/config.json:
    "ml_backend": {
      "url": "http://localhost:9090",
      "model_name": "my_super_model"
  4. Launch Label Studio server:
    label-studio start imgcls

Once you're satisfied with pre-labeling results, you can immediately send prediction requests via REST API:

curl -X POST -H 'Content-Type: application/json' -d '{"image_url": ""}' http://localhost:8200/predict

Feel free to play around any other models & frameworks apart from image classifiers! (see instructions here)

Label Studio for Teams, Startups, and Enterprises 🏢

Label Studio for Teams is our enterprise edition (cloud & on-prem), that includes a data manager, high-quality baseline models, active learning, collaborators support, and more. Please visit the website to learn more.


Project Description label-studio Server part, distributed as a pip package label-studio-frontend Frontend part, written in JavaScript and React, can be embedded into your application converter Encode labels into the format of your favorite machine learning library label-studio-transformers Transformers library connected and configured for use with label studio


This software is licensed under the Apache 2.0 LICENSE © Heartex. 2020