Label Studio

Label Studio is a multi-type data labeling and annotation platform from HumanSignal. The Community Edition is open source and can be run locally, while Starter Cloud and Enterprise add hosted collaboration, access control, quality workflows, analytics, security, and support. Teams can configure labeling interfaces for text, images, audio, video, time series, and multimodal data, import tasks and predictions, connect machine-learning backends, and export annotations for model training and evaluation.

✨ Key Features

• Multi-type annotation — Label text, images, audio, video, time series, and multimodal tasks in configurable interfaces.
• Custom labeling configurations — Define project-specific controls, instructions, choices, relations, regions, and annotation workflows.
• Data Manager — Import, filter, sort, review, and manage datasets and annotation tasks.
• Prediction-assisted labeling — Connect an ML backend or prompts to pre-label tasks and let annotators correct the results.
• Human review workflows — Assign annotation and review roles, manage consensus, and inspect ground-truth data where supported.
• Cloud storage connectors — Work with local files and supported S3, GCS, Azure, and other storage integrations.
• Import and export — Bring in tasks and predictions and export annotations in formats such as JSON, COCO, and Pascal VOC.
• Project collaboration — Share projects, comments, notifications, and task access according to the edition.
• Quality control and analytics — Use agreement metrics, label distribution views, reviewer workflows, and performance dashboards on applicable plans.
• Enterprise identity and governance — Use organizations, workspaces, RBAC, SSO/LDAP, SCIM, audit logging, and granular permissions where available.
• Deployment flexibility — Run the open-source edition locally or use hosted cloud and supported on-premise/air-gapped enterprise deployments.
• Developer extensibility — Integrate through APIs, SDKs, webhooks, ML backends, and custom enterprise plugins.

💳 Pricing

• Community Edition — Free, open-source software under Apache 2.0, deployed on your own infrastructure. Hosted Cloud features are separate.
• Starter Cloud — The current official plan card lists $99/month for the base subscription and $49/month for each additional user, up to 12 users. A cloud trial is offered, with duration to be confirmed in the account.
• Enterprise — Custom pricing for advanced security, quality control, analytics and supported cloud or on-premise deployment.

The older support-forum quote of $149 base plus $99 per additional user is not the current public plan-card price. Confirm the selected seats and checkout total before subscribing.

⚖️ Alternatives Compared

🎯 Use Cases

• Computer vision datasets — Create image classification, detection, segmentation, and keypoint labels.
• NLP and LLM evaluation — Label text, conversations, preferences, and model responses for training or evaluation.
• Speech and audio data — Annotate transcripts, speakers, segments, or audio events.
• Video and time-series labeling — Mark events, objects, frames, or temporal intervals.
• Active-learning loops — Use model predictions to prioritize annotation and feed reviewed labels back into training.
• Quality review programs — Coordinate annotators and reviewers, measure agreement, and identify ground truth.
• Private or regulated data — Self-host the community edition or evaluate enterprise deployment and security controls.
• Managed labeling teams — Use cloud collaboration, roles, comments, notifications, and task management.
• ML pipeline integration — Connect storage, APIs, webhooks, and model backends to a repeatable labeling workflow.

Verify current features, pricing, licenses, privacy, storage, and deployment terms on the official product pages before relying on this listing.