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Listed Sydney-based provider of AI training data, RLHF, speech and multimodal data, with the ADAP platform and a global contributor network.
Label Studio overview and key facts (October 2026)
Open-source labeling tool for text, images, audio, video and agent traces, with commercial cloud and enterprise editions from HumanSignal.
Free
from $99 per month
What is Label Studio?
Label Studio is an open-source data labeling tool for ML and AI teams that annotate text, images, audio, video and agent traces. HumanSignal, which maintains it, sells cloud and enterprise editions with automation and evaluation features.
The Community Edition is licensed under Apache 2.0 and had about 28,400 GitHub stars with commits on September 28, 2026. Labeling interfaces are configured per project and cover classification, bounding boxes, transcription, ranking and comparison of model outputs. Starter Cloud adds hosting, role-based access and quality workflows for up to 12 users. Enterprise adds SSO via SAML or LDAP, LLM auto-labeling, LLM-as-a-judge evaluation, SOC 2 and HIPAA compliance and optional on-premises deployment.
Label Studio AI features and use cases
- Pre-labels data with your own modelAn ML backend connects a model that proposes labels as tasks load. Annotators confirm or fix predictions, which cuts repetitive work on large datasets.
- Compares and ranks model outputsConfigurable interfaces let reviewers rank or compare responses from language models. Teams collect preference data for fine-tuning or check answer quality.
- Automates evaluation with human oversightIn the Enterprise edition, an LLM judges outputs and people review the results. Evaluation teams scale checks while keeping a person in the loop for doubtful cases.
What sets Label Studio apart
- Apache 2.0 Community Edition with configurable labeling interfaces for nearly any data type.
- Covers classic labeling and LLM work such as ranking responses and reviewing agent traces.
Where Label Studio is strongest
Available internationally
Label Studio is an open-source project used worldwide that can be self-hosted or used as a cloud service.
Questions to ask before you buy Label Studio
The Community Edition has no compliance reporting and must be operated, updated and secured by your own team. Starter Cloud includes only limited LLM pre-labeling; SSO, full LLM-as-a-judge evaluation and on-premises deployment are Enterprise features. For the cloud editions, clarify hosting region and data processing terms before labeling personal data.
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Questions about Label Studio
Is Label Studio free?
Yes. The Community Edition is open source under the Apache 2.0 license. Starter Cloud costs $99 per month plus $49 per additional user.
Which features need Enterprise?
SSO with SAML or LDAP, full LLM-as-a-judge evaluation and SOC 2 and HIPAA compliant deployment in the cloud or on-premises. Starter Cloud offers LLM pre-labeling only in limited form.
Who maintains Label Studio?
HumanSignal maintains the open-source project on GitHub and sells the commercial editions.
Label Studio update historyno updates yet
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Changes the vendor made and confirmed user reports, each checked against the vendor's own pages. We review every tool monthly.
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