Annotation Tools Companies

HumanSignal

San Francisco, United States

HumanSignal develops Label Studio, a fully-configurable, open-source data labeling platform designed for complex data types including audio, video, and timeseries data. Their technology focuses on enabling high-quality, human-in-the-loop annotation with customizable UIs, workflow orchestration, and traceable oversight for compliant AI development. HumanSignal serves both enterprise clients seeking to embed unique data into AI systems and frontier AI labs requiring novel datasets, offering both a self-serve platform and managed services for dataset creation and annotation.