Guided scenario
Data labeling & annotation
Model quality starts with labeled data, and labeling by hand at scale is slow and expensive. This shortlist ranks annotation platforms by coverage: model-assisted labeling, video and text support, and an optional managed workforce, with open-source and self-hosting as secondary signals. Pricing is mostly quote-based or per unit, so also weigh quality-control workflows, data-security terms, and export formats.
CVAT
www.cvat.ai
CVAT (Computer Vision Annotation Tool) is an open-source data annotation platform for images, video, and 3D point clouds, originally developed at Intel and now maintained by CVAT.ai.
Encord
encord.com
Encord is a data platform for computer-vision and multimodal AI covering annotation, data curation, and dataset indexing across images, video, audio, documents, DICOM medical imaging, and 3D point clouds.
HumanSignal
humansignal.com
HumanSignal (formerly Heartex) is the company behind Label Studio, the widely used open-source data-labeling tool supporting images, video, audio, text, and documents in one interface.
Kili Technology
kili-technology.com
Kili Technology is a Paris-based data labeling and evaluation platform, founded in 2018, for building the training and fine-tuning datasets behind AI models.
Labelbox
labelbox.com
Labelbox is a data-labeling platform for images, video, text, and documents: annotation tooling, model-assisted labeling, data curation via its Catalog, and an optional managed labeling workforce through its services arm.
Roboflow
roboflow.com
Roboflow is a computer-vision platform whose Annotate product labels image datasets with AI-assisted tools, alongside dataset management, augmentation, model training, and deployment.
Scale AI
scale.com
Scale AI provides training-data services and software: annotation of images, video, text, and sensor data through a managed human workforce combined with model-assisted pre-labeling, plus RLHF and evaluation data for generative models.
SuperAnnotate
www.superannotate.com
SuperAnnotate is an annotation platform for images, video, text, and LLM training data, combining annotation tooling and quality-management workflows with a marketplace of vetted labeling-service teams.
V7
www.v7labs.com
V7 is a vision-first AI data platform: its Darwin product handles image and video annotation with model-assisted auto-labeling, and V7 Go extends the platform to document and multimodal workflows.