Data annotation companies by modality

Which annotation companies label images?

17 of 18 vendors list image work. Image work is the most widely offered: boxes, polygons, keypoints and segmentation masks. Price depends on shape and density, so a mask costs far more than a box.

Ask every image vendor

• Which shapes are priced per object, and which per image?
• Is model pre-labeling used, and is it charged?

Which annotation companies label text and documents?

16 of 18 vendors list text work. Text covers classification, entity and span tagging, extraction from documents, and more and more rating of LLM output. Language coverage is often the deciding factor.

Ask every text vendor

• Which languages, and are annotators native speakers?
• Do raters for LLM output need subject expertise, and how is it checked?

Which annotation companies label 3D point clouds and sensor data?

7 of 18 vendors list 3d and sensor work. LiDAR cuboids, point-cloud segmentation and camera-LiDAR fusion are specialist work, used most in autonomy and robotics. Fewer vendors offer it, and tooling matters a lot.

Ask every 3d and sensor vendor

• Can LiDAR and camera frames be labeled together, in which coordinate frame?
• Are cuboids tracked across sequences, and how is that priced?