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#2 LabelImg
Open‑source graphical image annotation tool that creates Pascal VOC and YOLO format XML/ TXT files. Simple UI, cross‑platform.
Web‑based, open‑source annotation suite from Intel, supporting bounding boxes, polygons, 3D cuboids, and collaborative projects.
#4 Labelbox
Enterprise SaaS platform offering scalable annotation workflows, quality control, and model‑in‑the‑loop review with API integration.
AI‑assisted annotation suite with smart tools for segmentation, classification, and object detection; includes model training loop.
#6 MakeSense.ai
Free, browser‑based annotation tool supporting multiple export formats (COCO, YOLO, VOC) and collaborative labeling.
Managed data labeling service with human‑in‑the‑loop quality checks and API for large‑scale image and video annotation.
#8 Supervisely
Full‑stack platform for image/video annotation, dataset management, and model training; includes automation bots.
Microsoft’s open‑source desktop app for labeling images and videos, exporting to TensorFlow, YOLO, and other formats.
#10 Diffgram
Open‑source data labeling platform with workflow automation, versioning, and integration with ML pipelines.
#11 Dataturks
Web‑based annotation tool for text, image, and video; offers free tier and paid plans with team collaboration.
#12 Label Studio
Highly configurable open‑source data labeling tool supporting image, audio, text, and time‑series data with custom labeling schemas.
#13 Prodigy
Python‑centric, active‑learning annotation tool from Explosion AI; fast UI for image classification, bounding boxes, and segmentation.
#14 RectLabel
macOS native app for drawing bounding boxes, polygons, and masks; exports to COCO, YOLO, and TensorFlow formats.
#15 Sloth
Open‑source, lightweight annotation tool written in Python/Qt; supports bounding boxes, polygons, and keypoints.
#16 Annotorious
JavaScript library for embedding image annotation directly into web pages; supports rectangles, polygons, and free‑hand drawing.
#17 DeepLabel
AI‑powered annotation platform offering auto‑segmentation suggestions and collaborative review for large image datasets.
AWS managed labeling service that combines human workers with active learning to produce high‑quality training data.
Offline version of Supervisely with advanced annotation tools, model inference, and dataset version control.
#20 Pixie
Browser‑based annotation platform focused on quick bounding‑box labeling with team permissions and export to COCO/YOLO.
#21 V7 Darwin
Annotation SaaS with AI‑assisted labeling, dataset versioning, and integration pipelines for computer‑vision projects.