COCO Annotation Inspector
Open a COCO annotations JSON with its images (folder, files or zip) and see boxes, polygon and RLE masks and keypoints on every image. Filter by category, size and crowd flag, get class and box-size statistics, find empty images, out-of-bounds boxes and other labelling mistakes, export a filtered subset, and score predictions with COCO AP plus per-class precision and recall. Free, runs in your browser, nothing is uploaded.
Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.