RectLabel

Spec sheet

Purpose

RectLabel is an offline image annotation tool for object detection and segmentation.Read 9 Oct 2026 · rectlabel.com

Support

The maker directs users to post problems to GitHub issues or email [email protected].Read 9 Oct 2026 · rectlabel.com

Headquarters

Tokyo, JapanRead 28 Sep 2026 · rectlabel.com

Founded

2017Read 28 Sep 2026 · rectlabel.com

Annotation types

The app supports polygons, pixels, bounding boxes, cubic Bezier curves, line segments, points, oriented bounding boxes, and skeleton keypoints.Read 9 Oct 2026 · rectlabel.com

Compatibility

The App Store listing says RectLabel requires macOS 13.5 or later and is for Mac only.Read 9 Oct 2026 · apps.apple.com

Data privacy

The maker's privacy policy says it does not collect images or annotation data.Read 9 Oct 2026 · rectlabel.com

Export formats

RectLabel exports to YOLO, COCO, CreateML, and DOTA, as well as indexed color and grayscale mask images.Read 9 Oct 2026 · rectlabel.com

Integration

For larger deployments, the maker recommends assigning app licenses to devices through Apple Business Manager managed licenses.Read 9 Oct 2026 · rectlabel.com

Maker history

Ryo Kawamura says he is an independent full-stack engineer from Tokyo and released RectLabel's first version in 2017.Read 9 Oct 2026 · rectlabel.com

Models

It supports polygon and pixel labeling with Segment Anything Model 2 and Cellpose, and automatic labeling with Core ML models including RF-DETR and YOLO26.Read 9 Oct 2026 · rectlabel.com

Network use

The maker says RectLabel Pro has no network connections because it has no in-app purchases.Read 9 Oct 2026 · rectlabel.com

OCR

The app provides automatic text recognition for lines and words.Read 9 Oct 2026 · rectlabel.com

SAM 3

Text and box prompts from Segment Anything Model 3 can label multiple objects at once.Read 9 Oct 2026 · rectlabel.com

Search and workflow

Users can configure objects, attributes, and hotkeys, search objects and image details in a gallery, convert video to image frames, and augment images.Read 9 Oct 2026 · rectlabel.com

Target users

The maker describes itself as building simple, intuitive tools for developers and says RectLabel is for annotating images for object detection and segmentation.Read 9 Oct 2026 · rectlabel.com

Plans and prices

Every RectLabel plan and price →

Where Specifiction places it

• Image Annotation Software#15 of 287.8
• AI Image Annotation Tools#14 of 247.7