RectLabel
RectLabel is an offline macOS application for annotating images used in object detection and segmentation.
What RectLabel is
RectLabel is an offline macOS application for annotating images used in object detection and segmentation. It supports polygons, pixels, bounding boxes, cubic Bezier curves, line segments, points, oriented bounding boxes, and skeleton keypoints. Model-assisted labeling includes Segment Anything Model 3 text and box prompts, Segment Anything Model 2, Cellpose, and Core ML models such as RF-DETR and YOLO26. Automatic text recognition handles lines and words. Users can configure objects, attributes, and hotkeys, search image details in a gallery, turn video into image frames, and augment images. Exports include YOLO, COCO JSON, Create ML JSON, DOTA, CSV, mask images, and classification folders. The maker says images and annotation data are not collected, while RectLabel Pro has no network connections. RectLabel requires macOS 13.5 or later. RectLabel costs $9.99 a year after an untimed trial; Pro costs $19.99, paid once.
Good
- Many annotation shapes and keypoints
- Model-assisted labeling support
- Automatic text recognition
- Exports common dataset formats
- No image or annotation data collection stated
Watch out
- Mac only
- Requires macOS 13.5 or later
- No free plan
- Paid license required for continued use
Who it suits
RectLabel suits developers preparing image datasets on a Mac. It is aimed at object-detection and segmentation annotation workflows needing varied label types and exports.
Verdict
RectLabel offers extensive annotation methods, model assistance, and dataset export choices in an offline Mac workflow. Its platform requirement and paid licensing make operating-system and budget fit important.
Plans and prices
From RectLabel's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| RectLabel | $9.99 a year | Free trial is untimed · license required for continued use · all features |
| RectLabel Pro | $19.99, paid once | One-time payment · no in-app purchases · all features |
| RectLabel | $299 a month | Free trial is untimed · license required for continued use · all features |
The facts
Each one read from RectLabel's own pages, with the date it was checked.
What it does
- Annotation types
- The app supports polygons, pixels, bounding boxes, cubic Bezier curves, line segments, points, oriented bounding boxes, and skeleton keypoints.checked 9 Oct 2026
- Compatibility
- The App Store listing says RectLabel requires macOS 13.5 or later and is for Mac only.checked 9 Oct 2026
- Data privacy
- The maker's privacy policy says it does not collect images or annotation data.checked 9 Oct 2026
- Export formats
- RectLabel exports to YOLO, COCO, CreateML, and DOTA, as well as indexed color and grayscale mask images.checked 9 Oct 2026
- Integration
- For larger deployments, the maker recommends assigning app licenses to devices through Apple Business Manager managed licenses.checked 9 Oct 2026
- 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.checked 9 Oct 2026
- Network use
- The maker says RectLabel Pro has no network connections because it has no in-app purchases.checked 9 Oct 2026
- OCR
- The app provides automatic text recognition for lines and words.checked 9 Oct 2026
- Purpose
- RectLabel is an offline image annotation tool for object detection and segmentation.checked 9 Oct 2026
- SAM 3
- Text and box prompts from Segment Anything Model 3 can label multiple objects at once.checked 9 Oct 2026
- 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.checked 9 Oct 2026
- Support
- The maker directs users to post problems to GitHub issues or email [email protected].checked 9 Oct 2026
- 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.checked 9 Oct 2026
The company
- Founded
- 2017checked 28 Sep 2026
- Headquarters
- Tokyo, Japanchecked 28 Sep 2026
- Maker history
- Ryo Kawamura says he is an independent full-stack engineer from Tokyo and released RectLabel's first version in 2017.checked 9 Oct 2026
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