Freedom251 › AI Image Annotation Tools
RectLabel
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 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, convert video into frames, and augment images. Exports include YOLO, COCO, CreateML, DOTA, CSV, mask images, and classification folders. The maker says it does not collect images or annotation data, and RectLabel Pro has no network connections. The App Store listing requires macOS 13.5 or later. RectLabel costs $9.99 a year after an untimed free trial; RectLabel Pro costs $19.99, paid once. The project began in 2017 and is based in Tokyo.
Who it suits
It suits developers preparing image datasets on a Mac, especially those needing varied annotation types, model-assisted labeling, and multiple export formats. It requires macOS 13.5 or later.
What it does well
- Works offline for image annotation
- Supports many annotation types
- Model-assisted labeling available
- Exports YOLO, COCO, CreateML, and DOTA
- Maker says images are not collected
What to know first
- Mac-only application
- Requires macOS 13.5 or later
- No free plan
- RectLabel Pro is a one-time paid license
Limits
The RectLabel trial is untimed, but a license is required for continued use. RectLabel Pro is a one-time paid plan; both listed plans provide all features.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| RectLabel Pro | One-time payment · no in-app purchases · all features | $19.99, paid once |
| RectLabel | Free trial is untimed · license required for continued use · all features | $299 a month |
| RectLabel | Free trial is untimed · license required for continued use · all features | $9.99 a year |
As rectlabel.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open rectlabel.com or the Mac App Store listing
- Install RectLabel on a Mac running macOS 13.5 or later
- Use the untimed free trial of the RectLabel plan
- Purchase a license for continued RectLabel use
- Choose RectLabel Pro for a one-time $19.99 as a one-time payment
- Configure objects, attributes, and hotkeys before annotating
Verdict
RectLabel provides broad annotation, model-assisted labeling, OCR, workflow tools, and dataset exports for Mac users. Its offline and privacy statements may matter to developers, while platform and licensing requirements limit who can use it.
Questions
What does RectLabel cost?
RectLabel is listed at $9.99/yr. RectLabel Pro costs $19.99, paid once as a one-time payment.
Is there a free trial?
Yes. The RectLabel free trial is untimed, but continued use requires a license.
Which operating systems are supported?
RectLabel is for Mac only and requires macOS 13.5 or later.
Does it collect annotation data?
The maker's privacy policy says it does not collect images or annotation data.
Which export formats are available?
Exports include YOLO, COCO JSON, Create ML JSON, DOTA, CSV, mask images, and classification folders.
Facts from RectLabel's own pages
- Annotation types
- The app supports polygons, pixels, bounding boxes, cubic Bezier curves, line segments, points, oriented bounding boxes, and skeleton keypoints. · rectlabel.com, 9 Oct 2026
- Compatibility
- The App Store listing says RectLabel requires macOS 13.5 or later and is for Mac only. · apps.apple.com, 9 Oct 2026
- Data privacy
- The maker's privacy policy says it does not collect images or annotation data. · rectlabel.com, 9 Oct 2026
- Export formats
- RectLabel exports to YOLO, COCO, CreateML, and DOTA, as well as indexed color and grayscale mask images. · rectlabel.com, 9 Oct 2026
- Founded
- 2017 · rectlabel.com, 28 Sept 2026
- Headquarters
- Tokyo, Japan · rectlabel.com, 28 Sept 2026
- Integration
- For larger deployments, the maker recommends assigning app licenses to devices through Apple Business Manager managed licenses. · rectlabel.com, 9 Oct 2026
- Maker history
- Ryo Kawamura says he is an independent full-stack engineer from Tokyo and released RectLabel's first version in 2017. · rectlabel.com, 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. · rectlabel.com, 9 Oct 2026
- Network use
- The maker says RectLabel Pro has no network connections because it has no in-app purchases. · rectlabel.com, 9 Oct 2026
- OCR
- The app provides automatic text recognition for lines and words. · rectlabel.com, 9 Oct 2026
- Purpose
- RectLabel is an offline image annotation tool for object detection and segmentation. · rectlabel.com, 9 Oct 2026
- SAM 3
- Text and box prompts from Segment Anything Model 3 can label multiple objects at once. · rectlabel.com, 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. · rectlabel.com, 9 Oct 2026
- Support
- The maker directs users to post problems to GitHub issues or email [email protected]. · rectlabel.com, 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. · rectlabel.com, 9 Oct 2026
Where RectLabel stands on Freedom251
- AI Image Annotation Tools#20 of 24
- Image Annotation Software#26 of 28