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Top 20 Python Annotation Projects
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cleanlab
The standard data-centric AI package for data quality and machine learning with messy, real-world data and labels.
Project mention: Ask HN: Not a webdev, why are these sites so good? | news.ycombinator.com | 2024-06-18https://cleanlab.ai/
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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> Does Hypothes.is have a self-hosting option? https://web.hypothes.is/sales/
The code for both the client and server are open source (https://github.com/hypothesis/h) so this is possible. The server is designed to support the needs of large scale deployments, so this does come with some complexity compared to a system you would design for smaller scale usage.
The text on https://web.hypothes.is/ mostly targets schools and universities, because Hypothesis pays for itself by selling integrations with online learning platforms (Canvas, D2L, Blackboard etc.) and associated support.
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diffgram
The AI Datastore for Schemas, BLOBs, and Predictions. Use with your apps or integrate built-in Human Supervision, Data Workflow, and UI Catalog to get the most value out of your AI Data.
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errant
ERRor ANnotation Toolkit: Automatically extract and classify grammatical errors in parallel original and corrected sentences.
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SaaSHub
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globox
A package to read and convert object detection datasets (COCO, YOLO, PascalVOC, LabelMe, CVAT, OpenImage, ...) and evaluate them with COCO and PascalVOC metrics.
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reconstruction-error-ratios
Estimate dataset difficulty and detect label mistakes using reconstruction error ratios!
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Python Annotation discussion
Python Annotation related posts
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Ann, the Small Annotation Server
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Given the rise of LLMs, is a toolkit like ERRANT still relevant?
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Google Sidewiki
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Label Studio: Open-Source Data Labeling Platform
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Best (quickest) way to annotate images for whole-image classification?
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Label Studio – Free multi-type data ML labeling and annotation tool
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Way to label yolov7 images fast
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A note from our sponsor - SaaSHub
www.saashub.com | 18 Jun 2025
Index
What are some of the best open-source Annotation projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | cleanlab | 10,588 |
| 2 | h | 3,041 |
| 3 | diffgram | 1,867 |
| 4 | labelCloud | 690 |
| 5 | bakta | 519 |
| 6 | errant | 444 |
| 7 | bbox-visualizer | 401 |
| 8 | atlas | 392 |
| 9 | grasp | 361 |
| 10 | DLTA-AI | 344 |
| 11 | spectree | 336 |
| 12 | globox | 200 |
| 13 | turkle | 152 |
| 14 | labelbox-python | 138 |
| 15 | image-sorter2 | 91 |
| 16 | ansible-docgen | 75 |
| 17 | labelformat | 62 |
| 18 | reconstruction-error-ratios | 25 |
| 19 | vogon-web | 13 |
| 20 | active-learning-plugin | 12 |
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