# AI tools for “Data annotation” 71 matching tools; showing 24, ranked by relevance. Filters: `group=coding-development` | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Why it matched | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [SuperAnnotate](https://openaitools.app/tool/super-annotate) | 386,034 | +37.4% | Free Trial, Contact for Pricing | AI data infrastructure for building production-grade models | keywords 100%; semantic match | [.md](https://openaitools.app/tool/super-annotate.md) | | 2 | [clickworker](https://openaitools.app/tool/clickworker-com) | 1,861,149 | +0.5% | Contact for Pricing | Crowdsourcing data services for AI training and market data | keywords 100%; semantic match | [.md](https://openaitools.app/tool/clickworker-com.md) | | 3 | [Appen](https://openaitools.app/tool/appen-com) | 665,840 | +0.2% | Contact for Pricing | Human-validated training data and evaluation services for frontier AI models | keywords 100%; semantic match | [.md](https://openaitools.app/tool/appen-com.md) | | 4 | [Encord](https://openaitools.app/tool/encord-com) | 244,204 | +9.4% | Contact for Pricing | The multimodal data layer for computer vision and physical AI teams | keywords 100%; semantic match | [.md](https://openaitools.app/tool/encord-com.md) | | 5 | [Roboflow](https://openaitools.app/tool/roboflow) | 1,431,204 | +6.6% | Freemium, Contact for Pricing | Build, train, and deploy computer vision for the physical world | keywords 100%; semantic match | [.md](https://openaitools.app/tool/roboflow.md) | | 6 | [Label Studio](https://openaitools.app/tool/label-studio) | 137,199 | -16.1% | Contact for Pricing, Free | Label any data. Evaluate any AI. | keywords 100%; semantic match | [.md](https://openaitools.app/tool/label-studio.md) | | 7 | [Labelbox](https://openaitools.app/tool/labelbox) | 762,803 | -22.8% | Contact for Pricing | The environments frontier AI trains on, and the agents that do the recurring work | keywords 100%; semantic match | [.md](https://openaitools.app/tool/labelbox.md) | | 8 | [BasicAI Cloud](https://openaitools.app/tool/basicai-cloud) | 21,670 | -13.1% | Freemium, Enterprise Quote | AI data annotation platform and managed labeling services for AI training data | keywords 100%; semantic match | [.md](https://openaitools.app/tool/basicai-cloud.md) | | 9 | [Voxel51](https://openaitools.app/tool/voxel51-com) | 117,715 | -8.2% | Contact for Pricing | Find where your physical AI models fail, then fix the data. | keywords 100%; semantic match | [.md](https://openaitools.app/tool/voxel51-com.md) | | 10 | [Prolific](https://openaitools.app/tool/prolific-com) | 18,697,671 | -1.8% | Paid | High-quality human data for AI training, evaluation, and research | semantic match | [.md](https://openaitools.app/tool/prolific-com.md) | | 11 | [Isahit](https://openaitools.app/tool/isahit) | 13,136 | +80.2% | Contact for Pricing | Ethical human-in-the-loop data labeling and AI validation | keywords 100%; semantic match | [.md](https://openaitools.app/tool/isahit.md) | | 12 | [Unitlab](https://openaitools.app/tool/unitlab-ai) | 3,903 | -36.4% | Freemium, Contact for Pricing | Curate, annotate and QA multimodal training data in one governed workspace | keywords 100%; semantic match | [.md](https://openaitools.app/tool/unitlab-ai.md) | | 13 | [T-Rex Label](https://openaitools.app/tool/t-rex-label) | 9,900 | +37.6% | Free | Browser-based AI data labeling that turns one box into a whole annotated dataset | keywords 100%; semantic match | [.md](https://openaitools.app/tool/t-rex-label.md) | | 14 | [People for AI](https://openaitools.app/tool/people-for-ai) | 992 | -12.7% | Contact for Pricing | Human-annotated training data for computer vision and NLP | keywords 100%; semantic match | [.md](https://openaitools.app/tool/people-for-ai.md) | | 15 | [Outlier AI](https://openaitools.app/tool/outlier-ai) | 10,372,036 | +7.6% | Paid | Get paid to train the next generation of AI models | semantic match | [.md](https://openaitools.app/tool/outlier-ai.md) | | 16 | [FlyPix AI](https://openaitools.app/tool/flypix) | 86,419 | +14.6% | Freemium, Free Trial, Paid | AI agents that detect, monitor and inspect anything you can see from the sky | keywords 100% | [.md](https://openaitools.app/tool/flypix.md) | | 17 | [LightPDF](https://openaitools.app/tool/lightpdf-com) | 1,742,568 | -15.3% | Freemium | Free AI-powered PDF editor, converter and reader for every device | keywords 100% | [.md](https://openaitools.app/tool/lightpdf-com.md) | | 18 | [Datature](https://openaitools.app/tool/datature) | 24,530 | -23.2% | Freemium, Paid, Contact for Pricing | The all-in-one computer vision platform for labeling, training and deploying vision AI | keywords 74%; semantic match | [.md](https://openaitools.app/tool/datature.md) | | 19 | [Pangeanic](https://openaitools.app/tool/pangeanic-com) | 32,787 | -9.9% | Contact for Pricing | Multilingual AI data, model alignment, and sovereign AI systems for enterprises and labs | keywords 100%; semantic match | [.md](https://openaitools.app/tool/pangeanic-com.md) | | 20 | [Ultralytics](https://openaitools.app/tool/ultralytics) | 793,423 | +8.7% | Freemium | Real-time vision AI models and a full platform to train, annotate, and deploy them | keywords 74% | [.md](https://openaitools.app/tool/ultralytics.md) | | 21 | [Markup: Document Annotation](https://openaitools.app/tool/markup-document-annotation) | 263 | -17.8% | Free | Turn free text into structured, model-ready data with AI-assisted annotation. | keywords 100%; semantic match | [.md](https://openaitools.app/tool/markup-document-annotation.md) | | 22 | [Epigos AI](https://openaitools.app/tool/epigos-ai) | 1,560 | +3.3% | Freemium, Paid | End-to-end computer vision platform for annotating, training and deploying custom models | keywords 100%; semantic match | [.md](https://openaitools.app/tool/epigos-ai.md) | | 23 | [MD.ai](https://openaitools.app/tool/md-ai) | 6,650 | -11.2% | Contact for Pricing | AI-powered radiology reporting and DICOM-native medical imaging annotation | keywords 100%; semantic match | [.md](https://openaitools.app/tool/md-ai.md) | | 24 | [Surge AI](https://openaitools.app/tool/surgehq-ai) | 245,142 | +6.6% | Contact for Pricing | Expert human data and evaluation for training frontier AI | semantic match | [.md](https://openaitools.app/tool/surgehq-ai.md) | Page 1 of 3 · [Next page →](https://openaitools.app/index.md?q=Data+annotation&group=coding-development&page=2) For programmatic access use `https://openaitools.app/api/tools?q=…` or MCP `https://openaitools.app/api/mcp`. --- Source: https://openaitools.app/?q=Data%20annotation More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)