Offers a high-quality pool of verified human participants for research and preference tuning, but is less focused on traditional data annotation.

clickworker records 1,861,149 monthly visits with +0.5% month-over-month growth and Contact for Pricing pricing. Ultralytics records 793,423 monthly visits with +8.7% growth and Freemium pricing.

Real-time vision AI models and a full platform to train, annotate, and deploy them
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | clickworker.com | ultralytics.com |
| Pricing Model | Contact for Pricing | Freemium |
| Monthly Visits | 1.86M (1,861,149) | 793.42K (793,423) |
| MoM Traffic Delta |
|---|
| +9.57K (+0.5%) |
| +63.49K (+8.7%) |
| Primary Market & Share | 🇺🇸 United States (27.6%) | 🇨🇳 China (15.2%) |
|---|
| Direct Visits / mo | 947.13K | 239.75K |
|---|
| User Rating | 3.9 | 4.6 |
|---|
| Supported Platforms | Website | Website |
|---|

Crowdsourcing data services for AI training and market data
Custom image, video, audio and text datasets with human labeling, annotation and validation, delivered with parent company LXT.
Registered freelancers in 136 countries fill microtasks through web, Android and iOS apps, with flexible scaling up or down.
An all-in-one survey tool plus access to a verified respondent pool for external studies and targeted insights.
Real-time point-of-sale data collection, display audits, mystery checks, and usability testing for websites, apps and games.

Real-time vision AI models and a full platform to train, annotate, and deploy them
One model family covering detection, instance segmentation, pose estimation, oriented boxes, classification, and tracking, tuned for real-time inference on GPU, CPU, and edge devices.
Label data with SAM-assisted annotation, train on cloud GPUs with AutoTrain, and deploy to managed regions that scale to zero when idle.
Ship trained models to ONNX, TensorRT, CoreML, TFLite, and many other formats for cloud servers, mobile devices, and embedded hardware.
Adopt the open-source AGPL-3.0 release, or purchase an enterprise license to embed YOLO in closed-source products without copyleft obligations.
Offers a high-quality pool of verified human participants for research and preference tuning, but is less focused on traditional data annotation.


Connects subject matter experts for advanced LLM training and prompting, but lacks general microtask crowdsourcing capabilities.
#2
Specializes in matching AI labs with vetted human experts for RLHF, but offers fewer general data annotation services.
Free / Open-sourceProvides an all-in-one ecosystem for dataset annotation, model training, and edge deployment.

SpecialistEnterprise-grade labeling and data curation platform for complex computer vision training pipelines.

Provides enterprise-grade data annotation and training datasets at scale, but with a more corporate engagement model.

Focuses on elite domain experts for complex RLHF and frontier AI evaluation, but lacks casual crowdsourcing tasks.
SpecialistProvides advanced multimodal dataset curation and annotation tools specifically for computer vision teams.

Free / Open-sourceOpen-source self-hosted NVR optimized for running real-time local object detection on security feeds.


Free / Open-sourceOpen-source labeling tool with extensible support for custom computer vision annotation tasks.

SpecialistSpecializes in dataset curation, visualization, and quality evaluation for computer vision workflows.

SpecialistFocuses on prompt-based rapid assembly of end-to-end enterprise computer vision applications.
Offers a high-quality pool of verified human participants for research and preference tuning, but is less focused on traditional data annotation.
Connects subject matter experts for advanced LLM training and prompting, but lacks general microtask crowdsourcing capabilities.
Specializes in matching AI labs with vetted human experts for RLHF, but offers fewer general data annotation services.
Free / Open-sourceProvides an all-in-one ecosystem for dataset annotation, model training, and edge deployment.
SpecialistEnterprise-grade labeling and data curation platform for complex computer vision training pipelines.
Focuses on elite domain experts for complex RLHF and frontier AI evaluation, but lacks casual crowdsourcing tasks.
SpecialistProvides advanced multimodal dataset curation and annotation tools specifically for computer vision teams.
Free / Open-sourceOpen-source self-hosted NVR optimized for running real-time local object detection on security feeds.
Free / Open-sourceOpen-source labeling tool with extensible support for custom computer vision annotation tasks.
SpecialistSpecializes in dataset curation, visualization, and quality evaluation for computer vision workflows.
SpecialistFocuses on prompt-based rapid assembly of end-to-end enterprise computer vision applications.