Humans in the Loop vs Scale AI: Which Data Labeling tool is Best in 2025?

All these tools Humans in the Loop , Scale AI offer flexible pricing models suitable for machine learning engineers, data scientists seeking AI-powered solutions to enhance their Data Labeling efforts.

Humans in the Loop

Starting from
Custom

Scale AI

Starting from
Custom

These AI tools are among the best Data Labeling tools available in 2025. For machine learning engineers, data scientists, tools like Humans in the Loop , Scale AI help streamline the Data Labeling process by offering AI-powered features.

What is Humans in the Loop?

Humans in the Loop specialize in dataset collection, annotation, real-time edge case handling, and reinforcement learning with human feedback. They also offer annotation services, including bounding box annotation, polygon annotation, keypoint annotation, semantic segmentation, and 3D annotation. They specialize in industries such as geospatial, automotive, medical, industrial, agricultural, and retail.

What is Scale AI?

Scale AI helps AI technology-based development companies accelerate the development of AI products. Scale AI is responsible for providing high-quality training data for different kinds of AI applications, such as generative AI, self-driving cars, mapping, AR/VR, robotics. Scale AI provides two main product lines: the Scale Data Engine and the Scale Generative AI platform. The scale data engine improves the quality and efficiency of AI applications. It has features like image annotation, semantic segmentation, and LIDAR/RADAR annotation. The scale data engine provides tools for collecting, labeling, managing, and evaluating data for various AI projects. The Scale Generative AI platform helps organizations customize and use large language models (LLMs).

Humans in the Loop
(4.7/5)
  • Accuracy and Reliability:
    4.9
  • Cost-Efficiency:
    4.8
  • Customization and Flexibility:
    4.8
  • Data Privacy and Security:
    4.7
  • Ease of Use:
    4.6
  • Functionality and Features:
    4.8
  • Integration Capabilities:
    4.9
  • Performance and Speed:
    4.5
  • Support and Resources:
    4.4
Scale AI
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Scale AI

Pros

The Scale AI platform's interface is user-friendly.

Top Efficiency and Speed.

Cons

Limited transparency in pricing.

Some users find the user interface (UI) needs improvement.

Not ideal for all project types.

If you're looking for other Data Labeling tools for machine learning engineers, data scientists, you can also explore Alaya AI, Labelbox, which are highly rated in 2025.

Humans in the Loop
  • Humans in the Loop
  • Sofia City
Scale AI
  • Scale AI
  • San Francisco, California, U.S