Top 10 Data Annotation Companies for AI/ML Development in 2026

AI/ML model development depends on the availability of large, accurately labeled training datasets. When annotation workflows lack scale, consistency, or domain expertise, organizations face immediate operational challenges: stalled training pipelines, degraded model accuracy, and increased costs across the development lifecycle.

Most companies struggle to build in-house annotation teams due to the cost of recruiting specialized talent, the time required to train teams for complex data types, and the difficulty of sustaining multi-layer quality assurance at scale. Professional data annotation providers address these constraints by combining domain-trained annotators, established QA processes, and proficiency in industry-leading annotation tools.

In this blog, we’ve identified the top 10 data annotation service providers recognized for their operational workflows, domain specialization, and proven impact on enterprise AI initiatives.

Top 10 Data Annotation Companies

1. SunTec.ai

Established in 1999, SunTec.ai is a global AI/ML development company providing AI & data annotation services to support enterprise machine-learning initiatives across diverse industries. With a team of over 850 data and AI specialists, the company has delivered 1,500+ projects.

As part of its data annotation services, the company leverages a human-in-the-loop (HITL) approach that blends automation for large-scale throughput with manual validation for edge-case handling and precision. SunTec.ai provides end-to-end labeling for image, video, text, audio, and 3D/point-cloud datasets. The annotators use techniques such as 2D and 3D bounding boxes, polygons, semantic and instance segmentation, keypoint and landmark tagging, cuboids, LiDAR/point cloud labeling, frame-by-frame video tracking, document tagging, entity extraction, and audio/speech tagging.

SunTec.ai leverages top annotation platforms across 2D, 3D, and multimodal data, including Labelbox, SuperAnnotate AI, and CVAT, integrating them into annotation workflows.

The company is ISO 9001:2015 certified for quality management systems, ISO/IEC 27001:2022 certified for information security management systems, and complies with HIPAA and GDPR standards for secure, compliant data handling.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Audio Annotation
• Text Annotation

Case Study
Learn how SunTec.ai enhanced accuracy by 25% with image annotation services.

Notable Clients: Line, Expedia, CrowdWorks

Pricing Model: Custom Pricing

Dedicated Project Manager: Yes

2. Data-Entry-India.com

Founded in 1999, Data-Entry-India.com is a data and business-process outsourcing company offering a comprehensive range of services, including data entry, data processing, data annotation, and eCommerce catalog management. With a team of more than 850 full-time professionals, the company has served 3,850+ clients globally.

Data-Entry-India.com is one of the top data annotation companies, offering human-in-the-loop labeling for text, images, and video. Its AI data annotation workflows are powered by industry-leading tools such as CVAT, LabelImg, Light Tag, Prodigy, and TagTog, enabling efficient and scalable labeling across both simple and complex datasets.

The company serves diverse industries — including retail and eCommerce, healthcare, real estate, finance, logistics, and technology. For quality and data security, Data-Entry-India.com is  ISO 9001:2015 certified for quality management systems and ISO/IEC 27001:2022 certified for information security management systems.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Text Annotation

Case Study
Learn how Data-Entry-India.com achieved 100% accuracy with text annotation services.

Notable Clients: Jaquar, Pepsico, Byju’s

Pricing Model: Custom Pricing

Dedicated Project Manager: Yes

3. SunTec Data

Established in 1999, SunTec Data is a global data services company specializing in data cleansing, enrichment, transformation, catalog management, and data annotation for AI and machine learning initiatives. With more than 1,500 full-time professionals, the company supports enterprises across retail and eCommerce, real estate, healthcare, publishing, manufacturing, logistics, BFSI, and technology.

As part of its data annotation capabilities, SunTec Data provides human-in-the-loop labeling across image, text, video, and 3D datasets. The specialized annotators leverage annotation techniques such as bounding boxes, polygons, semantic segmentation, OCR tagging, entity extraction, and sentiment tagging to build high-quality training datasets for computer vision, NLP, and automation workflows.

With 120+ specialized annotators skilled in industry-leading tools—such as Labelbox, CVAT, Annotation Labs, and LabelImg, proprietary platforms—SunTec Data efficiently manages complex, scalable labeling workflows.

The company is ISO 9001:2015 certified for quality management systems, ISO/IEC 27001:2022 certified for information security management systems, and HIPAA-compliant for sensitive healthcare data.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Text Annotation

Case Study
Learn how SunTec Data enhanced accuracy by 30% with video annotation services.

Notable Clients: Network 18, Deloitte, Pearson

Pricing Model: Project-Based

Dedicated Project Manager: Yes

4. DataEntryIndia.in

Established in 1999, DataEntryIndia.in is a global data management and outsourcing company specializing in data annotation, data entry, data processing, and digital transformation support for AI and enterprise operations. With over 850 data experts and a delivery record of 1,200+ projects, the company serves clients across retail and eCommerce, healthcare, automotive, finance, real estate, logistics, and technology sectors.

As a part of its data annotation services, DataEntryIndia.in provides human-in-the-loop labeling for text, image, and video datasets. Its annotation capabilities span sentiment tagging, OCR tagging, entity extraction, semantic labeling, image-object detection, bounding boxes, semantic segmentation, keypoint and landmark annotation, video object tracking, and frame-by-frame labeling. The company also prepares AI/ML-ready datasets for natural language processing, computer vision, and generative AI applications.

DataEntryIndia.in’s data annotation practice is supported by modern tools, including CVAT, Label Studio, Labelbox, LabelImg, Darwin, and Annotation Labs, enabling scalable, high-precision annotation workflows adaptable to proprietary platforms as well.

For quality and data security, the company is ISO 9001:2015 certified for quality management and ISO/IEC 27001:2022 certified for information security, and complies with HIPAA and GDPR guidelines for regulated industries.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Text Annotation

Case Study
Learn how DataEntryIndia.in enhanced the object detection accuracy of an AI/ML system by 45% with image annotation services.

Notable Clients: JumpStart, Bose, Panasonic

Pricing Model: Custom Pricing

Dedicated Project Manager: Yes

5. SunTec India

Founded in 1999, SunTec India is a global business outsourcing company. With a workforce of more than 1,500 full-time professionals, the company serves 8,530+ clients across diverse industries, including retail and eCommerce, healthcare, finance, logistics, real estate, publishing, and technology.

As part of its data annotation services, SunTec India offers human-in-the-loop annotation for text, images, video, and document-based datasets. Their domain-specific annotators use a range of advanced annotation techniques, including semantic text tagging, named entity recognition, sentiment labeling, bounding-box annotation, point-cloud/LiDAR labeling, and object tracking.

SunTec India’s data annotation workflows integrate domain experts, multi-level QA, edge-case handling, bias mitigation, and continuous quality validation — ensuring accurate, context-rich training datasets. Their annotation workflows incorporate multi-stage quality checks to create reliable ground-truth datasets for machine learning models. SunTec India’s annotation workflows are supported by secure, enterprise-ready platforms including CVAT, Label Studio, Labelbox, LabelImg, and purpose-built internal systems, enabling reliable, scalable data labeling for AI applications.

SunTec India is ISO 9001:2015 certified for quality management systems and ISO/IEC 27001:2022 certified for information security management systems. The company is HIPAA-compliant, ensuring secure handling of healthcare data.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Text Annotation

Case Study
Learn how SunTec India reduced overhead costs by 30% by preparing a high-quality training dataset of 3,000 images.

Notable Clients: Dentsu, Oxford University Press, Bajaj Finserv

Pricing Model: Project-Based

Dedicated Project Manager: Yes

6. Mindy Support

Established in 2013, Mindy Support is a global outsourcing company specializing in data annotation and customer service solutions. As a part of its data annotation services, the company provides human-in-the-loop labeling for image, video, text, and audio data. With a workforce of more than 2,000 employees, Mindy Support has delivered 1300+ annotation projects.

Its annotation specialists work with techniques such as 2D and 3D bounding boxes, polygons, semantic segmentation, labeling, and point and landmark annotations to generate high-quality training data for computer vision, natural language processing, and speech-recognition models.  These capabilities support AI use cases across industries, including automotive, eCommerce, healthcare, finance, telecom, geospatial, travel and hospitality, and IT/SaaS. The company is ISO 9001:2015 certified for quality management systems, ISO 27001:2022 certified for information security management systems, and complies with GDPR, CCPA, and HIPAA regulatory frameworks.

Core Data Annotation Services

• Image Processing/Annotation
• Text Annotation
• Video Annotation
• 3D Point Cloud Annotation

Case Study:
Learn how Mindy Support delivered high-quality text annotation across 5,000 pages.

Notable Clients: Contxtful, Anyline, Voiceitt

Pricing Model: Custom Quote

Dedicated Project Manager: Yes

7. TranscribeMe

Established in 2011, TranscribeMe is a global transcription and AI training data provider offering transcription, translation, custom AI datasets, and data annotation services. With 50+ employees, the company serves more than 2500 clients. As part of its annotation services for machine learning, TranscribeMe uses techniques such as sentiment analysis, relationship tagging, quantitative research coding, semantic annotation, named-entity recognition, data labeling and classification, and bounding-box annotation. The high-quality training datasets are used to train speech recognition, NLP, and computer vision models for chatbots and virtual assistants, contact-center analytics, and other AI applications.

TranscribeMe serves diverse industries such as technology, medical, education, consulting, market research, and enterprise call centers. The company complies with CCPA, HIPAA, and GDPR regulations.

Core Data Annotation Services

• Image Annotation
• Text Annotation
• Video Annotation
• Speech & Audio Annotation

Case Study
N/A

Notable Clients: Kaplan, Genesys, Cisco

Pricing Model: Project-Based

Dedicated Project Manager: Yes

8. Sama

Founded in 2008, Sama is a global AI-training data and annotation services provider specializing in human-in-the-loop labeling, dataset creation, and model validation for complex machine learning workflows.

As a data annotation service provider, the company offers image annotation (bounding boxes, polygons, segmentation, keypoints, cuboids), video and frame-by-frame annotation, 3D/sensor/point-cloud/LiDAR data annotation, and multimodal annotation workflows that integrate visual and sensor data. Sama’s services provide high-quality training datasets for computer vision, autonomous vehicle perception, robotics, sensor fusion, and generative AI models across industries such as automotive/ADAS, robotics, retail & e-commerce, agriculture, manufacturing, consumer technology, and media.

The company is ISO 9001 certified for quality management and ISO 27001 certified for information security. Sama complies with GDPR and CCPA requirements, supported by secure, role-based access.

Core Data Annotation Services

• Image Annotation
• Video Annotation

Case Study
Learn how Sama helped Swift cut annotation rejections by 66.7% between week 1 and week 10.

Notable Clients: Swift, Siemens, Qualcomm

Pricing Model: Custom Pricing

Dedicated Project Manager: Yes

9. LXT

Established in 2010, LXT is a global AI training data company specializing in data annotation, data collection, and transcription services for enterprise AI programs. With more than 500 employees, the company offers data services in 1000+ languages. LXT is one of the top data annotation companies, providing labeling services for image, video, audio, text, and 3D/point-cloud datasets.

Their annotators use techniques such as 2D and 3D bounding boxes, polygons, semantic segmentation, keypoint and landmark annotation, LiDAR and point cloud labeling, entity tagging, sentiment annotation, and audio transcription with linguistic markup. These capabilities enable enterprises to build high-quality training datasets for computer vision, natural language processing, speech recognition, autonomous systems, robotics, and multimodal AI applications. The company is ISO 27001 certified for information security management and maintains GDPR and CCPA compliance across its data-processing workflows.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Audio Annotation
• Text Annotation

Case Study
Learn how LXT collected, transcribed, and annotated multilingual speech data—supporting 20 languages and delivering 2× faster than the timeline.

Notable Clients: MakeOpinion, Sensory, Speechly

Pricing Model: Project-Based

Dedicated Project Manager: Yes

10. Kotwel

Founded in 2021, Kotwel is a global AI training-data and outsourcing services provider offering data annotation, collection, validation, and linguistic services to enterprises worldwide.

Kotwel is one of the best data annotation companies, offering image annotation (bounding boxes, polygons, segmentation, keypoint/landmark annotation), video annotation (frame-by-frame labeling, object tracking), audio/speech annotation, text annotation, and complete data-labeling workflows. Kotwel serves diverse industries, including automotive/ADAS, healthcare, agriculture, IT & software, entertainment, retail/e-commerce, and education.

Core Data Annotation Services

• Image Annotation
• Video Annotation
• Audio Annotation
• Text Annotation

Case Study
N/A

Notable Clients: N/A

Pricing Model: Custom Pricing

Dedicated Project Manager: Yes

How to Choose the Right Data Annotation Service Provider?

• Quality and Accuracy: Look for providers offering high accuracy rates with robust quality assurance processes, including multi-tier validation, inter-annotator agreement scoring, and expert review mechanisms.
• Scalability and Flexibility: Assess the provider’s ability to handle your current volume requirements while scaling rapidly to accommodate growth, with flexible engagement models that align with your budget and timeline.
• Security and Compliance: Prioritize partners with ISO certifications and relevant industry-specific compliance standards (e.g., HIPAA for healthcare, GDPR for European operations), especially when handling sensitive or regulated data.
• Domain Expertise: Choose providers with subject matter experts and proven experience in your specific industry, ensuring annotators understand the nuances and requirements of your use cases.
• Technical Expertise: Evaluate the provider’s use of AI-assisted annotation tools, automation capabilities, and platform integrations that can accelerate delivery without compromising quality.