Top Data Annotation Companies

Q: What do data annotation services include?

Data annotation services include guideline development, labeling of images, video, LiDAR, text or audio, quality review and delivery in your training format. Common tasks are bounding boxes, segmentation, keypoints, object tracking, entity tagging, sentiment and intent labels, transcription, and preference ranking or response writing for large language models.

Q: How much does data annotation cost?

Data annotation is priced per label, per item, per media minute, per task or per annotator hour. Annotation type, objects per item, domain expertise, review passes, security terms and turnaround drive the price. Most firms in this listing set a minimum project of $1,000 to $5,000, with others starting at $10,000 to $50,000.

Q: How do you evaluate the quality of a data annotation company?

Evaluate quality with a paid pilot on your own data, scored against a gold set your team labeled. Look at accuracy per class, agreement between annotators, how ambiguous items were escalated, and how fast the team absorbed guideline changes. Ask how quality is measured and reported on every later batch, not only the pilot.

Q: What is the difference between data annotation and content moderation?

Data annotation labels data so a model can learn from it; content moderation reviews live user content against a platform's policies. Both rely on trained human reviewers and detailed guidelines, but annotation output feeds a training pipeline, while moderation output removes, restricts or approves posts in real time. Some providers run both from the same delivery centers.

Q: How long does a data annotation project take?

The timeline depends on volume, annotation complexity and how settled the guideline is. Projects run through guideline drafting, a pilot batch, calibration, then production at the agreed throughput. Guideline changes mid-project, rare edge cases that need escalation, specialist labelers who are hard to staff and slow client review of pilot output are what extend it.

Q: Which industries use data annotation services?

Firms in this listing most often label data for information technology, business services, ecommerce, healthcare, financial services, retail and consumer products companies. Healthcare buyers need medical imaging labeled by clinicians under HIPAA terms; retailers and ecommerce teams label product images and search queries; financial services firms annotate documents for extraction and fraud models.

Q: Where are most data annotation companies located?

The largest groups of data annotation firms on this page are in Ahmedabad, London, Bengaluru, New York and Lahore, with New Delhi, Noida and Dubai close behind. Delivery centers in India and Pakistan supply large managed labeling teams, while London and New York firms often run project management and specialist or onshore labeling for regulated data.

A machine learning model is only as accurate as the labels it learns from. Data annotation services companies supply those labels at volume: boxes, polygons and masks on images, object tracking across video frames, 3D cuboids in LiDAR point clouds, entities and intents in text, transcripts and speaker turns in audio, and preference rankings and written responses for training large language models. AI teams outsource it when in-house labeling cannot keep up, when they need domain experts such as radiologists or linguists, or when a new model needs a large training set.

Compare data annotation providers here on the label types they have delivered at scale, how they measure quality, and where and how your data is handled.

How this list is built

We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

549 Companies

List of the Best Data Annotation Services Agencies

medDARE
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medDARE is based in Bucharest, Romania, and has been assisting healthcare companies globally since 2020 by improving machine learning algorithms and promoting AI-driven innovation. Our offerings include: Reasons Clients Prefer medDARE: Our clientele ranges from startups to Fortune 500 firms across t
Highlights
10-49
Employees
Bucuresti, Bucuresti, Ro
Services Provided
100% Data Annotation Services
AI Summary
“medDARE, based in Bucharest, enhances healthcare globally by advancing machine learning and AI innovation since 2020, serving diverse clients from startups to Fortune 500 companies.”
Pixel Annotation - Data Annotation Services
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Pixel Annotation is a specialized company focused on AI data annotation and labeling, providing highly accurate and precise training data for machine learning and computer vision applications. We assist AI-driven organizations in converting raw data into intelligence suitable for AI through scalable
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided
100% Data Annotation Services
AI Summary
“Pixel Annotation delivers precise, scalable data annotation services across image, video, text, and audio, supporting diverse industries with expert labeling to enhance AI and machine learning models.”
Uniquesdata
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Uniquesdata is a global outsourcing company specializing in data management, offering services such as data digitization, processing, conversion, analytics, scanning and indexing, as well as web research. Founded in 2009, our mission has been to provide customized solutions that facilitate smooth op
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided
100% Data Annotation Services
AI Summary
“Uniquesdata is a global outsourcing firm specializing in data management services like digitization and analytics, serving diverse sectors worldwide with customized, technology-driven solutions since 2009.”
Infosearch BPO Services Pvt. Ltd.
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Infosearch BPO is a global business outsourcing firm that specializes in various services, including annotation, data management, BPO, and call center solutions. With over 17 years of experience handling diverse projects, this ISO-certified company manages all assignments using trained in-house staf
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Chennai, Tamil Nadu, In
Services Provided
100% Data Annotation Services
AI Summary
“Infosearch BPO Services Pvt. Ltd. offers comprehensive global outsourcing solutions including data annotation, BPO, data management, and call center services, leveraging 17+ years of expertise with secure, in-house teams.”
Aeterna Data
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Aeterna Data, officially registered as PT Aeterna Data Intentio Logic, is an AI data annotation firm based in Indonesia that specializes in creating computer vision datasets and conducting visual RLHF evaluations for machine learning teams. The company assists AI startups and research laboratories b
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Bandung, West Java, Id
Services Provided
100% Data Annotation Services
AI Summary
“Aeterna Data is an Indonesian AI data annotation firm specializing in precise computer vision datasets and visual RLHF evaluations, emphasizing secure data handling and structured project execution.”
SunTec Data
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SunTec Data is a premier provider of data services, as well as a KPO and BPO/BPM firm. With over 25 years of experience and a workforce of more than 1,500 full-time employees, we have built successful collaborations with a wide range of global companies, including Honda, PepsiCo, Nielsen, Deloitte,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
1000-9999
Employees
Services Provided
100% Data Annotation Services
AI Summary
“SunTec Data, with 25+ years and 1,500+ employees, offers global clients comprehensive data services including entry, annotation, analytics, and management, ensuring quality, security, and timely delivery.”
Data Sphere Lab
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For rapid ML teams, the primary hurdle isn't the model training process—it's acquiring clean, precise, and dependable training data. We address this challenge. Our visual data annotation prioritizes quality to eliminate iterative cycles and speed up your journey to production. Our human-in-the-loop
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Krakow, Lesser Poland, Pl
Services Provided
100% Data Annotation Services
AI Summary
“Data Sphere Lab specializes in precise visual data annotation with a human-in-the-loop approach, delivering high-quality, secure training datasets across automotive, medtech, and industrial sectors.”
quantumlabel ai
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Quantum Label AI is a prominent provider of data annotation and AI training services committed to assisting businesses in improving their AI and machine learning models. We specialize in annotating images, videos, LiDAR, and audio, catering to various sectors including healthcare, robotics, automoti
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Dhaka, Dhaka, Bd
Services Provided
100% Data Annotation Services
AI Summary
“Quantum Label AI provides precise data annotation for images, videos, LiDAR, and audio across industries, enabling clients to enhance AI model performance with high-quality datasets and timely delivery.”
Hitech BPO
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Founded in 1992, Hitech BPO is a premier company in the field of business process outsourcing. We assist companies globally, including those in the USA, UK, and Canada, in maximizing the value of their data through our top-tier data annotation services. Why Choose Hitech BPO for Data Annotation? Mor
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
1000-9999
Employees
Ahmedabad, Gujarat, In
Services Provided
100% Data Annotation Services
AI Summary
“Founded in 1992, Hitech BPO is a global leader in business process outsourcing, specializing in comprehensive data annotation and management solutions to support AI and machine learning projects.”
Internet Research Bureau
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Internet Research Bureau (IRB) is an international data collection and market research firm that focuses on providing high-quality insights for B2B, B2C, and healthcare sectors. Established in 2011, IRB has earned a solid reputation for offering precise, trustworthy, and timely data to research agen
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Noida, Uttar Pradesh, In
Services Provided
100% Data Annotation Services
AI Summary
“Internet Research Bureau is a global market research firm providing precise, technology-driven data collection and insights for diverse sectors, specializing in niche, hard-to-reach professionals.”

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Buyer's guide

Hiring Data Annotation Services companies

What the work covers, how to judge a partner and what drives the price.

What data annotation companies deliver

Every project rests on a labeling guideline: the classes, edge cases and rules that tell annotators exactly what to mark. The provider drafts or refines it with your team, labels a pilot batch, calibrates annotators against a gold-standard set, then scales. Quality control uses multi-pass review, consensus labeling where several annotators label the same item, and agreement scores tracked per annotator and per class.

Work happens in the client's platform or the provider's: CVAT, Label Studio, Labelbox, Encord or a proprietary tool, with model-assisted pre-labeling to speed repetitive tasks. Output arrives in the format your training pipeline expects, such as COCO, YOLO, Pascal VOC or JSON lines.

Engagements are per-batch projects, ongoing managed teams that label a steady flow of production data, and specialist programs for LLM work: supervised fine-tuning prompts and responses, RLHF preference ranking, red-teaming and model evaluation. Some providers also collect raw data, such as recorded speech or photographed products, before labeling it.

Chapter 1 of 3

FAQ

Data Annotation Services FAQs

Short answers to what buyers ask before hiring a Data Annotation Services company.

Question not covered? Ask our team

Data annotation services include guideline development, labeling of images, video, LiDAR, text or audio, quality review and delivery in your training format. Common tasks are bounding boxes, segmentation, keypoints, object tracking, entity tagging, sentiment and intent labels, transcription, and preference ranking or response writing for large language models.

Data annotation is priced per label, per item, per media minute, per task or per annotator hour. Annotation type, objects per item, domain expertise, review passes, security terms and turnaround drive the price. Most firms in this listing set a minimum project of $1,000 to $5,000, with others starting at $10,000 to $50,000.

Evaluate quality with a paid pilot on your own data, scored against a gold set your team labeled. Look at accuracy per class, agreement between annotators, how ambiguous items were escalated, and how fast the team absorbed guideline changes. Ask how quality is measured and reported on every later batch, not only the pilot.

Data annotation labels data so a model can learn from it; content moderation reviews live user content against a platform's policies. Both rely on trained human reviewers and detailed guidelines, but annotation output feeds a training pipeline, while moderation output removes, restricts or approves posts in real time. Some providers run both from the same delivery centers.

The timeline depends on volume, annotation complexity and how settled the guideline is. Projects run through guideline drafting, a pilot batch, calibration, then production at the agreed throughput. Guideline changes mid-project, rare edge cases that need escalation, specialist labelers who are hard to staff and slow client review of pilot output are what extend it.

Firms in this listing most often label data for information technology, business services, ecommerce, healthcare, financial services, retail and consumer products companies. Healthcare buyers need medical imaging labeled by clinicians under HIPAA terms; retailers and ecommerce teams label product images and search queries; financial services firms annotate documents for extraction and fraud models.

The largest groups of data annotation firms on this page are in Ahmedabad, London, Bengaluru, New York and Lahore, with New Delhi, Noida and Dubai close behind. Delivery centers in India and Pakistan supply large managed labeling teams, while London and New York firms often run project management and specialist or onshore labeling for regulated data.

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Top Data Annotation Companies

List of the Best Data Annotation Services Agencies

Hiring Data Annotation Services companies

What data annotation companies deliver

How to choose a data annotation provider

Data annotation pricing and what drives the cost

Data Annotation Services FAQs

Latest insights & expert perspectives

Questions to Ask a Software Development Agency: Six With Proof

How to Compare Software Development Quotes Priced 5x Apart

AI Agent Development Cost: Build, Tokens, Reliability

One Platform. One Promise. One Trust.

Top Data Annotation Companies

List of the Best Data Annotation Services Agencies

Hiring Data Annotation Services companies

What data annotation companies deliver

How to choose a data annotation provider

Data annotation pricing and what drives the cost

Data Annotation Services FAQs

What do data annotation services include?

How much does data annotation cost?

How do you evaluate the quality of a data annotation company?

What is the difference between data annotation and content moderation?

How long does a data annotation project take?

Which industries use data annotation services?

Where are most data annotation companies located?

Where buyers look next

Latest insights & expert perspectives

Questions to Ask a Software Development Agency: Six With Proof

How to Compare Software Development Quotes Priced 5x Apart

AI Agent Development Cost: Build, Tokens, Reliability

One Platform. One Promise. One Trust.