Best AI Data Labeling & Training Data Tools of 2026

Prolific

prolific.com

#1

Research participant marketplace that gives AI teams and academics fast access to verified, screened human data and feedback.

Outlier AI

outlier.ai

#2

Outlier is a platform where experts earn freelance income training and evaluating AI by writing prompts, rubrics and rating answers.

Mercor

mercor.com

#3

Marketplace that matches vetted human experts with AI labs to produce training data and model evaluations.

Zara

micro1.ai

#4

Data lab providing expert human data, RL environments, and contextual evaluations to train and assess AI models and agents.

clickworker

clickworker.com

#5

Crowdsourcing platform using 8M+ global workers to deliver AI training data, labeling, surveys, testing and store checks.

Appen

appen.com

#6

Long-standing provider of human-labeled, expert-validated training data and model evaluation services for building frontier AI.

Labelbox

labelbox.com

#7

Data-labeling and RL data platform supplying training data, environments and evaluation for frontier AI labs and enterprises.

OpenTrain AI

opentrain.ai

#8

Talent marketplace linking AI labs with 257,000+ vetted data labelers and trainers for RLHF, red-teaming and evaluation.

Super Annotate

superannotate.com

#9

Enterprise data-annotation and evaluation platform pairing a labeling tool with a managed expert annotator workforce.

Wirestock

wirestock.io

#10

Marketplace pairing AI labs with ethically sourced, creator-made image and video datasets, alongside freelance content gigs.

encord.com

encord.com

#11

Data platform for computer-vision teams to build and deploy AI models; strong traffic.

Label Studio

labelstud.io

#12

Open-source data-labeling and AI-evaluation platform for image, text, audio, video and LLM workflows, with a paid enterprise tier.

surgehq.ai

surgehq.ai

#13

Human-in-the-loop data platform providing expert labeling and feedback teams to train generative AI and language models.

V7 Lab

v7labs.com

#14

V7 AI document processing and data-labeling platform for many industries; established ML-ops brand.

Innovatiana

innovatiana.com

#15

Human-in-the-loop data-labeling service that builds and annotates training datasets for AI models across 20+ industry sectors.

SourceBae

sourcebae.com

#16

Marketplace connecting paid domain-expert contractors to AI labs for data labeling, RLHF and model evaluation work.

Inflectiv.ai

inflectiv.ai

#17

Marketplace that turns raw files into structured, tokenized datasets AI agents can query via API, sold on a credits model.

Your Personal AI

yourpersonalai.net

#18

European data-annotation and labeling vendor (YPAI) supplying GDPR/EU AI Act-compliant training data for regulated industries.

Isahit

isahit.com

#19

Ethical managed-workforce platform for data labeling, RLHF, and LLM fine-tuning, with human-in-the-loop quality control.

DataVLab

datavlab.ai

#20

Data annotation and labeling services company delivering image, video, 3D, OCR and LLM-evaluation datasets for AI teams.

Graviti

graviti.com

#21

Data platform for managing, versioning and curating unstructured ML datasets with Git-like collaboration.

Unitlab AI

unitlab.ai

#22

Multimodal data annotation and dataset management platform for AI teams to label image, video, audio, text, and DICOM data at scale.

T-Rex Label

trexlabel.com

#23

Browser-based zero-shot labeling tool for CV teams needing fast bounding-box and segmentation annotation without fine-tuning.

Hasty

hasty.ai

#24

Former Hasty annotation tool, now CloudFactory's AI-assisted data labeling for computer-vision datasets.