Prolific
prolific.com
#1
Research participant marketplace that gives AI teams and academics fast access to verified, screened human data and feedback.
#Data Analytics
verifiedPaid
Category · 42 tools verified
Best Data Labeling & Training Data Tools of 2026
All 42 Data Labeling & Training Data tools that are actually alive — cross-checked against multiple directories, liveness-verified, and ranked by real traffic. Dead links and clones removed. Verified means we checked — not that someone paid.
See the ranked list ↓42
TOOLS VERIFIED
17
FREE OPTIONS
12
WITH VIDEO REVIEWS
The ranked list
Showing 24 of 42 live tools · ranked by real traffic
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.
#Data Analytics
verifiedFree
Mercor
mercor.com
#3
Marketplace that matches vetted human experts with AI labs to produce training data and model evaluations.
#Data Analytics
verifiedFree
Zara
micro1.ai
#4
Data lab providing expert human data, RL environments, and contextual evaluations to train and assess AI models and agents.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
clickworker
clickworker.com
#5
Crowdsourcing platform using 8M+ global workers to deliver AI training data, labeling, surveys, testing and store checks.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
Appen
appen.com
#6
Long-standing provider of human-labeled, expert-validated training data and model evaluation services for building frontier AI.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
Labelbox
labelbox.com
#7
Data-labeling and RL data platform supplying training data, environments and evaluation for frontier AI labs and enterprises.
#Data Analytics
verifiedFreemium
OpenTrain AI
opentrain.ai
#8
Talent marketplace linking AI labs with 257,000+ vetted data labelers and trainers for RLHF, red-teaming and evaluation.
#Data Analytics
verifiedFreemium · from $9.95/mo
Super Annotate
superannotate.com
#9
Enterprise data-annotation and evaluation platform pairing a labeling tool with a managed expert annotator workforce.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
Wirestock
wirestock.io
#10
Marketplace pairing AI labs with ethically sourced, creator-made image and video datasets, alongside freelance content gigs.
#Data Analytics
verifiedPaid
encord.com
encord.com
#11
Data platform for computer-vision teams to build and deploy AI models; strong traffic.
#Data Analytics
verified—
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.
#Data Analytics
verifiedFreemium · from $99/mo
surgehq.ai
surgehq.ai
#13
Human-in-the-loop data platform providing expert labeling and feedback teams to train generative AI and language models.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
V7 Lab
v7labs.com
#14
V7 AI document processing and data-labeling platform for many industries; established ML-ops brand.
#Data Analytics
verified—
Innovatiana
innovatiana.com
#15
Human-in-the-loop data-labeling service that builds and annotates training datasets for AI models across 20+ industry sectors.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
SourceBae
sourcebae.com
#16
Marketplace connecting paid domain-expert contractors to AI labs for data labeling, RLHF and model evaluation work.
#Data Analytics
verifiedFree
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.
#Data Analytics
verifiedFreemium · from $25/mo
Your Personal AI
yourpersonalai.net
#18
European data-annotation and labeling vendor (YPAI) supplying GDPR/EU AI Act-compliant training data for regulated industries.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
Isahit
isahit.com
#19
Ethical managed-workforce platform for data labeling, RLHF, and LLM fine-tuning, with human-in-the-loop quality control.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedFreemium
DataVLab
datavlab.ai
#20
Data annotation and labeling services company delivering image, video, 3D, OCR and LLM-evaluation datasets for AI teams.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
Graviti
graviti.com
#21
Data platform for managing, versioning and curating unstructured ML datasets with Git-like collaboration.
#Data Analytics
verifiedFreemium
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.
#Data Analytics
verifiedFreemium · from $99/mo
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.
#Data Analytics
verifiedFreemium
Hasty
hasty.ai
#24
Former Hasty annotation tool, now CloudFactory's AI-assisted data labeling for computer-vision datasets.
#Data Analytics#Data Analytics__data Labeling Training Data__managed Annotation Services
verifiedPaid
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Data Labeling & Training Data tools compared
| Tool | Best for | Free tier | Price | Monthly visits |
|---|---|---|---|---|
| Prolific | Research participant marketplace that gives AI teams and academics fast access to verified, screened human data and feedback. | — | Paid | 21M |
| Outlier AI | Outlier is a platform where experts earn freelance income training and evaluating AI by writing prompts, rubrics and rating answers. | Yes | Free | 12M |
| Mercor | Marketplace that matches vetted human experts with AI labs to produce training data and model evaluations. | Yes | Free | 8.9M |
| Zara | Data lab providing expert human data, RL environments, and contextual evaluations to train and assess AI models and agents. | — | Paid | 6.3M |
| clickworker | Crowdsourcing platform using 8M+ global workers to deliver AI training data, labeling, surveys, testing and store checks. | — | Paid | 1.8M |
Verified by Toolspool