Home » Annotation Lab

The Free No-Code NLP Platform

Annotate Text & Images
AI Assisted Labeling
Train & Tune NLP Models
Test for Responsible AI
Manage Projects & Teams
Enterprise Security & Privacy

Install Software

Productivity

Build on the Spark NLP Models Hub to jump start projects with pre-annotations

Auto NLP

Active learning automatically trains & improves your model as you go

Teamwork

25+ Project types for annotating documents, images, audio, videos, or web pages

	Annotation Lab	LabelStudio	LabelBox	LightTag	TagTog	Prodigy
Who is the Free version for?	Teams looking for an enterprise-grade, proven, full-featured data labeling platform.	Used by individual data scientists and small annotation teams.	Small teams and individuals looking to test capabilities or validate early-stage experiments.	Individual users	Open: Only public labels & datasets.	No Free version available
Free edition limitations:	Unlimited Features Free Forever	Limited to a single organization and workspace	Limited to 10k annotations	Limited to single user & 500 labels/month	Limited to public datasets	No Free version available
Labeling Features:
Text labeling	Free	Free	Free	Free	Free	Paid
Image labeling	Free	Free	Free	N/A	N/A	Paid
Video labeling	Free	Free	Free	N/A	N/A	Paid
Audio labeling	Free	Free	N/A	N/A	N/A	Paid
Multi-lingual text labeling	Free	Free	N/A	Free	Team	Paid
Span annotations & overlapping entities	Free	Free	Free	Free	Free	Paid
Label relations & dependencies	Free	Free	Free	Free	Free	Paid
Projects & Teams:
Multiple projects	Free	Free	Free	Team	Free	Paid
Project grouping	Free	N/A	N/A	N/A	N/A	N/A
Project searching/filtering	Free	N/A	Free	N/A	N/A	N/A
Full API access	Free	Free	Pro	Team	Team	Paid
Task assignment	Free	Enterprise	Free	Team	Free	N/A
Task tagging	Free	N/A	N/A	Team	N/A	N/A
Task comments	Free	N/A	Free	N/A	N/A	N/A
Role based task status	Free	N/A	N/A	N/A	Free	N/A
Duplicate tasks detection	Free	N/A	N/A	N/A	N/A	N/A
Task searching/filtering	Free	Free	N/A	Team	Free	N/A
Guidelines	Free	Free	Free	Free	Team	N/A
Feedback & Comments on completions	Free	N/A	Free	N/A	N/A	N/A
Consensus Analysis/IA Agreement	Free	Enterprise	Pro	Team	Free	N/A
Quality review workflows	Free	Enterprise	Pro	Team	Team	Paid
Performance Dashboards	Free	Enterprise	Free	Team	Free	N/A
QA & collaboration	Free	Enterprise	Pro	N/A	N/A	N/A
AI-Assisted Text Labeling
Project configuration based on existing models and rules	Free	N/A	N/A	N/A	N/A	Paid
Rule editing interface	Free	N/A	N/A	N/A	N/A	N/A
Pre-annotations with model assisted labeling	Free	Support for 3rd party ML integration	Enterprise	Team	Enterprise	Paid
Active learning: auto-retrain models on the fly	Free	Enterprise, Support for 3rd party ML integration	N/A	N/A	Pro	Paid
Transfer learning: start from pre-trained models	Free	N/A	N/A	N/A	N/A	Paid
Bring your own models	Free	Support for 3rd party ML integration	Enterprise	Team	Free	Paid
Precision/Recall Reports for Trained Models	Free	N/A	N/A	N/A	N/A	Paid
Model Hub Integration	Free	N/A	N/A	N/A	N/A	N/A
Security & Privacy:
Role-based access controls	Free	Enterprise	Pro	Team	Enterprise	N/A
Role-based views	Free	Enterprise	N/A	Team	Enterprise	N/A
Annotation Versioning	Free	N/A	N/A	N/A	N/A	N/A
Full audit trail	Free	N/A	N/A	Enterprise	Enterprise	N/A
LDAP/AD integration - User import/Login	Free	Enterprise	Enterprise	Enterprise	Enterprise	N/A
Single Sign On - User import/Login	Free	Enterprise	Pro	Enterprise	Enterprise	N/A
On-Premise / Air-Gap Deployment	Free	Enterprise	Enterprise	Enterprise	Enterprise	Paid
Annotation on PDF and image documents:
Support for multi-page scanned or generated PDFs	OCR	N/A	N/A	N/A	Pro	N/A
Selectable PDFs	OCR	N/A	N/A	N/A	Pro	N/A
Scanned PDFs	OCR	N/A	N/A	N/A	N/A	N/A
Support for image annotation (png)	OCR	N/A	N/A	N/A	N/A	N/A
Text search in image documents	OCR	N/A	N/A	N/A	N/A	N/A
Multi line chunk annotations	OCR	N/A	N/A	N/A	N/A	N/A
Sticky token selection	OCR	N/A	N/A	N/A	N/A	N/A
Custom region annotation	OCR	N/A	N/A	N/A	N/A	N/A
Relations annotation	OCR	N/A	N/A	N/A	N/A	N/A
Zoom features	OCR	N/A	N/A	N/A	N/A	N/A
Healthcare features:
Pre-annotations with rules & regex	Healthcare	N/A	N/A	N/A	N/A	Paid
Pre-annotations with dictionaries	Healthcare	N/A	N/A	N/A	Team	Paid
Automatic detection of 100+ clinical and biomedical entities	Healthcare	N/A	N/A	N/A	N/A	N/A
Automatic detection of clinical assertion status detection (negation detection)	Healthcare	N/A	N/A	N/A	N/A	N/A
Automatic detection of 30+ healthcare-specific relation extraction	Healthcare	N/A	N/A	N/A	N/A	N/A
Automatic entity normalization (coding) to 10+ medical terminologies	Healthcare	N/A	N/A	N/A	N/A	N/A
Transfer learning for named entity recognition models	Healthcare	N/A	N/A	N/A	N/A	N/A
Ready to use healthcare-specific word, chunk, and sentence embeddings	Healthcare	N/A	N/A	N/A	N/A	N/A

Read more on how to choose the best text labeling tool for your needs here.

Productivity

Never start from scratch

Build on the Spark NLP Models Hub to jump start projects with pre-annotations
Reuse hundreds of pre-trained models – so that annotators don’t waste time on learned tasks
Automatically pre-annotate documents with over 100 clinical and biomedical entities

Keep Annotators in the Zone

Make the most of your domain experts’ time
Optimized screens, keyboard shortcuts, and automated task transitions
Write & share annotation guidelines

Reach agreement quickly

Optimized reviews: Visually compare versions across humans & models
Automated detection and live notifications of inconsistencies
Analytics for inter-annotator agreement, common confusion

Auto NLP

Active learning

Active learning automatically trains & improves your model as you go
Native integration with Spark NLP lets you use the model in custom, scalable pipelines

Deliver an accurate model, not just labels

Deliver a production-grade model, not just annotations: Train, version & publish models

Built for High Compliance Enterprise Environments

Deploy on your own cloud or on-premise infrastructure, share nothing
Full audit trail – versioned and per-user
Designed to handle PHI or PII

Teamwork

Projects & Teams

Manage multiple projects, teams, and roles
25+ Project types for annotating documents, images, audio, videos, or web pages
Text annotation: Entities, relationships, document classification, translation or summarization

Workflows

Customize annotation, validation, and review workflows to fit each project’s needs
Flexible filtering and search based on task name, user, and tag
Support human-in-the-loop production workflows that include both models & human review