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Making text annotation easier, faster and better 

LANN - Literate ANNotation - is a tool designed for efficient, high-quality text annotation, built by a group of professional NLPers.Originally used as an in-house tool, it combines a smooth workflow for team work and automatic assistance from AI all the way through. It supports corpus annotation for information extraction tasks, including Named Entity Recognition and Relation Extraction.
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LANN Powered by Melax Technologies

With LANN's automated workflow, text annotation becomes more accurate and cost effective, and team work more productive. AI smooths processes while supporting information extraction tasks including Named Entity Recognition and Relation Extraction.

Explore LANN's Uses
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LANN Powered by Melax Technologies

Explore LANN's Uses
Quality control

Team collaboration
AI assistance
Cloud service
Quality control
Team collaboration
AI assistance     
Cloud service           

Unleash your team's creativity with a new generation of annotation tools!

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Save Time 
  • Take advantage of dictionaries and machine learning methods for smart, automatic, pre-annotation
  • Support pre-annotation model training with existing annotation files
  • Improve pre-annotation models with real-time online learning
  • Effortlessly develop relation annotations with a few clicks
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Automate workflow
  • Edit annotation guidelines, record annotation questions (with screenshot support), and update resolved questions in real time
  • Automatic index of semantic types
  • Dynamic search of semantic types during annotation
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Support multiple resources
  • Utilize multiple annotation formats from existing tools such as prodigy, MAI, brat, etc.
  • Easily annotate text and pdf files
  • Upload or import text from any database table
  • Automatically create annotation schema of entities and relations by reading from annotated text
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Support multiple resources 
  • Utilize multiple annotation formats from existing tools such as prodigy, MAI, brat, etc.
  • Easily annotate text and pdf files
  • Upload or import text from any database table
  • Automatically create annotation schema of entities and relations by reading from annotated text
Instant communication
  • Email admin/annotators with proposed/resolved questions
  • Email annotators with assigned tasks, and deleted/rejected annotations
  • Email admin with quality control progress
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Manage your team
Record progress of projects
Record progress of annotators
Check qualification statistics
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Manage team
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  • Record progress of projects
  • Record progress of annotators
  • Check qualification statistics
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Control quality
  • Check between multiple users with an inter-annotator agreement (IAA)
  • Calculate IAA scores automatically (F-measure and Cohen Kappa)
Control quality
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  • Check between multiple users with an inter-annotator agreement (IAA)
  • Calculate IAA scores automatically (F-measure and Cohen Kappa)
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  • Review submitted annotations
  • Resolve annotation discrepancy
  • Reject annotations with low quality
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  • Review submitted annotations
  • Resolve annotation discrepancy
  • Reject annotations with low quality

Various application scenarios

Identify · Extract · Integrate
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Precision medicine
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Patient cohort matching
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Clinical chart review
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Quality measurement
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Drug repurposing
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Knowledge base construction
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Phenotyping algorithm
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Real world evidence