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LangDex is a universal linguistic database that provides comprehensive linguistic data for over 5,700 languages. Built on authoritative sources like Glottolog, PanLex, and Wiktionary, LangDex serves as a unified platform for language learning, translation, and linguistic research.

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What is LangDex?

LangDex aggregates and harmonizes linguistic data from multiple authoritative sources into a single, queryable database:
  • 15+ million lexemes with definitions, pronunciations, and etymologies
  • 100+ million word forms with full morphological analysis
  • Cross-lingual meanings via PanLex semantic hub
  • 7,000+ language varieties from Glottolog taxonomy

Quickstart

Get up and running with the LangDex API in minutes

Core Concepts

Understand how LangDex organizes linguistic data

API Reference

Complete API documentation with examples

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Use Cases

LangDex is designed for three primary use cases:

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Language Learning

Build vocabulary apps with SRS flashcards, access example sentences from Tatoeba, and leverage proficiency standards like JLPT and HSK.

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Translation APIs

Access translations between any language pair through the PanLex meaning network, with sense-level granularity for accurate results.

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Linguistic Research

Query morphological paradigms, phonological inventories, etymological relationships, and cognate sets across language families.

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Data Sources

LangDex integrates data from leading open linguistic resources:
SourceData TypeCoverage
GlottologLanguage taxonomy7,000+ languoids
PanLexCross-lingual meanings2M+ meanings
Kaikki/WiktionaryDictionaries23GB, 200+ languages
UniMorphMorphology150+ languages
PHOIBLEPhoneme inventories3,000+ inventories
TatoebaExample sentences10M+ sentences
WordNetSynsets120K+ synsets

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Architecture Overview

                          +------------------+
                          |     MEANING      |
                          |    (PanLex)      |
                          +--------+---------+
                                   |
          +------------------------+------------------------+
          |                        |                        |
    +-----v-----+           +------v------+          +------v------+
    |  LANGUAGE |           |   LEXEME    |          |   SENSE     |
    | (Glottolog)|          |             |          |  meaning_id |
    +-----------+           +-------------+          +-------------+
LangDex uses a meaning-centric architecture where PanLex meanings serve as the universal semantic hub, connecting lexemes across all 5,700+ languages.

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Getting Started

1

Get an API Key

Sign up at langdex.co/dashboard to get your API key
2

Make Your First Request

Try a simple language lookup to verify your setup
3

Explore the Data

Query lexemes, translations, and linguistic features
Ready to dive in? Head to the Quickstart guide to make your first API call.