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Sudachi — segment Japanese at multiple granularities with POS tagging and normalization

OSS scale score 179.7OSS health 78Update pace 23 commits/30d
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Stars
1,011
Primary language
Java
License
Apache-2.0
Repository last updated
Sep 18, 2026

Overview

Sudachi is a Japanese morphological analyzer that combines segmentation, part-of-speech tagging, and normalization, with A/B/C segmentation modes, Sudachi dictionaries, user dictionaries, and plugins.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Switch among A/B/C segmentation granularities

Text can be segmented from short UniDic-like units through longer entity-oriented units depending on the use case.

Sources: [2]

Combine POS tagging, normalization, user dictionaries, and plugins

Sudachi provides part-of-speech information, normalization, custom dictionaries, and extensible input/OOV/path processing.

Sources: [2][3]

For Japanese search and NLP that needs controllable token granularity

It fits full-text search, entity extraction, and business-document processing where segmentation choices materially affect recall and precision.

Sources: [2]

Pin v0.8 releases and migrate dictionaries carefully

The README calls v0.8.* unstable and warns of patch-level breaking changes. v0.8.2 changes dictionary format and requires rebuilding user dictionaries against the exact system dictionary.

Sources: [2][4]

Official sources

  1. [1]WorksApplications/Sudachi repository(2026-09-21)
  2. [2]Sudachi README(2026-09-21)
  3. [3]Sudachi tutorial(2026-09-21)
  4. [4]Sudachi v0.8 migration guide(2026-09-21)
  5. [5]Sudachi Apache-2.0 license(2026-09-21)
Supplemental curator note

Sudachi goes beyond tokenization by combining segmentation, POS tagging, and normalization. The current README labels v0.8.* unstable and warns that patch releases may include breaking changes, recommending exact version pinning. v0.8.2 also introduces a new dictionary binary format that requires system/user-dictionary migration.

Try it in 3 steps

  1. 1

    Get the source

    git clone --depth 1 https://github.com/WorksApplications/Sudachi.git
  2. 2

    Enter the repository

    cd Sudachi
  3. 3

    Check the official steps

    Continue with the commands in the README Installation, Quick Start, or Getting Started section.

    find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Check the official README

Growth

Growth trends · Last 30 days

1,011 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
23
Open PRs
1

Development activity is still being collected.

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Categories

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GitHub data

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GitHub Topics

  • morphological-analysis
  • segmentation
  • nlp-library
  • pos-tagging
Stars
1,011
Forks
80
Watchers
43
Open issues
15
Contributors
24
Primary language
Java
License
Apache-2.0
Repository last updated
Sep 18, 2026
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