language_tool_python
Checks grammar using LanguageTool.
Decision gist · record as of 2026-08-14
Yes, with a licensing caveat. The package is well-maintained, has low install friction, no known vulnerabilities, and provides a mature interface to a powerful grammar checker. However, its GPL-3.0-only license means you cannot use it in proprietary or closed-source projects without a separate commercial license. For open-source or internal tools, it is a solid choice.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Java >= 17 required for the default local LanguageTool server (6.8); Java >= 9 for older versions.
- Python >= 3.9.
- Low install friction with a pure-Python wheel.
License · maintenance · safety
GPL-3.0-only (copyleft) — Licensed under GPL-3.0-only (copyleft). Any software that links or distributes this package must also be released under GPL-3.0 or compatible terms; proprietary or closed-source projects cannot use it without a separate license agreement.
last release 2026-05-14 (92 days) · last repo commit 2026-08-01 · 529 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 347,561 downloads/mo, #7,348 on PyPI
Alternatives
Verify before relying
pip install language_tool_python
import language_tool_python
with language_tool_python.LanguageTool("en-US") as tool:
matches = tool.check("This are bad.")
print(tool.correct("This are bad."))- Performance characteristics when checking large documents or high-frequency API calls.
- Accuracy of grammar and spelling detection across different languages and domains.
- Latency and resource overhead of running a local Java server versus using the public API.
What it is and what it does
language_tool_python is a Python interface to LanguageTool, an open-source grammar, style, and spell checker. It lets you run grammar checks from Python code or the command line, with three deployment options: a local LanguageTool Java server (default version 6.8), the public LanguageTool API, or your own remote server. The wrapper handles server lifecycle, text checking, auto-correction, and fine-grained rule/category control.
The package depends on requests for HTTP calls, tqdm for progress feedback, packaging for version handling, psutil for system monitoring, and toml for configuration. It supports Python 3.9 through 3.14 and offers both programmatic and CLI interfaces, making it suitable for batch text processing, integration into larger NLP pipelines, or standalone grammar validation tools.
Use it for
- Batch-check documents or code comments for grammar and spelling errors in an automated pipeline.
- Build a CLI tool or web service that validates user-submitted text against grammar and style rules.
- Integrate grammar checking into a documentation generator or content management system.
- Detect and correct typos and grammatical issues in multilingual text with configurable language rules.
- Develop domain-specific spell-checkers by registering custom spellings and disabling irrelevant rules.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, with a licensing caveat.
The package is well-maintained, has low install friction, no known vulnerabilities, and provides a mature interface to a powerful grammar checker. However, its GPL-3.0-only license means you cannot use it in proprietary or closed-source projects without a separate commercial license. For open-source or internal tools, it is a solid choice.
Install
language-tool-python on PyPI
Before you install
Low install friction with a pure-Python wheel. Maintenance is active with a recent release (92 days ago) and steady repository activity. Runtime dependencies are lightweight and widely used (requests, tqdm, packaging, psutil, toml).
Java >= 17 required for the default local LanguageTool server (6.8); Java >= 9 for older versions. Python >= 3.9.
License in practice
Licensed under GPL-3.0-only (copyleft). Any software that links or distributes this package must also be released under GPL-3.0 or compatible terms; proprietary or closed-source projects cannot use it without a separate license agreement.
Quickstart
pip install language_tool_python
import language_tool_python
with language_tool_python.LanguageTool("en-US") as tool:
matches = tool.check("This are bad.")
print(tool.correct("This are bad."))Verify before relying
- Performance characteristics when checking large documents or high-frequency API calls.
- Accuracy of grammar and spelling detection across different languages and domains.
- Latency and resource overhead of running a local Java server versus using the public API.
Package facts
| License | GPL-3.0-only copyleft |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 5 packagesrequeststqdmpackagingpsutiltoml |
| Maintenance | Actively maintained 92 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 347,561 / month, #7,348 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Operating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python ModulesTopic :: Text Processing :: Linguistic |
Evidence: language_tool_python-3.4.0-py3-none-any.whl
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See also pyenchant · pyspellchecker · typos · pyspelling · sphinxcontrib-spelling · codespell · symspellpy · vale · mkdocs-spellcheck · Parsley