compare-locales
Lint Mozilla localizations
Decision gist · record as of 2026-08-14
Yes, if you maintain Mozilla localizations or similar multi-language projects. The tool is actively maintained, has no known vulnerabilities, and low install friction. The copyleft license is standard for Mozilla tooling; verify it aligns with your project's licensing model before use.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires an l10n.toml configuration file in your project; see moz-l10n-config documentation for format details.
- Low install friction with a pure-Python wheel distribution.
- Actively maintained as of May 2026, with recent commits and production-stable status.
License · maintenance · safety
MPL-2.0 (copyleft) — Mozilla Public License 2.0 (copyleft) requires that modifications and derivative works remain under MPL-2.0; suitable for internal tooling and open-source projects but check your licensing requirements if distributing modified versions.
last release 2026-05-30 (76 days) · last repo commit 2026-05-29 · 5 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 81,727 downloads/mo, #14,206 on PyPI
Alternatives
Verify before relying
pip install compare-locales
compare-locales l10n.toml .
moz-l10n-lint l10n.toml- Whether fluent.syntax, six, and toml are bundled or require separate installation in your environment.
- Performance characteristics when linting large localization projects with many locales.
What it is and what it does
compare-locales is a command-line linter and merge tool for Mozilla localization workflows. It validates localization files against a reference (typically English) to detect missing strings, obsolete entries, and runtime errors without false positives, while also warning on potential issues. The package includes two main tools: compare-locales for validating locales across a project, and moz-l10n-lint for checking local work and detecting string conflicts.
The tool is configured via an l10n.toml project file and works with Mozilla's localization structure. It can merge localizations by padding them with missing English strings and replacing error-prone entities with English fallbacks, making it essential for maintaining consistency across multiple language variants in large projects.
Use it for
- Validate all locales in a Mozilla project against a reference configuration to catch missing or obsolete strings before release.
- Lint local localization work before committing to detect errors and conflicts in string definitions.
- Merge localizations with English fallbacks to ensure no untranslated strings break the application at runtime.
- Check for conflicts between locally-defined strings and those already exposed to the l10n community.
- Integrate into CI/CD pipelines to enforce localization quality standards across monolithic and gecko-based projects.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you maintain Mozilla localizations or similar multi-language projects.
The tool is actively maintained, has no known vulnerabilities, and low install friction. The copyleft license is standard for Mozilla tooling; verify it aligns with your project's licensing model before use.
Install
compare-locales on PyPI
Before you install
Low install friction with a pure-Python wheel distribution. Actively maintained as of May 2026, with recent commits and production-stable status.
Requires an l10n.toml configuration file in your project; see moz-l10n-config documentation for format details.
License in practice
Mozilla Public License 2.0 (copyleft) requires that modifications and derivative works remain under MPL-2.0; suitable for internal tooling and open-source projects but check your licensing requirements if distributing modified versions.
Quickstart
pip install compare-locales
compare-locales l10n.toml .
moz-l10n-lint l10n.tomlVerify before relying
- Whether fluent.syntax, six, and toml are bundled or require separate installation in your environment.
- Performance characteristics when linting large localization projects with many locales.
Package facts
| License | MPL-2.0 copyleft |
| Python support | Supports the current Python release <4,>=3.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packagesfluent.syntaxsixtoml |
| Maintenance | Actively maintained 76 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 81,727 / month, #14,206 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)Operating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python ModulesTopic :: Software Development :: LocalizationTopic :: Software Development :: Testing |
Evidence: compare_locales-9.0.5-py3-none-any.whl
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