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i18next vs. Locize

What is i18next?

i18next is a popular open-source JavaScript library for internationalization (i18n) and localization (l10n). It helps you:

  • Add multi-language support to web and mobile apps
  • Translate UI strings and handle pluralization
  • Format dates, numbers, and more for different locales
  • Integrate with frameworks like React, Vue, Angular, and more

What is Locize?

Locize is a cloud-based translation management system (TMS) that helps you:

  • Manage and organize translations for any software project
  • Collaborate with translators and reviewers in a dedicated UI
  • Deliver translations via CDN or API, instantly updating your app
  • Track versions, workflows, and translation progress

Did you know? The creators of i18next are also the founders of Locize. This ensures seamless integration, deep expertise, and ongoing innovation across both projects.

How do they work together?

i18next and Locize are designed to complement each other:

  • i18next handles the localization logic inside your app (loading translations, switching languages, formatting, etc.)
  • Locize manages the translation content, workflow, and delivery

You can use i18next-locize-backend to connect i18next directly to Locize, so your app always has the latest translations—no manual file updates needed.

Summary

  • i18next: The in-app engine for internationalization and localization
  • Locize: The cloud platform for managing, collaborating on, and delivering translations

Using both together gives you a powerful, scalable, and modern localization workflow for any project.