Lingo.dev

Lingo.dev is a set of open source localization engineering tools that keep translations moving at the speed of the code. Rather than exporting strings and waiting on a vendor, the tools run in the terminal and in the pipeline where the content changes.

They connect to localization engines, stateful translation APIs that persist glossaries, brand voice and per-locale instructions across every request. The command line tool can also drive your own model from OpenAI, Anthropic, Google, Mistral, OpenRouter or Ollama if you would rather own that part.

Five tools share the same engines and cover different points in a project.

• CLI: localizes JSON, YAML, markdown, CSV and PO files, with a lockfile so only new or changed content is processed.
• GitHub Action: continuous localization for GitHub Actions, GitLab CI/CD and Bitbucket Pipelines, filling missing strings before code ships.
• MCP server: gives AI assistants framework-specific i18n knowledge for Next.js, React Router and TanStack Start.
• API: calls an engine from backend code with async jobs, webhook delivery and per-locale failure isolation.
• React compiler: an early alpha that finds translatable text at build time, with no keys, JSON files or t functions.

The repository is a pnpm and turborepo monorepo, and every pull request carries a changeset. Its own README is maintained in nearly thirty languages, which is a fair demonstration of the workflow the tools are selling.