Lingo.dev is the localization engineering platform: the best way to measure translation quality, translate with LLMs, and proofread with native speakers.

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Teams build localization engines on Lingo.dev

A localization engine is a stateful translation API your team configures and Lingo.dev runs. Build one per product, per content type, or per brand. Every request through an engine applies everything you configured in it, in a fixed order of precedence:

Glossaries, rulesets, and brand voices belong to your organization, and an engine applies them by attachment. One glossary governs five engines, and one edit reaches all five. Test a change in the Playground before it goes live: compare an engine against a raw model, or two engines side by side. The engines are configured on the platform, where the localization team runs the localization infrastructure.

Reach your engines from code

Translate the content in a repository. lingo push sends the files to the engine named in .lingo/config.json, and lingo pull writes the translations back from any machine:

npm install -g @lingo.dev/cli
lingo init && lingo link
lingo push

Or call an engine directly, naming it by ID:

const res = await fetch("https://api.lingo.dev/process/localize", {
  method: "POST",
  headers: { "X-API-Key": process.env.LINGO_API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    engineId: "eng_abc123",
    sourceLocale: "en",
    targetLocale: "de",
    data: { greeting: "Hello, world!", cta: "Get started" },
  }),
});

const { data, model, usage } = await res.json();
// data:  { greeting: "Hallo, Welt!", cta: "Jetzt starten" }
// model: "anthropic/claude-sonnet-4.5"
// usage: { inputTokens: 2789, outputTokens: 861, cost: 0.023012 }

Build your first localization engine →