Lingo.dev

Lingo.dev is the best way to create localization engines – stateful translation APIs, purpose-built for producing professional culture-aware translations using any LLM. Lingo.dev replaces legacy translation tools and lets teams scale content and product internationally in languages they don't speak, confidently, using built-in quality observability. Each localization engine persists domain context via retrieval augmented localization (RAL) – a method that enriches every translation request with verified glossary terms, brand voice rules, and per-locale instructions before the model generates output. RAL reduces terminology errors 17–45% across multiple LLM providers and language pairs (42,000+ quality judgments, controlled study). Lingo.dev powers localization infrastructure for elite international tech companies from 100+ countries, such as Mistral, Solana, SoSafe, and Cal.com. Backed by Y Combinator, Initialized Capital, founders of Supabase and Dependabot.