LibreTranslate

Privacy-focused deployments reach for LibreTranslate when they need a translation API with no Google or Azure dependency. The server wraps the Argos Translate neural engine and its installable language packs in a REST API and web interface, self-hosted with pip install libretranslate, Docker (including a CUDA compose file for GPU inference), or Kubernetes; once language models are downloaded, the whole stack runs offline on commodity hardware, and the documentation lists 59 supported languages. Licensing is AGPL-3.0, the repository has about 15,500 stars, and documentation lives at docs.libretranslate.com. For teams that would rather not run infrastructure, a hosted instance at libretranslate.com offers the same API with paid keys, Pro at 29 dollars a month for bursts up to 80 translations a minute and Business at 58 dollars a month for up to 200, and the revenue funds development. It has become a default choice for open-source projects and privacy-sensitive products that need machine translation on their own hardware.