LectuLibre Builds Real-Time AI Translation Help Using FastAPI, Claude, and SSE

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Book translation platform LectuLibre developed an on-demand translation assistance feature to address shortcomings in its automated AI translations. The tool allows users to highlight any passage in a translated EPUB or PDF and instantly receive alternative translations, explanations, and stylistic suggestions streamed in real time. Built on a FastAPI backend, the system uses Server-Sent Events to forward token-by-token output from Anthropic's Claude API without blocking the main translation pipeline. Context-aware responses are enabled by retrieving surrounding text chunks from a PostgreSQL database, avoiding the need to reload entire books. The architecture prioritizes low latency, cost efficiency, and async independence from the core translation workflow.

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