LectuLibre Builds Real-Time Literary Phrase Translation Using Python, FastAPI, and Claude AI

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AI-powered book translation platform LectuLibre developed a feature called Instant Translation Help, allowing readers to highlight any phrase in a partially translated book and receive a context-aware translation within seconds. The tool was built in response to user demand for quick, in-page translation assistance without disrupting the reading experience. The system uses Server-Sent Events via FastAPI to stream token-by-token responses from Claude 3 Haiku, retrieving surrounding paragraphs from a PostgreSQL database to preserve literary tone and context. A carefully engineered prompt instructs the model to handle idioms, metaphors, and cultural references with natural equivalents and brief explanations. The project highlighted key challenges around latency, prompt design, and maintaining translation quality in real-time literary contexts.

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