Langcraft API Reference

Complete reference for the Langcraft Phoneme API. Authenticate with an API key, POST audio (WebM, WAV, MP3, M4A) to the analyze endpoint, and receive aligned word-level and phoneme-level results with confidence scores, IPA transcription, and articulatory metrics.

What you can build

• Pronunciation feedback: per-phoneme similarity scores with substitution detection.
• Reading fluency assessment: word-level and sentence-level alignment to a reference passage.
• Speaking proficiency exams: overall scores correlated with human raters at scale.
• Speech therapy tools: articulatory feature tracking over time.

Get started

Review the API documentation, try the live demo, or request an API key to integrate phoneme-level speech analysis into your product.