JingJin AI is a native-level American English writing API designed for developers, writers, and cross-border sellers.
✅ Grammar Check: Instantly fix errors with authentic corrections
✅ Polishing: Refine sentences to sound natural & fluent
✅ Multi-tone Rewrite: Adjust formality (formal, casual, academic)
✅ Style Check: Get formality & professionalism scores
✅ Fast & Reliable: Built on top-tier AI models for production use
