About Us

Hangzhou Yanxing Heyi Technology Co., Ltd. was founded in April 2026 and is headquartered in Hangzhou, Zhejiang. The company focuses on fundamental research at the intersection of AI and 3D modeling. We built the open-source CAD language faijs and the parametric model format fai.zip, and shipped FaiCAD — the first product line that executes CAD in real time on the phone — across WeChat Mini Program and the web, bringing professional parametric modeling from the workstation to the browser and the phone.

The founder holds a PhD from Zhejiang University and leads a team with deep roots in 3D geometric modeling, programming language design, and AI. Around these core technologies the company has filed multiple invention patent applications, 5 of which have passed preliminary examination by CNIPA. We actively build open-source ecosystems: faijs and other core projects are open source on GitHub.

Our mission: exploring the boundaries of AI to solve real-world problems.