China Startups funded by Y Combinator (YC) 2026

LemonBox is an AI-driven personalized nutrition company. Using generative AI nutrition（AI 生成式定制营养）, LemonBox analyzes each user's dietary habits, health goals, and biometric data to generate a custom daily supplement formula — then produces and delivers it as a personalized day pack via monthly subscription. Founded in Silicon Valley in 2016 and backed by Y Combinator, Bessemer Venture Partners, and Partech Ventures, LemonBox has served over 10 million users globally.

Crowdfunding has fueled an increase in innovative product companies turning to Chinese factories for production. Yet, Chinese factories seem undifferentiated because they all make the same, unverifiable claims of excellence. This results in competition centered on price. Factories are forced to under-bid contracts to win business, but often, they later surprise the customer with quality problems and delays. This process is broken. We install cameras and remote monitoring software on the assembly line, and this ensures compliance with test protocol, improves quality, reduces liability, and helps fight warranty fraud. We charge a nominal per-unit fee to the OEM and revenue share with the factory when they demonstrate compliance with quality standards (whether units pass or fail). It encourages better behavior from factories and rewards those who perform with an audit trail of good performance that helps them win new foreign business. On average, defect rate will fall 75% within 5 months of deploying Assembly at a factory.