Building a smart factory is essential for small and medium-sized factories. With limited production capacity, these factories often suffer from slow response times and weak emergency handling capabilities, especially when facing issues such as machine breakdowns, raw material shortages, sudden order surges, or ad-hoc order insertions, which can significantly impact their already constrained capacity. To address these challenges, Alps System Integration (Dalian) Co., Ltd., drawing on over 30 years of experience serving the manufacturing industry, has designed and developed the APS planning and scheduling system. This system empowers small and medium-sized factories to build their smart factory, enabling end-to-end tracking from raw materials to delivery, real-time adjustments and proactive avoidance based on site variables, and inventory optimization according to orders and production data to minimize inventory backlog and reduce carrying costs—greatly enhancing production capacity. Furthermore, the APS planning and scheduling system is hosted on a SaaS platform, leveraging modular and component-based services to significantly lower the cost of building a smart factory, allowing small and medium-sized factories to embark on their smart factory journey with ease.