Yoyaku is an open-source booking engine core designed for developers and agencies who need to build custom appointment scheduling systems. It provides the foundational functionality required to create tailored booking experiences without the constraints of pre-packaged plugins.

Flexible Service Management lets you define a wide range of services, from simple appointments to multi-session workshops, with control over duration, capacity, and buffer times. Granular Staff Management allows you to assign services to specific team members and manage their individual schedules and availability. Customizable Booking Forms enable the creation of data collection forms with conditional logic, ensuring you gather exactly the information needed for each booking scenario. Open-Source Foundation grants developers full access to the codebase for inspection, modification, and extension, removing dependency on proprietary feature roadmaps. Agency-Friendly Scalability supports managing multiple client installations with a consistent, adaptable core that can be branded to fit different business identities.