Yup has a more mature and well-documented API, making it easier for developers to get started and integrate into their projects. It has a clear and intuitive syntax for defining validation schemas. Runtypes, while also well-documented, has a slightly steeper learning curve due to its more expressive type definition syntax.
Yup is commonly used with form libraries like Formik and React Hook Form, providing seamless integration for form validation. Runtypes, on the other hand, is more generic and can be used in various contexts, including server-side validation and data validation in non-React projects.
Both libraries have excellent TypeScript support. Yup provides built-in TypeScript definitions and has good compatibility with TypeScript projects. Runtypes, being a library focused on type checking, has strong TypeScript integration and provides advanced type inference capabilities.
Both libraries are actively maintained by their respective communities. Yup has a larger user base and a longer history of maintenance, which ensures stability and ongoing updates. Runtypes, while newer, has shown active development and responsiveness to user feedback.