Methods, computing systems, and computer-readable storage media are provided for automatic on-cloud integrated validations for client customizations. According to the methods, a first entity provides a hosted environment in a cloud. The hosted environment hosts a pre-release version of software. The hosted environment receives customizations to the pre-release version of the software. The customizations replace one or more submodules of the pre-release version of the software with a customized version of the one or more submodules, or add one or more new submodules to the customized version of the software. The pre-release version of the software is validated, via an automated test procedure, as being compatible with the customizations.