In the SAP development landscape today, companies have two strong options for creating web applications: SAP Cloud Application Programming (CAP) and SAP Restful Application Programming (RAP). Although both programming models provide tools, frameworks, languages and best practices, the differences could hardly be greater.
CAP or RAP: a well-considered decision
Both SAP CAP and SAP RAP represent SAP programming models that consist of various libraries and tools. These frameworks accelerate and standardize the development process, allowing developers to focus more on business processes. The biggest difference between the two models is that while SAP RAP can be used for cloud and on-premise applications, SAP CAP is only suitable for cloud-based apps. It is important to note that the choice between SAP CAP and RAP should and can be made before each new development, not just once: It depends largely on the use case in question and the resources available. Understanding the differences between SAP CAP and SAP RAP is therefore key to ensuring the success of your application.
Knowledge and experience count
The decision should be based on the know-how of your IT team. Does your team have little or no experience with ABAP? In this case, SAP CAP might be the better choice as it is based on JavaScript, a widely used and well-supported programming language. Since ABAP developers are scarce on the job market, this could be an additional reason to prefer SAP CAP. Especially for new SAP customers or companies planning to move to the public cloud, CAP is a flexible and easily accessible solution.
Strategic considerations for on-premise users
Companies that continue to work in an on-premise environment and do not have an SAP Business Technology Platform (BTP) subscription should make strategic considerations. The implementation of CAP and the use of SAP BTP entail ongoing costs that need to be carefully weighed up. In such cases, SAP RAP may be the better choice due to its suitability for on-premise applications.
A brief comparison of CAP and RAP*
*The criteria listed here do not claim to be exhaustive
RAP or CAP: Which model suits your use case?
SAP RAP: RAP is particularly suitable for applications that process data within the SAP system. One example of this is an MES application for collecting feedback from production, which is integrated directly into SAP. Such applications are typically only accessible within the company network and use the stability and predefined functions of the RAP framework.
SAP CAP: CAP is ideal for modern, cloud-native applications that require a flexible user interface or special integrations. A classic example would be a production overview app in which workstations are displayed in different colors and positions - here CAP can fully exploit its strength in UI flexibility. Another relevant use case is the supplier portal: this requires a secure external access option where CAP can show off its advantages in terms of integration and security. Data provided via RAP in the backend is used here.
SAP CAP: A solution for outsourced developments
SAP CAP also takes on tasks that were previously often developed outside the SAP system, such as MES systems, monitoring applications or production overviews. Such solutions, which were previously often implemented in other technologies due to their special GUI requirements, can now be seamlessly integrated into SAP. CAP offers a standardized development environment in which web developers can work quickly and securely.
Summary: Strategy, know-how and future requirements are decisive
The choice between SAP CAP and RAP requires careful consideration of specific requirements, the existing system landscape and the expertise of your team. Both frameworks offer clear advantages - but the right decision can make all the difference to the success of your next development.
Interested in in-depth advice? Our team of experts is on hand to help you find the best solution for your requirements. Contact us for in-depth advice or a workshop on SAP CAP and RAP. Let's work together to unlock the full potential of both technologies for your company!
