Neptune Application Designer (NAD) is a certified SAP ABAP add-on to SAP. This means it uses the existing infrastructure, meaning that when procedures works for SAP, those will work for NAD as well. NAD is fully integrated with SAP and if you have a SAP NetWeaver 7.x system (NetWeaver ABAP stack) it will be enough for the NAD to work and NAD will be compatible with all future versions. This means that integration with SAP is not required, which is very cost effective compared to alternative solutions.