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Pro Free trial available
SoapEngine is licensed software, but they do have a free trial available. The trial limits users to using the software on an iPhone or iPad emulator, however, so there's no testing on an actual device.
Pro Supports a number of types of security
SoapEngine supports Basic, Digest, NTLM Authetication, WS-Security, Client side Certificate, and custom security headers. This gives the developer a larger number of options and approaches when it comes to securing their apps communications.
Con Paid software
SoapEngine is a licensed software, meaning you have to purchase a copy of it. Single licenses start at around $15.26 and an enterprise license starts at roughly $91.65.