1. AIX：
AIX是IBM提供的一系列专有操作系统。 AIX代表Advanced Interactive eXecutive。最初，它是为IBM RT PC RISC工作站设计的，后来又用于各种硬件平台，例如IBM RS / 6000系列，基于PowerPC的系统，System-370大型机，PS-2个人计算机和Apple Network Server。它是五个具有The Open Group的UNIX 03标准认证的商业操作系统之一。 AIX的第一个版本于1986年发布。AIX的最新稳定版本是7.2。
2. iOS：
iOS是Apple公司提供的移动操作系统。它主要是为iPhone和iPod Touch等Apple移动设备设计的。它以前被称为iPhone OS。它是基于达尔文(BSD)操作系统的类Unix操作系统。它是仅次于Android的世界第二使用最多的移动操作系统。它主要用C，C++，Objective-C，汇编语言和Swift编写。 iOS的第一个版本于2007年发布。iOS的最新稳定版本是13.1。
AIX和iOS之间的区别：
| AIX | iOS |
|---|---|
| It was developed and is owned by IBM. | It was developed and is owned by Apple Incorporation. |
| It was launched in 1986. | It was launched in 2007. |
| Its target system type is Server, NAS and workstation. | Its target system type are smartphone, music player and tablet computer. |
| Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA | Computer architectures supported are ARMv8-A (iOS 7-present), ARMv7-A (iPhone OS 3-iOS 10) and ARMv6 (iPhone OS 1-iOS 4.2.1). |
| Kernel type is Monolithic with modules. | Kernel type is Hybrid. |
| The native APIs are SysV/POSIX. | The native APIs are Cocoa and BSD-POSIX. |
| Preferred license is Proprietary. | Preferred license is Proprietary, APSL and GNU GPL. |
| Update management is Service Update Management Assistant (SUMA). | Update management is Software Update. |
| File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS. | File systems supported are HFS+ and APFS. |