1. iOS：
iOS是苹果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Darwin(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。
2. GhostBSD：
GhostBSD是一个免费的开源操作系统，由Eric Turgeon和GhostBSD Team开发。它是一个类似Unix的操作系统，其设计灵感来自TrueOS操作系统。它具有一个称为MATE的默认桌面环境。它专门用于台式机和工作站。先前，它使用了称为GNOME的默认桌面环境。 GhostBSD的第一个版本于2009年发布。它具有带模块的Monolithic内核。
iOS和GhostBSD之间的区别：
| S.No. | IOS | GHOSTBSD |
|---|---|---|
| 1. | It was developed by Apple Incorporation. | It was developed by Eric Turgeon. |
| 2. | It was launched in 2007. | It was launched in 2009. |
| 3. | Its target system types are smartphone, music player and tablet computer. | Its target system types are workstation and desktop. |
| 4. | Computer architectures supported by iOS are ARMv8-A (iOS 7-present), ARMv7-A (iPhone OS 3-iOS 10) and ARMv6 (iPhone OS 1-iOS 4.2.1). | Computer architectures supported by GhostBSD are IA-32 and x86-64. |
| 5. | Its kernel types is Hybrid. | Its kernel type is Monolithic with modules. |
| 6. | Its native APIs are Cocoa and BSD-POSIX. | Its native APIs are BSD/POSIX. |
| 7. | It has preferred license is Proprietary, APSL and GNU GPL. | It has preferred license of BSD. |
| 8. | Its update management is Software Update. | Its update management is by source or network binary update. |
| 9. | File systems supported by iOS are HFS+ and APFS. | File systems supported by GhostBSD are UFS2, ext2, ext3, FAT, ISO 9660, UDF, NFS, ReiserFS, XFS and ZFS. |
| 10. | The non-native APIs are not supported by its subsystems. | The non-native APIs supported by its subsystems are Mono, Java, Win16, Win32 and Linux. |