1.iOS：
iOS 是由 Apple Incorporation 提供的移动操作系统。它主要是为 iPhone 和 iPod Touch 等苹果移动设备设计的。它早先被称为 iPhone 操作系统。它是一个基于Darwin(BSD) 操作系统的类Unix 操作系统。它是仅次于 Android 的全球第二大移动操作系统。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 年推出。
2. GhostBSD :
GhostBSD 是由 Eric Turgeon 和 GhostBSD 团队开发的免费开源操作系统。它是一个类 Unix 操作系统，其设计灵感来自 TrueOS 操作系统。它有一个名为 MATE 的默认桌面环境。它专门用于台式机和工作站。早些时候，它使用了一个名为 GNOME 的默认桌面环境。 GhostBSD 的第一个版本于 2009 年推出。它具有带有模块的 Monolithic 内核。
iOS 和 GhostBSD 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. |