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. AmigaOS 4：
AmigaOS 4 是由 Hyperion Entertainment 提供的 Amiga 操作系统系列。它用于运行 PowerPC 微处理器。它的设计主要基于 Commodore 的 AmigaOS 3.1。它部分基于德国公司 Haage and Partner 的 AmigaOS 3.9。它主要是用C语言编写的。它属于 AmigaOS 家族。 AmigaOS 4 的第一个版本于 2004 年推出。AmigaOS 4 的最新稳定版本是 4.1 Final Edition。它也被称为 OS4 或 AOS4。
iOS 和 AmigaOS 4 的区别：
| S.No. | IOS | AMIGAOS 4 |
|---|---|---|
| 1. | It was developed by Apple Incorporation. | It was developed by Hyperion Entertainment. |
| 2. | It was launched in 2007. | It was launched in 2004. |
| 3. | Its target system types are smartphone, music player and tablet computer. | Its target system types are workstation and personal computers. |
| 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 AmigaOS 4 is PowerPC. |
| 5. | Its kernel type is Hybrid. | Its kernel type is Microkernel. |
| 6. | Its native APIs are Cocoa and BSD-POSIX. | Its native APIs are Proprietary. |
| 7. | It has the preferred license is Proprietary, APSL and GNU GPL. | It has the preferred license of Proprietary. |
| 8. | Its update management is Software Update. | Its update management is AmiUpdate which is almost not needed. |
| 9. | The non-native APIs are not supported through its subsystems. | The non-native APIs supported by its subsystems are BSD subsets. |
| 10. | File systems supported by iOS are HFS+ and APFS. | File systems supported by AmigaOS 4 are OFS, FFS, SFS, PFS, JXFS, FAT, ISO 9660, UDF and SMBFS. |