1. macOS：
macOS是Apple Incorporation提供的一系列专有图形操作系统。它以前被称为Mac OS X，后来被称为OSX。它是专门为Apple mac计算机设计的。它基于Unix操作系统。它是使用C，C++，Objective-C，汇编语言和Swift开发的。它是仅次于Windows的个人计算机中第二使用最多的操作系统。苹果于2001年发布了macOS的第一个版本。
2. Haiku：
Haiku是Haiku Incorporation提供的免费开源操作系统。它主要是为个人计算机设计的。它与已暂停的操作系统BeOS有很多相似之处。它主要用C++编写，并提供了一个面向对象的API。该操作系统的开发始于2001年，并于2008年成为自托管操作系统。Haiku的第一个版本于2009年发布。
macOS和Haiku之间的区别：
| S.No. | MACOS | HAIKU |
|---|---|---|
| 1. | It was developed and is owned by Apple Incorporation. | It was developed and is owned by Haiku Incorporation. |
| 2. | It was launched in 2001. | It was launched in 2009. |
| 3. | Its target system types are workstation, personal computers and embedded systems. | Its target system types are personal computers. |
| 4. | Computer architectures supported by macOS are x86-64(10.4.7-present), IA-32(10.4.4-10.6.8) and PowerPC(10.0-10.5.8). | Computer architectures supported by Haiku are IA-32, PowerPC and x86-64. |
| 5. | Its kernel type is Hybrid with modules. | Its kernel type is Hybrid. |
| 6. | Its package management is macOS installer. | Its package management is Ports collection (haikuport). |
| 7. | Its update management is Software Update. | Its update management is pkgman and HaikuDepot. |
| 8. | Its native APIs are Carbon, Cocoa, Java and BSD-POSIX. | Its native APIs are POSIX and BeOS API. |
| 9. | It has preferred license of Proprietary, APSL and GNU GPL. | It has preferred license of MIT. |
| 10. | The non-native APIs supported by its subsystems are Toolbox, Win16 and Win32. | The non-native APIs supported by its subsystems are Java and Qt. |
| 11. | File systems supported by macOS are HFS+, APFS, HFS, UFS, AFP, ISO 9660, FAT, UDF, NFS, SMBFS, NTFS, FTP, WebDAV and ZFS. | File systems supported by Haiku are BFS, FAT, ISO 9660, ext3 and NTFS. |