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. NetBSD：
NetBSD是由NetBSD Foundation提供的免费开放源代码操作系统。它基于Berkeley软件发行版。它是一个类似Unix的操作系统。它可用于许多平台，包括服务器，台式机，手持设备和嵌入式系统。 NetBSD项目着重于精心设计，在许多计算机体系结构中的代码清晰度和可移植性。 NetBSD的源代码是公开可用的，并已获得许可。 NetBSD的第一个版本于1993年发布，其内核类型是单片的。
macOS和NetBSD之间的区别：
| S.No. | MACOS | NetBSD |
|---|---|---|
| 1. | It was developed and is owned by Apple Incorporation. | It was developed and is owned by The NetBSD Foundation. |
| 2. | It was launched in 2001. | It was launched in 1993. |
| 3. | Its target system types are workstation, personal computers and embedded systems. | Its target system types are NAS, server, workstation and embedded systems. |
| 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 NetBSD are IA-32, x86-64, ARM, MIPS, PowerPC and sparc64. |
| 5. | Its kernel type is Hybrid with modules. | Its kernel type is Monolithic with modules. |
| 6. | Its package management is macOS installer. | Its package management is pkgsrc. |
| 7. | Its update management is Software Update. | Its update management is by source or by binary. |
| 8. | Its native APIs are Carbon, Cocoa, Java and BSD-POSIX. | Its native APIs are BSD-POSIX. |
| 9. | It has preferred license of Proprietary, APSL and GNU GPL. | It has preferred license of BSD. |
| 10. | The non-native APIs supported by its subsystems are Toolbox, Win16 and Win32. | The non-native APIs supported through its subsystems are Linux and others. |
| 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 NetBSD are UFS, UFS2, ext2, FAT, ISO 9660, NFS and LFS. |