Cloud Hypervisor vs UTM

Cloud Hypervisor is a free, open-source virtual machine monitor written in Rust for modern cloud workloads. It runs modern Linux and Windows guests on Linux hosts with x86-64 or AArch64 architectures, using minimal hardware emulation. Operators can manage VM lifecycles through a REST API or command-line interface, with an optional D-Bus API. It supports snapshots, nested virtualization, paravirtualized devices, physical device passthrough, and live migration between hosts without interrupting VMs. Migration data can be encrypted using mutual TLS. The maker says direct kernel boot reaches userspace in less than 100 ms. The project is supported by Kata Containers for running secure containerized workloads and is governed openly as part of the Linux Foundation. It has no commercial plan or usage limits stated. Linux hosts need kernel 4.11 or later for required KVM functionality; kernel 5.6 is recommended for adequate performance. Packages for some popular Linux distributions are available through the Open Build Service. For help, the project points users to GitHub discussions or Slack, with GitHub issues for bug reports and a mailing list for broader discussion.

UTM is a system emulator and virtual-machine host for macOS and iOS that can run Windows, Linux, and other operating systems. Its QEMU backend supports more than 30 processor types, including x86_64, ARM64, ARM32, MIPS, PPC, and RISC-V. On Apple Silicon, UTM uses Apple’s Hypervisor framework for ARM64 systems; Intel Macs can virtualize x86/x64, while Apple Silicon can emulate those architectures at lower performance. Apple Virtualization is also available for macOS and Linux on Apple Silicon. Virtual machines can run with a graphical display, terminal console, or headless, and support snapshots, nested virtualization, and multiple displays. The Mac app supports USB devices, bridged or shared networking, and external-drive storage; iOS supports shared directories, clipboard sharing, and port forwarding. macOS guests are limited to ARM-based Macs running macOS Monterey or later. Windows GPU acceleration is unavailable, and Linux hardware OpenGL acceleration is experimental. The GitHub version is free; the Mac App Store version costs 9.99 USD once and adds automatic updates.