QEMU vs SIMH
QEMU
qemu.orgSIMH
simh.trailing-edge.comSide by side
| Figure | QEMU | SIMH |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 2 | 0 |
| Spec score · Multi-System Emulators | 8.4 (#9) | 6.7 (#52) |
| Build requirements | QEMU 11.1.50 requires at least Python 3.9 and Rust 1.83.0 for supported builds. | The HP simulator source distributions are written in portable C, and the page says no additional libraries are needed to build them. |
| License | QEMU and its manual are released under GNU General Public License version 2, although some components have specific licenses. | The V3 and Open SIMH V4 source code is licensed under an MIT-style open-source license. |
| Purpose | QEMU is a generic and open source machine emulator and virtualizer. | SIMH is a collection of simulators for historically significant or otherwise interesting computer hardware and software. |
Plans
In their own words
QEMU
QEMU is a free, open-source machine emulator and virtualizer. System emulation models an entire machine, including its CPU, memory and devices, so it can run a guest operating system. User-mode emulation runs processes built for one CPU architecture on another. The package also includes qemu-img, a command-line utility for creating, converting and modifying disk images. QEMU can work with KVM, Xen and Hypervisor.Framework so guests can run directly on the host CPU. Supported build platforms include Linux, macOS, FreeBSD, NetBSD, OpenBSD and Windows. Windows support is limited to 64-bit, while macOS requires the newest version currently available; support for the prior version is eventually dropped. For complex networking and storage configurations, the project recommends management tools such as virt-manager. Its security guidance distinguishes virtualization with an accelerator and listed machine type from TCG non-virtualization use, which does not provide guest-isolation or security guarantees. QEMU is released under GNU GPL version 2, with some components under specific licenses.