There are several Sinclair ZX81 emulators available for PC, including:
- EightyOne: A popular emulator that emulates not only the ZX81, but also the ZX Spectrum and ZX Spectrum Next. It is available for Windows and has a user-friendly interface with many features.
- ZEsarUX: A cross-platform emulator that supports the ZX81 and many other systems, including the ZX Spectrum and Amstrad CPC. It is available for Windows, Mac, and Linux.
- UnrealSpeccy: An emulator that supports both the ZX Spectrum and ZX81. It is available for Windows and has a simple interface.
- WinZ80: A basic emulator for the ZX81 that is available for Windows.
- JtyOne: A web-based emulator that emulates both the ZX81 and ZX Spectrum. It can be run in a web browser and does not require any software installation.
There are also many other ZX81 emulators available, but these are some of the most popular and well-regarded options.