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! scope="col"|Latest Version
! scope="col"|[[libretro|Libretro Core]]
! scope="col"|<abbr title="Free/Libre and Open-Source Software">FLOSS</abbr>
! scope="col"|Active
! scope="col"|Relative Speed<ref group=N name=RelativeSpeed>As calculated by Carlo Delhez's clkfreq, originally distributed with his XTender emulator. The ZX81 has relatively complicated timing mechanics, depending on signalling of WAIT during NMI; relative speed is a measurement of how closely an emulator matches a real machine in terms of clock cycles spent processing within a frame. 100.0% denotes the same execution speed as a real machine.</ref>
! scope="col"|[[Recommended Emulators|Recommended]]
|-
! colspan="78"|PC / x86
|-
|[[Clock Signal|CLK]]
|[https://github.com/TomHarte/CLK/releases {{clkver}}]
|{{✗}}
|{{✓}}
|{{✓}}
|100.0%
|[https://github.com/chernandezba/zesarux/releases {{ZEsarUXVer}}]
|{{✗}}
|{{✓}}
|{{✓}}
|110.9%
|align=left|{{Icon|Windows}}
|[https://sourceforge.net/projects/eightyone-sinclair-emulator/files/ {{EightyOneVer}}]
|{{✓}}
|{{✓}}
|{{✓}}
|[https://1drv.ms/u/s!Ar4VkKtk_3JzgQFkPzv4WgWTMHNc?e=trhIHh 0.221]
|{{✗}}
|?
|{{✓}}
|114.9%
|[http://sz81.sourceforge.net/#downloads 2.1.7] <br/>[http://rullf2.xs4all.nl/sz81/ 2.3.10 (Unofficial)]
|{{✗}}
|{{✓}}
|{{✗}}
|100.0%
|align=left|{{Icon|Windows|DOS}}
|[http://problemkaputt.de/zx.htm 2.0]
|{{✗}}
|{{✗}}
|{{✗}}
|align=left|{{Icon|Windows|Linux|macOS|FreeBSD}}
|[http://www.mamedev.org/release.html {{MAMEVer}}]
|{{✓}}
|{{✓}}
|{{✓}}
|[https://www.zophar.net/sinclair/multi-machine.html 1.30b]
|{{✗}}
|?
|{{✗}}
|Not tested
|[http://www.zx81.nl/ beta 13]
|{{✗}}
|?
|{{✗}}
|Not tested
|[http://www.zx81.nl/ 4.00]
|{{✗}}
|?
|{{✗}}
|101.5%
|[http://zx81.vb81.free.fr/vb81/download/vb81-full.exe 1.30]
|{{✗}}
|?
|{{✗}}
|Not tested
|[http://zx81.vb81.free.fr/download/VB81_XuR_EXE.zip 1.30.3 (26/11/2019)]
|{{✗}}
|?
|{{✓}}
|100.5%
|{{✗}}
|-
! colspan="78"|Mobile / ARM
|-
|[https://sourceforge.net/projects/sz81/ SZ81] <br/><small>(xz80 & z81 based)</small>
|[http://sz81.sourceforge.net/#downloads 2.1.7]
|{{✗}}
|?
|{{✗}}
|100.0%
|[https://itunes.apple.com/us/app/zx81/id1180117434?mt=8 1.9.0]
|{{✗}}
|?
|{{✓}}
|100.1% <br/><ref group=N name=ZX81iOSSpeed>Provided by Kevin Palser the developer (and author of this note) because the app cannot load external programs, such as Carlo Delhez's clkfreq, due to Apple developer restrictions for iOS. Permission to include clkfreq in the app cannot be granted because Dr Delhez sadly passed away in 2015.</ref>
