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! 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>
|100.0%
|110.9%
|114.3%
|{{✓}}
|{{✗}}
|{{~}}
|-
|[[No$|No$ZX]]
|align=left|{{Icon|Windows|DOS}}
|[http://problemkaputt.de/zx.htm 2.0]
|{{✗}}
|{{✗}}
|100.1% <br/><ref group=N name=NoCashSpeed>After turning off the simulated hardware improvements that were not standard in the original computer.</ref>
|{{✓}}
|Not tested
|Not tested
|?
|?
|{{✗}}
|101.5%
|Not tested
|100.0%
|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>
Content from corrupted revisions
! scope="col"|[[libretro|Libretro Core]]
! scope="col"|<abbr title="Free/Libre and Open-Source Software">FLOSS</abbr>
! 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"|Active
! scope="col"|[[Recommended Emulators|Recommended]]
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|100.0%
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|110.9%
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|-
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|114.3%
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|{{✓}}
|-
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|?
|114.9%
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|{{~}}
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|[https://sourceforge.net/projects/sz81/ SZ81] <br/><small>(xz80 & z81 based)</small>
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|{{✓}}
|100.0%
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|[http://www.mamedev.org/release.html {{MAMEVer}}]
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|?
|Not tested
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|-
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|?
|Not tested
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|[http://zxplanet.emuunlim.com/xtender-review.htm XTender2[No$|No$ZX]]|align=left|{{Icon|Windows|DOS}}|[http://wwwproblemkaputt.de/zx.zx81htm 2.nl/ beta 130]
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|Not tested|{{✗}}|-|[http://www100.retroisle.com/sinclair/zx81/emulators.php ZX81 Emulator] 1% <br/><smallref group=N name=NoCashSpeed>(Paul Robson)After turning off the simulated hardware improvements that were not standard in the original computer.</smallref>|align=left|{{Icon|DOS}}|[http://www.zx81.nl/ 4.00]
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|[http://zx81.vb81.free.fr/vb81/download/vb81-full.exe 1.30]
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|?{{✓}}|Not tested
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|-
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|?
|100.5%
|{{✓}}
|100{{✗}}|-|[http://zxplanet.emuunlim.com/xtender-review.htm XTender2]|align=left|{{Icon|DOS}}|[http://www.zx81.nl/ beta 13]|{{✗}}|?|Not tested|{{✗}}|{{✗}}|-|[http://www.retroisle.com/sinclair/zx81/emulators.php ZX81 Emulator] <br/><small>(Paul Robson)</small>|align=left|{{Icon|DOS}}|[http://www.zx81.nl/ 4.00]|{{✗}}|?|101.5%|{{✗}}
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|-
|[http://sz81.sourceforge.net/#downloads 2.1.7]
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|?{{✓}}|100.0%
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|-
|[https://zx81-ios.weebly.com ZX81 iOS]
|align=left|{{Icon|iOS}}
|[https://itunes.apple.com/us/app/zx81/id1180117434?mt=8 1.910.0]
|{{✗}}
|?
|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>
|{{✓}}
|{{~}} <br/><ref group=N name=ZX81iOSNeutered>This app is neutered as loading of external programs into emulator apps from the App Store is prohibited by Apple. However, it does have a growing selection of programs included with permission granted by their authors.</ref>
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