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|-
|[[EightyOne]]
|Windows
|[https://sourceforge.net/projects/eightyone-sinclair-emulator/files/ {{EightyOneVer}}]
|{{✓}}
|{{✓}}
|114.3%
|{{✓}}
|-
|[[ZEsarUX]]
|Multi-platform
|[https://github.com/chernandezba/zesarux/releases {{ZEsarUXVer}}]
|{{✗}}
|{{✓}}
|110.9%
|{{✓}}
→Emulators: fixed table by ACCURACY
! 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]]
|-
|[[Clock Signal|CLK]]
|{{✓}}
|100.0%
|{{✗✓}}
|-
|[https://sourceforge.net/projects/sz81/ SZ81] <br/><small>(xz80 & z81 based)</small>
|{{✗}}
|100.0%
|{{✓}}
|-
|[[ZEsarUX]]
|Multi-platform
|[https://github.com/chernandezba/zesarux/releases {{ZEsarUXVer}}]
|{{✗}}
|{{✓}}
|110.9%
|{{~}}
|-
|[[MAMEEightyOne]]|Multi-platformWindows|[httphttps://wwwsourceforge.mamedev.orgnet/projects/eightyone-sinclair-emulator/files/release.html {{MAMEVerEightyOneVer}}]
|{{✓}}
|{{✓}}
|Not tested114.3%|{{✗~}}
|-
|[[No$|No$ZX]]
|100.1% <br/><ref group=N name=NoCashSpeed>After turning off the simulated hardware improvements that were not standard in the original computer.</ref>
|{{~}}
|-
|[[MAME]]
|Multi-platform
|[http://www.mamedev.org/release.html {{MAMEVer}}]
|{{✓}}
|{{✓}}
|Not tested
|{{✗}}
|-
|[http://zxplanet.emuunlim.com/mme-review.htm MTMW] <br/><small>(aka 'MulTiMachine')</small>
