Dunno about 'best,' but I use http://jsspeccy.zxdemo.org Since it's Javascript, I believe you should be able to use it offline, too. But, as they say in all the best computer books, that is left as an exercise for the reader . Source: about 1 year ago
You can play it online here after searching for the game in the menu. Source: over 1 year ago
Okay, do me a favor. Go to https://jsspeccy.zxdemo.org/, and start up the spectrum emulator. Choose '48 BASIC'. Once the emulated speccy boots up, press and hold down the 'C' key. It should start typing: CONTINUE CONTINUE CONTINUE CONTINUE CONTINUE ... Within a couple of seconds, the input latency will have become noticeable. After about half a screen is filled up with CONTINUEs you can take your finger off the... - Source: Hacker News / almost 2 years ago
Do you know an article comparing JSSpeccy to other products?
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