We seem spoilt for Spectrum remakes lately -
This ESP32 one is perhaps a more 'pure' example in terms of the user experience,
and is similar to the PicoZX in some regards:
https://www.tindie.com/products/bobricius/picozx-handheld-zx...
But some of the others come with extra bells and whistles:
Most recently, The Spectrum, which is not without its detractors:
https://retrogames.biz/products/thespectrum/
Here's one you can take on the go:
https://retroradionics.com/OMNI-128HQ-LAPTOP-p75106221
Of course the super Spectrum Next, which is scarcer than hens teeth:
https://www.specnext.com/
But has its own clones:
https://ultimatemister.com/product-category/zx-spectrum/zx-n... &
https://zxrenew.co.uk/Xberry-Pi-p596973674
And here are some more DIY options:
https://www.bytedelight.com/?product_cat=harlequin128
& https://retrocomp.cz/produkt?id=62
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