[spoonalious]

Time zone, your phones memory, screen size (eg, 12 Max, Mini, otherwise), what browser you accessed it with (more using Safari on iOS than Chrome).

[ec109685]

Time zone is good point. Just tested a iPhone 12 Pro and iPhone 12 and results were identical (despite having different amounts of memory).

[cyral]

It uses a lot more advanced techniques too, like rendering text and shapes in a hidden canvas + webgl, which will render slightly different between hardware, drivers, etc. Was also surprised to see that my HTTP_ACCEPT header was unique in 1 of nearly 5,000 devices, considering I am on a fresh (literally days old) MacOS install.