Macbook Pro Retina Early-2015
OS: High Sierra, 10.13.1
2.7 Ghz Intel Core i5
8GB 1867 Mhz DDR3

Macbook Pro Early-2013
OS: High Sierra, 10.13.1
2.7 Ghz Intel Core i5
8GB 1866 Mhz DDR3

&

iPhone X

iPad Air 2

Regarding Browsers, my day to day are Safari and DuckDuckGo but I'm open to whichever browsers are recommended or have yet to see much testing on these devices.