I stumbled across this website when trying to find a shade that matched me in Makeup Forever’s Ultra HD Foundation. The website is called Findation.com and how it works is that you add shades that you know match you at the moment (it has a pretty extensive database) and then it gives a list of recommended finishes and shades based on your current preferences.
I added Nars Sheer Glow in Santa Fe and Estee Lauder’s Double Wear in Ecru. For makeup Forever it advised the shade Sand, which is the one that I was looking at.
I’m not sure how accurate the site is, as I haven’t bought the foundation to test it out. However, it did find my shade in the Clinique foundation which impressed me.
This is definitely worth checking out if you buy your foundations online to prevent spending money on the wrong shade.