I think doing it online can be problematic. I already knew that I was cool not warm. Online, I was analyzed as a summer. And, actually, as I have naturally white-blonde hair, blue eyes, and don't tan, that should be correct. When I took quizzes online, I always came up as a summer.
After the online analysis, I tried to wear some of the pale summer colors, but always felt washed out.
I was then analyzed in person by House of Colour. I am actually a true winter (some systems say you can't be a winter blonde, but I most definitely am). I always knew, actually, that these tones - navy, jewel-toned pink, blue, and green, ice pink, blue and green (but not for a whole outfit - I need more depth) and true red suited me. So it affirmed that.
It also explained why marled fabric looked, well, scruffy on me. I had a coat - an amazing sort of French navy, which had a white marl in the fabric. I LOVED the cut of that coat (I found it second-hand at a market in France), it really was a beautifully made piece of clothing. But, whenever I put it on, I looked, well, sort of scruffy. In contrast, my deep solid navy coat looks expensive. I could never explain that before.
Now I have far fewer clothes, but I love them all, and they all mix and match perfectly. Opening my wardrobe feels like looking at a rail in a shop where I love every single piece.
So, in-person analysis is the way to go, I think.
(And those who look worse after color analysis, I think, tend to be those who only wear their colors and try to wear them all at once, ignoring how colors are being paired at the moment in fashion. As a winter, high contrast suits me, but I would never wear black trousers and a bright top, because that's a very dated look (in fact, I don't have any black trousers at all, as navy is my key neutral). Tonal is more in fashion at the minute, so I might wear mono-tone, or tonal but in a small range of deep colors with some contrast (so orchid pink skirt with indigo thin cashmere sweater).