I use both ff and tcoyf.com. I like to see them agree. They're both pretty similiar, but tcoyf.com has more settings that you might need to set to get results just right. FF is for those trying to conceive, so when we were charting but TTA, I just used tcoyf.com. Before that though, I charted on paper.
Re: Favorite conception site....other than fertility friend?
Are you talking charting or in general?
FF is good, the BUMP tickers are crap.
I know other ladies chart with tcoyf.com
I know you mean a website, but when I read your title of the post I thought, "in my uterus is where I want that conception site".
Although I believe fertilization happens on the egg's way down the tube and then implantation, but that was my general thought.
LFAF Summer 2016 Awards: