I use the free Fertility Friend site, but there is a more extensive paid version that is pretty great, too! I'll be buying that when ttc is closer! The info on their website is incredibly helpful and it really explains everything, like what your different types of CM look like, etc.
Another Fertility Friend user here. I find the free version meets all my needs.
You can browse a bunch of charts on the site to check it out, or take a look at the charts in our siggys. Mine is basic/free and I don't share my intercourse info on my chart so it looks very basic but you can track quite a lot more. I find the tcoyf charts to be more complicated to view but I'm less familiar with the chart key/legend obviously.
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