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I don't know what everyone else said as far as free charting online, but I use Fertility Friend, the free version. I used to use TCOYF, but that's like $40. And I can't use it anymore because I got a Mac.[/b]
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A word of caution about using FF to TTA - it's a neat website, but don't rely on it's interpretations alone for TTA! It's designed for TTC and doesn't really go into enough detail for avoiding purposes. Ovusoft, the program that goes along with Taking Charge of Your Fertility is much more comprehensive for avoiding. But as with any website, software, or program - they should never be relied on alone for TTA. They are helpful tools, but should not be used as substitutes for having proper training in how to interpret your charts on your own. The most effective way to use charting to avoid is to take a course that teaches you how to do that, either online or in person - but with a certified instructor for personalized support as you learn. Then you can use any website you want as a charting tool, because you will know when the program is making an error since you have the knowledge and skills to interpret the chart yourself.
Some of the most popular programs/websites for TTA are:
www.ovusoft.com (goes with
Taking Charge of Your Fertility)
www.nfpcharting.com (for Billings Ovulation Method or Creighton Model charting only)
www.go28days.com (does not interpret for you, you do the interpretations yourself)
Cyclepro software from the Couple to Couple League