Which TTC apps have been most helpful?

Cool_ness • Trying for baby number 2. My 1st is 2 years old now. Been with my high school sweetheart for 13 years. I`m 28 years old.
I've tried so many. These are currently on my phone along with Glow. Every app has me at different ovulation days. Ovia gives me the most helpful information and it's nice looking.  Fertility friend kind of confused me. Thinking of deleting My days. 
Just started TTC so I can't say yet to the effectiveness. The reviews don't really speak on how good they are for fertility as much as they do about tracking cycles.
Any others to recommend?

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