It is fun to feel like u have some control and something to focus on in the tww.. but for the cost are not accurate! I was near the end of my second cycle of testing and trying to capture one test my phone kept saying the "image is blurry"?? Which was odd cause the picture was clear from what I could see! I finally got it to take the test strip by manually cropping it. In that test it showed my hormones (that were at the top of the charts the day before had plummeted which was showing my progesterone now was under the limit it should be in the test. I am older so I thought this was a crappy reality and normal fluctuations and I might need progesterone supplements after all and expected my period early. however the next day they were at the top of the charts again!! I thought maybe it was an issue with the "blurry pic" so found my way through the app to see the pics of the actual test sticks in order to compare to the day before and after to really see if they dropped that much...... much to my surprise seeing the whole progression of sticks made me realize this is not accurate AT ALL!! Some sticks with very dark lines (as dark as the static line) for progesterone or estrone showed my numbers very low and some with barely visible lines showed my numbers off the charts high!! I don't think these are reliable at all!!! It did appear the lutenizing was more accurate as the lightness/darkness of those lines correlated with the lh testing numbers... don't let this mess with your emotions like It did mine.. and save your money