I really believe this is the best fertility tracking app out there. It is well designed and easy to use. The chart itself has lots of customizable options for you to add data such as other symptoms you are experiencing, and you can track your temps in either Celsius or Fahrenheit. If youre new to fertility charting or if you need a reminder of one of the " rules" of the sympto thermal method, the knowledge base right inside the app has that info for you. The community is also super helpful if youre having trouble interpreting your chart! Ive been avoiding pregnancy using this app for 7 months now and am so pleased with it! Thanks kindara for your dedication in making this the best fertility app available!