A free program for Android, by Inito.

The Inito Fertility Monitor Device is an Android app that allows you to keep track of all of your fertile days. It functions with urine Test Strips and the Inito Fertility Reader. You can use this app to measure the levels of luteinizing hormone and estrogen in your urine. It is accurate to a lab standard.

Knowing and recognizing when you have entered the fertile window of your menstrual cycle is known as fertility awareness, additionally referred to as fertility tracking, ovulation tracking, natural family planning, or fertility charting. Decisions regarding pregnancy prevention and choice of whether and when to conceive can be influenced by knowledge of the body and the biology of reproduction.