Track Your Ovulation: Apple Watch vs. Oura Ring

Trying to have a baby? Trying not to have a baby? There’s now a smartwatch for that—and a smart ring, too.

The new Apple Watch Series 8 ($399 and up) and Ultra ($799), as well as the third-generation Oura ring ($299 and up), are modernizing the age-old practice of fertility tracking with advanced temperature sensors. Their accompanying software can detect slight rises in temperature to determine your ovulation, which typically causes an upswing of 0.5 to 1 degree Fahrenheit. This is the time of month you’re most likely to get pregnant.