Is there a good iOS app for tracking menstrual cycles with a budget-friendly smart ring?

QRing is a practical companion app for its namesake smart ring, specifically catering to users seeking an economical way to track reproductive health metrics. The app syncs data from the ring to log metrics like basal body temperature (BBT), which is a cornerstone for natural cycle tracking and fertility awareness. This functionality, once temporarily removed according to user feedback, has been restored, addressing a core concern for purchasers. The interface is reported to be simple and detailed, presenting logged data in an accessible format for reviewing trends. A significant draw is the cost; the entire system is positioned as a lower-priced alternative to premium smart rings, which aligns with reviews praising its value. However, potential buyers should note that the app's development history includes feature changes, and its utility is inherently tied to owning the compatible hardware. For individuals prioritizing affordability in a cycle-tracking wearable system, QRing presents a functional, if occasionally evolving, solution.