What's the best iOS app for getting automatic blood sugar alerts from a wearable sensor?

FreeStyle Libre 3 – US is a companion application for Abbott's wearable CGM (Continuous Glucose Monitor) system. The core function is to display real-time glucose data streamed automatically from the small, coin-sized Libre 3 sensor, which is worn on the back of the upper arm. For the specific use case of receiving automatic alerts, the app is a primary solution. Once paired, it provides configurable alarms that will notify the user on their iPhone if glucose levels are predicted to go too high or too low, a critical feature for proactive diabetes management. Specific features include a live glucose graph, trend arrows showing the direction and speed of glucose changes, and data-sharing capabilities with caregivers via LibreLinkUp.

Reviews indicate high satisfaction with the accuracy of the readings when the system functions properly, with some users reporting close alignment with traditional blood draws. However, a balanced assessment must note significant limitations. User feedback frequently points to technical frustrations, including app crashes, sensors failing prematurely, and false alarms. The app's stability can also be a concern following major iOS updates, leading some users to hesitate before updating their phone's operating system. While the concept is strong, the user experience is sometimes marred by reliability issues that can be both financially and medically concerning.