How data flows between Dexcom G7, FreeStyle Libre 3, Eversense E3, and Medtronic Guardian Connect on one side, and the carbohydrate-counting applications on the other. Where the integrations work cleanly, where they require workarounds, and where the CGM trend itself is the more trustworthy signal.
When a carbohydrate-tracking application's stated carbohydrate count for a meal disagrees with the post-prandial CGM trend, the editorial position of Carb Counting Hub is that the CGM trend is, in nearly all cases, the more trustworthy signal. The application produces an estimate; the CGM produces a measurement. This article elaborates the position, lists the few exceptions, and discusses the clinical workflow implications.
The Eversense E3 is an implantable continuous glucose monitor with a six-month sensor lifetime, distinct from the patch-based Dexcom G7 and FreeStyle Libre 3. The application ecosystem differs accordingly. This article summarizes how Eversense E3 data flows into carbohydrate-tracking workflows and the practical implications for users.
Tidepool is the open-source data platform that has, for over a decade, served as the clinical-export and longitudinal-data layer for diabetes self-management. This article describes how Tidepool relates to consumer carbohydrate-tracking applications, what it offers that HealthKit does not, and where it fits in the contemporary AID and looping landscape.
Apple HealthKit is the data layer through which most consumer applications on iOS exchange glucose, carbohydrate, insulin, and other health data. This article describes how HealthKit mediates the connection between continuous-glucose-monitor applications and carbohydrate-tracking applications, the practical limitations of that mediation, and the implications for clinical use.
The Abbott FreeStyle Libre 3 is the current flagship Libre device, smaller and lower-latency than the Libre 2 it replaces. The application ecosystem differs from the Dexcom G7 ecosystem in several practical respects: Abbott's LibreView and LibreLinkUp components mediate sharing and clinical export, and the partner integration list is somewhat tighter. This article summarizes the ecosystem for users choosing a carbohydrate-tracking workflow.
The Dexcom G7 is the current flagship continuous glucose monitor in the Dexcom line. The application ecosystem around the G7 has matured rapidly since the device's broad availability, and most carbohydrate-tracking applications can now read G7 data through Apple HealthKit, Google Fit / Health Connect, or direct partner integrations. This article summarizes the integration paths and the practical implications for carb-counting workflows.
Medical disclaimer
Educational content only. CGM trend interpretation and any consequent decision about insulin dosing or carbohydrate intake should be made together with your endocrinologist or CDCES.