Version July 2025
| FreeStyle Libre 2/FreeStyle Libre 2 Plus | FreeStyle Libre 3/FreeStyle Libre 3 Plus | Dexcom G6 | Dexcom G7 | Dexcom Stelo | Medtronic Guardian 3 | Medtronic Guardian 4 | Eversense E3 | Eversense E365 | |
| Insertion site | Arm | Arm | Abdomen | Abdomen or arm | Arm | Abdomen or arm | Abdomen or arm | Arm (implanted subcutaneously) | Arm (implanted subcutaneously) |
| Duration of sensor wear | 14 days/15 days | 14 days/15 days | 10 days | 10 days | 15 days | 7 days | 7 days | 180 days | 365 days |
| Calibration required? | No | No | No | No | No | Yes, every 12 hours (3 to 4 times recommended)¶ | No | Yes, every 12 hours for the first 21 days of use, then once daily | Yes, every 12 hours for the first 14 days of use, then once weekly |
| Warm-up time | 1 hour | 1 hour | 2 hours | 30 minutes | 30 minutes | 2 hours | 2 hours | 24 hours | 24 hours |
| Method of insertion | Self-insertion | Self-insertion | Self-insertion | Self-insertion | Self-insertion | Self-insertion | Self-insertion | Requires office-based procedure | Requires office-based procedure |
| Optional or customized alarms for glucose values | Low and high | Low and high | Predictive low and high, rate of change, low and high | Predictive low and high, rate of change, low and highΔ | No (not recommended for people using insulin) | Predictive low and high, rate of change, low and high | Predictive low and high, rate of change, low and high | Predictive low and high, rate of change, low and high | Predictive low and high, rate of change, low and high |
| Programmed/mandatory alarms for glucose values | None | Urgent low | Urgent low | Urgent low | None (not recommended for people using insulin) | Urgent low | Urgent low | Urgent low | Urgent low |
| Insulin pump integration? | No/Tandem t:slim X2 | mylife YpsoPump | Tandem t:slim X2, Omnipod 5, and mylife YpsoPump | Tandem t:slim X2 and Mobi; Omnipod 5 | No | Medtronic MiniMed 670G, 770G, 780G | Medtronic MiniMed 780G | No | No |
| Share feature for health care providers◊ | LibreView | LibreView | Clarity | Clarity | Clarity | CareLink | CareLink | Eversense Data Management System (DMS) Pro | Eversense Data Management System (DMS) Pro |
| Intermittent scanning ("flash") or real-time? | Intermittent scanning/Real-time | Real-time | Real-time | Real-time | Real-time | Real-time | Real-time | Real-time | Real-time |
CGM: continuous glucose monitoring.
* Listed devices are intended for personal use. Professional CGM devices (practice-owned) include the FreeStyle Libre Pro, the Dexcom G6 Pro, and the Medtronic iPro2.
¶ Fingerstick glucose measurements are also required to determine prandial insulin dosing.
Δ The Dexcom G7 has a "delay first alert" setting for high glucose. The alarm may be delayed until glucose remains elevated for a specified duration.
◊ All listed devices also have compatible smartphone apps that allow sharing of personal CGM data with followers (eg, family, friends, caregivers).
