I've been wearing continuous glucose monitors for a long time. Long enough to have opinions that have nothing to do with spec sheets.
This isn't a sponsored review. It's not a side-by-side chart of accuracy percentages. It's what I actually noticed wearing each system day to day, exercising, sleeping, traveling, and living with T1D through all of it.
Dexcom
Dexcom is the one most people start with, and for good reason. The ecosystem is mature, the integrations are broad, and the accuracy is reliable. The G7 is a meaningful improvement over the G6, particularly in size and warmup time.
My honest take: it's the safe choice, and safe is genuinely valuable when you're managing a chronic condition. The alerts are customizable, the app is polished, and the data sharing features are useful if you have people in your life who want to follow along.
What it lacks is any real differentiation anymore. It does the core thing well and doesn't do much else.
Abbott Libre
The Libre changed the CGM market when it came out. Affordable, no fingerstick calibration, and a design that worked for people who didn't want something bulky on their arm. The Libre 3 brought real-time readings and alarms, which closed the biggest gap with Dexcom.
My honest take: the accuracy can be inconsistent in ways that matter if you're dosing based on CGM readings. It's improved significantly but it still has moments that make you reach for a fingerstick. For the price point, it makes sense for a lot of people. It just isn't my daily driver.
Eversense 365
This one is different from the others in a fundamental way: it's implanted. A small sensor sits under the skin for up to a year, and a removable transmitter sits over it. No weekly or bi-weekly sensor changes. No adhesive to manage. No sensor falling off mid-swim.
I switched to the Eversense 365 and it's been my system of choice since. The convenience of not dealing with sensor changes is hard to overstate once you've experienced it. The accuracy is strong, and the fact that it integrates with the Twiist pump sealed the decision for me.
The tradeoff is the implant process itself. It requires a minor in-office procedure. That's a real barrier for some people, and it's worth being honest about. But once it's in, it disappears from your daily routine in a way no other CGM does.
A Note on Dexcom Accuracy in 2025 and 2026
I want to address something directly, because I think the T1D community deserves a straight answer rather than a carefully worded non-statement.
In March 2025, the FDA sent Dexcom a formal warning letter following inspections of their manufacturing facilities. What they found was significant: Dexcom had made an unauthorized change to a component inside the G7 sensor without FDA approval, and that change caused the sensors to perform worse by every accuracy metric Dexcom's own internal testing measured. The devices were legally classified as adulterated. They were sold anyway.
Two Class I recalls followed. The first, in June 2025, involved a speaker defect in G7 receivers that could cause missed alerts for high and low glucose levels. The second, in September 2025, covered a software defect in the G7 app that failed to alert users when a sensor unexpectedly stopped working. Class I is the FDA's most serious recall classification. Both of these involve the kind of failure that can land someone in the hospital.
On their October 2025 earnings call, Dexcom's leadership said the problems were related to the inserter and deployment mechanics, that they'd been fixed at the manufacturing level, and that complaint rates were expected to drop heading into 2026. Their stock had fallen from around $89 to below $60 by that point. CEO Kevin Sayer departed unexpectedly around the same time.
Dexcom has said the unauthorized component has been removed from all G7 sensors currently being produced. Whether the accuracy issues are fully resolved is something users will find out in real time, which is not a comfortable position to be in when you're dosing insulin based on those readings.
I'm not telling you to stop using Dexcom. A lot of people have no issues, and the system has genuinely helped people manage this disease for years. But I do think you deserve to know this happened, and to factor it into how much you trust any single reading from any CGM, including the one on your arm right now. Fingerstick when something doesn't feel right. That advice has never been wrong.
One More Thing on Dexcom: The Accuracy Problem
I want to add something here that I think matters for anyone making a CGM decision right now, because it's been in the news and the T1D community has been talking about it.
Dexcom's G7 accuracy has come under real scrutiny over the past year. In March 2025, the FDA sent Dexcom a warning letter after inspections found that an unauthorized component change had been made to G7 sensors — a change that, according to internal testing, caused the sensors to fail accuracy metrics. Dexcom sold those devices anyway. That's not a rumor. That's a regulatory action.
There were also two Class I recalls in 2025 — one in June for a receiver speaker defect that caused missed alerts, and one in September for a software issue that failed to notify users of sensor failure. Class I is the FDA's most serious recall category, reserved for situations with a reasonable chance of causing harm.
Lawsuits followed. Dexcom's stock dropped significantly. CEO Kevin Sayer departed. By late 2025, the company was saying the component issue had been resolved and accuracy was restored heading into 2026, with a new 15-day G7 sensor in development.
I'm not telling you Dexcom is finished or that you should throw your G7 in the trash. The system still works for a lot of people, and they appear to have addressed the root cause. But if you've noticed your readings feeling less reliable lately, you're not imagining it — and you deserved to know why. That's the kind of thing the community should be talking about directly, not dancing around.
It's also part of why the Eversense 365 has become more interesting to me. An implantable sensor with no adhesive, no weekly changes, and no component swap controversies is a different kind of reliability. Apples and oranges in some ways, but worth factoring in.
The Bottom Line
There's no universal right answer. The best CGM is the one you'll actually wear consistently, that fits your life and your budget and your specific management goals.
What I'd tell you is this: don't let the spec sheet make the decision. Try the one that makes sense logistically, wear it for a full sensor cycle, and pay attention to how it fits into your actual day. That's more useful than any comparison chart.