Senseonics
Eversense 365
As of August 2026 we track 6 continuous glucose monitors available here, and the cheapest one you can buy without a prescription is the Dexcom Stelo at about $99.00 a month.
Specifications
| Wear time | 365 days |
|---|---|
| Warm-up | 1440 minutes |
| Accuracy (MARD) | Not published |
| Readings | every 5 min |
| Alarms | Yes |
| Prescription | Required |
What does the accuracy figure mean?
MARD is the average gap between what the sensor says and what a laboratory blood test says, as a percentage. A 10% MARD means readings are off by about 10% on average — so a true 7.0 mmol/L might show as anywhere around 6.3 to 7.7. Lower is better. Most current sensors sit under 10%; twenty years ago they were over 20%. No sensor is exact, which is why treatment decisions still get confirmed with a fingerstick when a reading does not match how you feel.
Pricing
Not published
to try
Not published
per year
- per sensor · 365 days
- Not published
- per month
- Not published
Prices last checked: 2026-08-05
What works well
- One sensor lasts a year — no fortnightly sensor changes and nothing to re-apply
- The transmitter is removable, so you can take it off without losing the sensor
- Vibration alerts from the transmitter itself, not only from the phone
What to watch out for
- The sensor is implanted under the skin of the upper arm by a clinician, and removed the same way
- Needs calibrating with a fingerstick, unlike every other sensor here
- Requires a procedure appointment to start and to stop
Our verdict
The only CGM you wear for a year rather than a fortnight, and the only one that involves a minor procedure. Worth considering if changing sensors every two weeks is the thing you hate about CGM — and not otherwise.
Common questions
- Is the Eversense sensor implanted?
- Yes. A trained clinician places it under the skin of your upper arm through a small incision, usually closed with adhesive strips rather than stitches.
- How accurate is Eversense?
- The PROMISE study of the previous 180-day sensor reported 9.1% MARD, and 8.5% for a modified version. Senseonics has not published an equivalent peer-reviewed figure for the 365-day sensor, so we do not quote one.
- Does Eversense need calibration?
- Yes, roughly once a day with a fingerstick — the main practical drawback compared with factory-calibrated sensors.