Compare continuous glucose monitors
As of August 2026 we track 8 continuous glucose monitors available here, and the cheapest one you can buy without a prescription is the FreeStyle Libre 2 Plus at about £103.98 a month.
| Device | Wear time | Readings | Accuracy (MARD) | Alarms | Prescription | Price per sensor | Monthly cost | Cost to try | Cost, testing 4× a year | Yearly cost |
|---|---|---|---|---|---|---|---|---|---|---|
| FreeStyle Libre 3 PlusAbbott | 15 days | every 1 min | Not published | Yes | Not required | £69.9915 days | £139.98per month | £69.9915 days | £279.96per year | £1,703.09per year |
| FreeStyle Libre 2 PlusAbbott | 15 days | every 1 min | Not published | Yes | Not required | £51.9915 days | £103.98per month | £51.9915 days | £207.96per year | £1,265.09per year |
| Dexcom G7Dexcom | 10 days | every 5 min | 8.2%manufacturer study | Yes | Not required | £51.2510 daysexcludes VAT | £153.75per month | £51.2510 days | £205.00per year | £1,870.63per year |
| Dexcom G6Dexcom | 10 days | every 5 min | 10%independent study | Yes | Required | Not published | Not published | Not published | Not published | Not published |
| Dexcom ONE+Dexcom | 10 days | every 5 min | Not published | Yes | Not required | £35.0010 daysexcludes VAT | Not published | £35.0010 days | £140.00per year | £1,277.50per year |
| Accu-Chek SmartGuideRoche | 14 days | every 5 min | Not published | Yes | Not required | Not published | Not published | Not published | Not published | Not published |
| Medtronic SimpleraMedtronic | 7 days | every 5 min | Not published | Yes | Required | Not published | Not published | Not published | Not published | Not published |
| ZOEZOE | 14 days | every 1 min | Not published | No | Not required | £149.00one-off test | Not published | £149.0014 days | Not published | Not published |
Prices are shown as each seller lists them. Some exclude VAT and some do not, so compare the tax basis as well as the figure. Diabetes VAT relief may apply to some buyers and not others.
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.