Best CGM with alarms
As of August 2026 the Dexcom ONE+ ranks first of 4 devices we track here, at £35.00 to try.
Only devices with high and low glucose alarms, cheapest to start first. If you take insulin, alarms are the feature that matters most.
- 1Dexcom ONE+Dexcom · 10 days£35.00to try · 10 days
- 2Dexcom G7Dexcom · 10 days£51.25to try · 10 days
- 3FreeStyle Libre 2 PlusAbbott · 15 days£51.99to try · 15 days
- 4FreeStyle Libre 3 PlusAbbott · 15 days£69.99to try · 15 days
Read next
- Time in range, and why it beats a single number
Time in range is the share of the day your glucose sits between 3.9 and 10.0 mmol/L. It carries information that an average cannot, and it has been validated against real complications.
- Who should not bother with a CGM, and what to do instead
Some readers will get nothing from a glucose sensor that a cheaper test would not give them. Some need a different device from the one they are about to buy. Both are worth saying plainly.