Best CGM for testing food and exercise
As of August 2026 the FreeStyle Libre 2 Plus ranks first of 8 devices we track here, at £51.99 to try.
Ranked by how often the sensor reads, then by what periodic testing costs. Reading frequency decides whether you actually see a meal spike: a sensor reporting every 15 minutes can blur or miss the peak entirely, while one reading every minute shows its shape.
- 1FreeStyle Libre 2 PlusAbbott · 15 days · every 1 min£51.99to try · 15 days
- 2FreeStyle Libre 3 PlusAbbott · 15 days · every 1 min£69.99to try · 15 days
- 3ZOEZOE · 14 days · every 1 min£149.00to try · 14 days
- 4Dexcom ONE+Dexcom · 10 days · every 5 min£35.00to try · 10 days
- 5Dexcom G7Dexcom · 10 days · every 5 min£51.25to try · 10 days
- 6Dexcom G6Dexcom · 10 days · every 5 minNot published
- 7Accu-Chek SmartGuideRoche · 14 days · every 5 minNot published
- 8Medtronic SimpleraMedtronic · 7 days · every 5 minNot published
Read next
- How to read your own glucose curve
Peaks, area under the curve, and the overnight baseline each tell you something different. Here is what a trace can support, and where people routinely over-read it.
- Food, movement, sleep and stress: what actually moves the curve
Four inputs change what a sensor shows you. The evidence behind them is not equally strong, and the one with the best evidence is the one people expect least.