Free CGM report

See what your glucose sensor saw

Drop the export from your sensor’s app and get a clear report: your 24-hour profile (AGP), time in range, GMI, variability, your biggest rises and what happened overnight.

Drop your glucose export here.csv · .xlsx · .txt · Apple Health export.zip · several files at onceChoose files

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Most sensors

LibreView, Dexcom Clarity and Stelo, Lingo, SiBionics, Apple Health, or any CSV with times and readings.

How to export your data

Free glucose tools

GMI calculatorTime in range calculatorGlucose variability (CV) calculatorMeal spike checkermg/dL ↔ mmol/L converterCompare two CGM exports

Questions people ask

How do I read an AGP report?
An AGP (ambulatory glucose profile) lays all your days on one 24-hour clock. The middle line is your median: at that time of day, half your readings were above it and half below. The darker band holds the middle half of your readings (25th to 75th percentile) and the lighter band holds 90% of them (5th to 95th). A narrow band means your days look alike at that hour; a wide one means they vary. Look for the hours where the line or the bands rise, and think about what you usually do then.
What is a normal time in range without diabetes?
The 70–180 mg/dL (3.9–10.0 mmol/L) band was set by an international consensus for people with diabetes, with a goal of more than 70% of the time. Studies of adults without diabetes find most of the day inside a tighter band: one multicentre study found about 96% of the time between 70 and 140 mg/dL (3.9–7.8 mmol/L) (Shah et al. 2019), and the larger Framingham study found about 3 hours a day above 140 (Spartano et al. 2024). Sensors and people differ, so treat these as context rather than a pass mark.
How do I export my data from LibreView?
On a computer, sign in at libreview.com with the account your Libre app uploads to, choose Download glucose data, complete the check and save the .csv file. Then drop it on this page. Menu names can differ by version. The file keeps your LibreView units (mg/dL or mmol/L) and date style; this tool reads both.
Is my data uploaded?
No. Your file is read by your browser on your device and the report is drawn there. Nothing is sent to HealthOS or anyone else, and there is no account. We count anonymous events such as “a report was viewed” and the file type, never a glucose reading.
What is GMI?
GMI (Glucose Management Indicator) estimates the A1C lab result that usually goes with your average sensor glucose: 3.31 + 0.02392 × your average in mg/dL (Bergenstal et al. 2018). It is most reliable with 14 days or more of data. It isn’t a lab test, and a measured A1C can differ from it.
Why does my CGM show lows at night?
Often it’s the sensor rather than your glucose. Lying on the sensor presses on the tissue around it, so the reading drops fast and comes straight back when you roll over. These are called compression lows. This report marks short, sharp overnight dips that recover quickly as possible compression. If you see low readings you can’t explain or you feel unwell, check with a finger-prick meter and talk to a doctor.