Blood Sugar Log: Glucose Diary

Blood Sugar Log is the simplest way to track your blood sugar and glucose, completely free, fully offline, and private. No account, no sign-up, and no ads getting in the way of your readings. Just open the app and log.

Most diabetes apps hide the useful parts behind a subscription, or make you create an account and sync your health data to the cloud. This one doesn't. Your blood sugar log lives on your phone and nowhere else. There is nothing to sign into, and nothing to pay for to get the full logbook.

WHY YOU'LL LIKE IT
• Log a reading in seconds, value, plus fasting, before-meal, after-meal or bedtime, with optional carbs, insulin and notes.
• Works 100% offline. No internet, no account, no cloud, your data stays on your device.
• Ads never interrupt data entry, so logging is always fast and clean.
• Free PDF and CSV export, hand your doctor a clear blood sugar report at your next visit, with no paywall.
• See your time in range, averages, highs and lows, and an estimated A1c from your own readings.
• Simple reminders so you don't forget to check your sugar level.
• Local backup and restore, save your logbook to a file so you never lose your history.
• Both mg/dL and mmol/L supported, with clean light and dark themes.

BUILT FOR EVERYDAY DIABETES TRACKING
Whether you manage type 1, type 2, gestational diabetes or prediabetes, this glucose logbook keeps your numbers organized without the clutter. Tag each reading, spot patterns in the chart, and understand how your blood sugar moves through the day. It works as a blood glucose tracker, a diabetes diary, and a printable sugar level log all in one.

SEE YOUR TRENDS
The trends screen turns your entries into a clear chart with your personal target range shaded in, so you can see your time in range at a glance. Check your 7, 14, 30 and 90-day averages and watch your progress over time.

A REPORT YOUR DOCTOR CAN USE
Export a clean PDF or CSV of your blood sugar log for any date range and share it straight from your phone. No subscription, no account, just a proper glucose report for your appointment.

PRIVATE BY DESIGN
Your blood sugar data never leaves your phone. There is no login, no cloud sync, and nothing sold or shared. Switching phones? Use the built-in backup file to move your logbook across.

FREE, WITH AN OPTIONAL ONE-TIME UPGRADE
The full logbook, logging, charts, time in range, reminders and PDF/CSV export, is free. If you'd like to remove ads, add extra profiles for a family member you care for, and unlock custom reports, you can buy Pro once. No subscription, ever.

Please note: Blood Sugar Log is a personal tracking tool, not a medical device. It does not measure your glucose and does not give medical advice. The estimated A1c is an estimate calculated from the readings you enter, not a lab test. Always talk to your doctor about your care.