Keeping a consistent blood glucose log sounds simple in theory, but most tracking apps bury the experience under logins, subscriptions, or cluttered dashboards. I wanted something that gets out of the way and just records the number — with enough context to actually be useful.
I built this app because I kept running into the same problem: existing tools either did too little (a plain notes app) or too much (full-blown health platforms that felt like overkill for daily self-monitoring). There was no middle ground that handled the nuance of when a reading was taken — fasting, pre-meal, two hours post-meal — which is critical for understanding whether a value is actually within a healthy range.
The app, originally named 혈당 다이어리 in Korean, launched first on Android, and I’m glad to say it’s now available on iOS as well. Everything that made the Android version useful carries over intact.
What it does
- Time-of-measurement classification: Log readings as fasting, pre-meal, 2-hour post-meal, bedtime, or random. Because normal ranges differ by moment, the app automatically applies the right threshold to each entry and labels it accordingly — from severe hypoglycemia all the way up to severe hyperglycemia.
- Trend chart with target range: A smooth line chart visualizes how your glucose moves over time. A 70–180 mg/dL target band is overlaid so you can spot patterns at a glance without doing mental math.
- Estimated A1C (eA1C): After 14 or more days of readings, the app calculates an estimated HbA1c using the American Diabetes Association’s official average-glucose conversion formula. It’s a useful self-monitoring reference between lab visits — not a replacement for them.
- KDA and ADA classification standards: You can switch between the Korean Diabetes Association (2023) and the American Diabetes Association (2026 Standards of Care) guidelines. The labels update, but your raw readings are always preserved exactly as entered.
- Context tags and reminders: Tag readings with built-in context labels — post-exercise, after alcohol, stressed, tired, after insulin, and more — or create unlimited custom tags. Set up to three daily reminders on a per-day-of-week schedule, all processed on-device with no internet required.
- CSV export and JSON backup: Share a clean CSV with your doctor or export a full JSON backup when switching devices. All data lives in local SQLite storage — no account required, no data ever leaves your phone.
Who this is for
This app is built for anyone managing or monitoring blood glucose — whether you have a diabetes diagnosis, are in a pre-diabetic range, or simply want to track how diet and lifestyle affect your readings over time. It supports both Korean and English, with automatic system-language detection, so it’s equally usable whether you’re in Seoul or San Francisco. Dark mode is included, and because everything runs locally, it works fine on a plane or in areas with no connectivity.
One important note: this is a self-monitoring diary, not a medical device. The classification labels and eA1C estimate are reference indicators. Always consult your doctor before making any treatment or medication decisions based on your readings.
If you’ve been looking for a no-nonsense glucose log that respects your privacy and handles the time-of-day nuance properly, give it a try. Search for it on the App Store and let me know what you think — feedback from real users is what shapes the next version.
App Store에서 다운로드: 혈당 다이어리 – 당뇨 관리 기록
Android(Play Store)에서도 다운로드: 혈당 다이어리 – 당뇨 관리 기록
Official page: reactiveworks.dev/apps/6765825106
Update history: ahngo13.github.io
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