iPhone Works offline No account needed

Fast glucose converter and a private measurement log.

GlucoConvert instantly converts blood sugar between mg/dL and mmol/L in both directions, colours the result by clinical range, and keeps a simple diary of measurements with notes and insulin doses.

Everything stays on your device, works offline, with reminders and an export for your doctor. No ads, no sign-up.

Coming soon

7‑day free trial, then €15/year — an auto‑renewing subscription billed by Apple. Cancel any time. iPhone only.

The GlucoConvert app converting 5 mmol/L to 90 mg/dL, flagged as in range

Try it here

The same conversion, in your browser

Type a value and switch direction. The app does this offline, remembers your last unit, and can save the reading to your diary with a note.

In range — 70–180 mg/dL · 3.9–10.0 mmol/L

Elevated — 180–250 mg/dL · 10.0–13.9 mmol/L

Low or high — under 70 or over 250 mg/dL

Reference bands only (ADA/EASD Time‑in‑Range). Your personal targets are set by your doctor and may differ.

What it does

Six things, done properly

Both directions

mg/dL → mmol/L and mmol/L → mg/dL, each on its own tab. Results appear as you type.

Clinical ranges

Green for in range, orange for elevated, red for low or high — readable at a glance.

Diary with context

Save a reading with a note about your meal and an optional insulin dose in units.

Calendar history

Every day with measurements is marked. Tap a date to see its readings and open any one of them.

Reminders

Set your own measuring times — morning, afternoon, evening — and add as many as you need.

Private, with an export

Data lives on your device and works offline. Export as CSV or plain text to share with your doctor.

Screens

Four taps deep, at most

Entering 241 mg/dL, converted to 13.4 mmol/L and flagged elevated — Convert as you type, with the range flag underneath.

Calendar history for August 2026 with the day's readings listed — A month at a glance, then the readings for the day.

A single reading of 6.1 mmol/L with its time and note — One reading in both units, with its note and time.

Reminder times and preferences in the account tab — Reminders, language, appearance and export in one tab.

Price

Try it for a week, then €15 a year

No ads, no accounts, no tracking, no data sent anywhere. Payment, billing and cancellation are handled entirely by the App Store.

Coming soon

€15 / year

after a 7-day free trial

Conversion in both directions, offline
Unlimited diary entries with notes and insulin
Calendar history and reminders
CSV and text export for your doctor
Optional sync to your own iCloud

The 7-day trial gives full access. Afterwards a subscription is required to continue using the app. €15 per year, charged to your Apple Account at confirmation of purchase and automatically renewed each year unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple Account settings. Prices in other currencies are set by Apple for your storefront. See the Terms and Privacy Policy.