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Doselight schedules notifications on your iPhone for each dose time, up to a week ahead. They work without internet and without an account. Opening the app now and then keeps the schedule topped up. Snooze moves one reminder; changing a day-part time in Settings moves everything at that time.

Allow notifications in iPhone Settings → Notifications → Doselight → Allow Notifications. Then, in the app, Settings → Reminders → Send a test reminder checks it in a few seconds. Focus modes and Scheduled Summary can hold notifications back.

In the app, Settings → Delete all data. Deleting the app removes everything, too. Nothing is stored anywhere else, so that's all there is to it. If your iPhone is backed up to iCloud or a computer, that backup holds a copy until it's replaced. Privacy policy →

Concentration is powder ÷ water: 12 mg ÷ 1.2 mL = 10 mg/mL (10,000 mcg/mL). On a U‑100 insulin syringe one unit is 0.01 mL, so 250 mcg = 0.025 mL = 2.5 units. Doselight also shows whether that lands on a mark of your syringe and suggests a water amount that makes the dose a whole unit. Always verify with your label and prescriber.

Pick 0.3, 0.5 or 1 mL U‑100 insulin, 1 mL tuberculin or 3 mL when you mix a vial, or later in the item. Tuberculin and 3 mL syringes are read in mL rather than units.

No. Doselight has no account or server, so there is nothing to sync through. Your data stays on the iPhone where you entered it.