Blood sugar, food
and insulin.
Always at hand.

1. Large number — the latest glucose reading

This is the latest sensor reading received. These examples use mmol/L. The arrow beside it shows the direction of change; the time below shows when the reading was taken.

See glucose on your home screen and check the reading time to judge how recent it is.

2. The arrow: which way blood sugar is moving

An up arrow means a rise, a down arrow means a fall, and a right arrow means little recent change. Both examples show two downward arrows, indicating a rapid fall.

The same reading can be followed by a rise or a fall. The arrow describes recent movement; the forecast below is a separate calculation about the future.

3. 6, 12, 18 or 24 hours: choose how much history to see

These buttons select the time shown on the main graph. These screenshots have the six-hour view selected.

Use a shorter view for recent meals and injections, or a longer view for the whole day. The lower graph still shows the last hour.

4. Main graph — glucose history

Time runs from left to right. Green shows readings from 4 to 10 mmol/L, yellow readings above 10, and pink readings below 4. The colored areas highlight values outside these limits.

These are the widget graph’s color thresholds. Your personal targets for calculations are set separately in your profile.

5. Numbers on the right, time along the bottom

The right-hand numbers show the highest and lowest blood sugar values in the displayed graph. Times appear below the graph.

See how high or low blood sugar went and when it happened. These numbers are not your personal target values.

6. Syringe markers on the main graph

Mode: insulin pens

In the pen examples, syringe symbols mark recorded insulin injections. Their position in time helps you relate an injection to the changes that followed.

You do not have to remember the injection time. A marker is a record of an event, not a suggestion to inject again.

7. Thin orange line — insulin action over time

In the narrow strip below the main graph, the orange line estimates the action of rapid insulin already taken. The modeled effect builds after a delay, then fades. The effects of multiple doses are combined into one curve.

IOB estimates the amount remaining in units; this line shows how insulin action changes over time. Its height is neither a new dose nor a measured insulin effect.

8. IOB — active insulin in units

Insulin on board is an estimate of earlier rapid insulin still counted as active. “U” means insulin units. For example, IOB 1.1 U is an estimate of active insulin remaining, not an instruction to take another unit.

The value depends on the available dose history and configured action duration. It may differ from AAPS IOB because Dia.best can recalculate it using its own model.

9. Active carbs: food still being absorbed

Also called carbs on board, or COB, this estimates remaining carbs from food already recorded. It is the value beside the bread symbol, not an amount suggested for you to eat now.

A previous meal may still affect blood sugar. This value helps account for that food alongside insulin.

10. TIR — readings in range over 24 hours

Time in range is estimated from the available readings in the previous 24 hours: the percentage between 3.9 and 10 mmol/L (about 70–180 mg/dL). For example, 84% means 84% of those readings were in range.

This covers a rolling 24-hour window, not just today since midnight. Missing readings leave gaps in what the percentage can describe.

23. Blue line — pump background insulin action

Mode: insulin pump

In the same narrow strip, the blue line estimates the action of background insulin, including basal delivery and temporary changes when their history is available.

See background action alongside the orange bolus curve. This blue line is not shown in the pen examples.

11. Forecasts with and without an action

The two rows estimate blood sugar in 30 and 60 minutes. The first is calculated without an additional action; the second includes the action considered in the suggestion. Sometimes they match.

Compare possible outcomes and notice a potential fall or rise earlier. A forecast uses the available data; it does not promise an exact future reading.

12. The yellow line: the current suggestion

The system may suggest waiting, taking carbs when it predicts a fall, or calculate insulin when a correction is needed. “Wait” means the calculation is not suggesting a new action at that moment.

The suggestion brings together blood sugar, food and insulin. It depends on your settings and complete records; compare it with fresh readings and how you feel.

13. Food photo — open photo analysis

The button opens the app’s food-photo flow directly. It estimates carbs from the photo; after checking the portion and entering your personal settings, you can use the insulin calculation.

Start from the widget without finding the feature in the app. Check the food and portion size because a photo provides an estimate.

14. Grams, minus, plus and Log — record carbs

Choose the carbs you ate using minus and plus, then tap Log. Tapping the number opens a small dialog where you can type and save the amount.

Record food from your home screen without navigating to the dashboard. The number selected for logging is separate from any system suggestion.

15. Units and Log — record insulin already taken

Mode: insulin pens

Pen mode adds a row for a dose you have already taken. Use minus and plus, or tap the number to type it. Use the button beside the insulin amount to save the record.

The record is used in your history and later calculations. The widget does not inject insulin or send a delivery command to a pump.

24. Pump doses — received through Nightscout

Mode: insulin pump

When AAPS or another compatible system uploads pump doses to your connected Nightscout, Dia.best receives those records automatically. The available history is used for dose markers and estimated insulin action.

You do not need to manually duplicate doses already uploaded by the pump system. The data source and synchronization must be configured.

25. Tap the widget background — open the dashboard

Tap outside the widget’s individual buttons to open the app for more detail. Time-range, logging and photo buttons keep their own actions.

Keep a quick overview on your home screen, with full history and settings available in the app.

16. Time — when the latest reading was taken

The time inside the widget corresponds to the latest glucose point received for the graph. It is different from the current clock in the phone’s status bar.

If this time is behind the phone’s clock, the displayed reading is older. Connection warnings may also say how long data has not been updated.

17. Battery and charging symbol — the source phone

The percentage inside the widget is the battery level reported by the data source. With Nightscout, this is usually the phone uploading readings. A plug means the source reported that it is charging.

It may be your child’s phone rather than the phone showing the widget. A dash means the battery level is unavailable, not 0%.

18. Pump timer — time since the infusion-site change

Mode: insulin pump

The counter shows elapsed time since the recorded infusion-set or pump-site change. It uses the Nightscout Site Change event, with the saved start date as a fallback. The example “0d10h” means 10 hours.

It describes the current site or supply based on the recorded date. It is not the pump’s lifetime or the amount of insulin left in its reservoir.

19. Sensor timer — time since insertion

The counter shows elapsed time since the sensor was inserted. For example, “5d19h” means 5 days and 19 hours, as in both examples. It uses the Nightscout Sensor Change event or the saved date in settings.

Keep track of the insertion date. A dash means no date is available; an incorrect saved date gives an incorrect age.

20. Last injection: the dose and how long ago

Mode: insulin pens

In pen mode, this row shows the last recorded injection and the time since it. The pen example shows 0.1 units, 36 minutes ago.

Recall a recent injection and avoid recording it twice. This is a past event, not a suggestion to repeat that dose.

21. Last 60 minutes — a closer view of recent glucose

The bottom graph shows the last hour of glucose, independently of the 6-, 12-, 18- or 24-hour range above. The right-hand numbers are the highest and lowest values in this window; the last dot is the latest received reading.

Yellow and green segments here describe glucose. Insulin action is shown higher up, in the separate narrow strip under the main graph.

22. Labels under the hour graph — carbs and insulin

Yellow labels in g show recorded carbs. Blue labels in U show insulin taken. A lilac SMB label identifies an automated microbolus when that event type is supplied. A leader line connects the label with its time position.

These are past events, not new instructions. Nearby records may be grouped to keep labels readable; a label can therefore show the sum of multiple events.