Coming to the App Store

You see the number. Nobody tells you why.

Dia turns your glucose into a state in plain words, like Steady or Falling Fast, and tells you the reason in a sentence. Made for every type of diabetes.

One email, on November 14, when Dia is live. Free for one month, then $59.99 a year or $8.99 a month.

iPhone & Apple Watch Dexcom, Libre & Apple Health Light & dark

See it
Dia’s Today screen. A glowing green bar across the top, then “Good morning”, the word Steady and “for the past hour”. Below, a sentence explaining that the 4u insulin from 70 minutes ago is at or near peak activity, three tags (Insulin peaking, Post-meal rise, Moderate exercise), and a six-hour curve with meal, walk and dose markers, glowing green with a soft fill beneath it. Under the curve, a Morning Brief row, then today’s time in range: 76%, with 3% below and 21% above, and the week at 82%.

The idea

187 mg/dL is a number.
“Steady, for the past hour” is an answer.

Eight state words, and how long you’ve been in one. That’s the glance.

Why Dia

The number was never the hard part.

Your CGM buzzes at 3 a.m. You squint at a number and an arrow, then lie there working out why. Dinner, the walk, the bolus, bad sleep? That’s one of 288 readings a day, and you’ve been solving each one from memory. Dia keeps track of the insulin still working, the meal, the walk and last night’s sleep, then says what they add up to.

Instead of decoding

You open it and already know.

Steady, for the past hour. Then the reason, in a sentence: “The 4u insulin from 70 minutes ago is at or near peak activity… Drops can come on fast in the next 30–60 minutes.” No arrow to interpret, no yesterday to compare against from memory, and no big number waiting to make you feel bad. The curve below it is the one place Dia plots real values, because a six-hour shape is worth reading.

Screenshot: Dia’s Today screen. A glowing green bar across the top, then “Good morning”, the word Steady and “for the past hour”. Below, a sentence explaining that the 4u insulin from 70 minutes ago is at or near peak activity, three tags (Insulin peaking, Post-meal rise, Moderate exercise), and a six-hour curve with meal, walk and dose markers, glowing green with a soft fill beneath it. Under the curve, a Morning Brief row, then today’s time in range: 76%, with 3% below and 21% above, and the week at 82%.

Dia’s Today screen. A glowing green bar across the top, then “Good morning”, the word Steady and “for the past hour”. Below, a sentence explaining that the 4u insulin from 70 minutes ago is at or near peak activity, three tags (Insulin peaking, Post-meal rise, Moderate exercise), and a six-hour curve with meal, walk and dose markers, glowing green with a soft fill beneath it. Under the curve, a Morning Brief row, then today’s time in range: 76%, with 3% below and 21% above, and the week at 82%.

After the spike

The spike you couldn’t explain gets a name.

Dia looks across your own days for what reliably moves you, then says it plainly. High-carb meals: on the four of the last seven days you had them, you spent about three more hours a day above range than on the days you didn’t. Patterns start to appear once Dia has a few days of your data to work from.

Screenshot: Dia’s Patterns screen. A time-in-range card shows 82% in range, an hour more in range a day than last week, with 12% above and 6% below and a glowing line across the last seven days. Under “Patterns detected” are high-carb meals (3 hours more above range a day, on 4 of 7 days), heat (2 hours more, on 2 of 7 days) and stress or low HRV (1 hour more).

Dia’s Patterns screen. A time-in-range card shows 82% in range, an hour more in range a day than last week, with 12% above and 6% below and a glowing line across the last seven days. Under “Patterns detected” are high-carb meals (3 hours more above range a day, on 4 of 7 days), heat (2 hours more, on 2 of 7 days) and stress or low HRV (1 hour more).

When you’re wondering

Ask the question you keep asking yourself.

“Why do high-carb meals affect me so much?” “How does sleep change my insulin sensitivity?” Dia answers from your own logs, your sleep and the weather where you are, instead of handing you a general article about carbs. It never tells you what to dose. That stays between you and your care team.

Screenshot: Dia’s Ask Dia screen, headed “What’s on your mind?”, with a line saying it never covers dosing and four suggested questions: high-carb meals, heat, sleep and insulin sensitivity, and exercise. The message box at the bottom reads “Ask Dia anything…”.

Dia’s Ask Dia screen, headed “What’s on your mind?”, with a line saying it never covers dosing and four suggested questions: high-carb meals, heat, sleep and insulin sensitivity, and exercise. The message box at the bottom reads “Ask Dia anything…”.

Instead of a spreadsheet

Logging takes seconds, and then it pays you back.

Photograph the plate or scan the barcode, tap the dose, or say a walk out loud to your Apple Watch. Your day builds itself into a timeline, and each entry makes tomorrow’s explanation more about you. Log as much or as little as you like. The state comes from your sensor, and the reasons get sharper with what you add.

Screenshot: The lower half of Dia’s Today screen. Four dials, for sleep (7h 15m), steps (6,840), HRV (47 ms) and resting heart rate (64 bpm), each with a marker showing where today sits against the person’s usual. Under them is Today’s Log, a timeline of the day: a coffee, 4u rapid, a chicken bowl and a 30 minute walk.

The lower half of Dia’s Today screen. Four dials, for sleep (7h 15m), steps (6,840), HRV (47 ms) and resting heart rate (64 bpm), each with a marker showing where today sits against the person’s usual. Under them is Today’s Log, a timeline of the day: a coffee, 4u rapid, a chicken bowl and a 30 minute walk.

Vitals, in context

Your sleep, heart and steps, against your own usual.

Four dials, each with a marker for where today sits against the last two weeks of you, never against anyone else’s average. Tap one for its history and a plain note on what it is and why it matters for diabetes.

Sleep

7h 15m

Steps

6,840

HRV

47 ms

Resting HR

64 bpm

Sample data. Dia describes what has come before what in your own days, not what will happen, and it never tells you what to dose.

Also in it

Morning to night.

A brief before the day starts

What your night did, how you slept, what the weather is about to do, and the one thing worth keeping an eye on.

A review after it ends

Day in Review lays your day’s states against everything you logged and everything your sensors noticed, so you can see what mattered.

Your week, as a story

A tap-through recap of your week: time in range, day by day, your best and hardest day, and what Dia noticed. Keep it to yourself or share the page.

On your wrist and Lock Screen

Widgets, a Watch app with complications and a Live Activity in the Dynamic Island put your state and trend one glance away. Tap the Watch graph for 6, 12 or 24 hours.

Meals by camera or barcode

Point at the plate or scan the pack and Dia estimates what’s on it. If it gets one food wrong, tap that food and scan the right one.

A report your clinic can read

One PDF with the standard CGM summary your clinic expects, built on your phone and shared by you. You preview it first, and it carries the real values, since those are what your clinic reads.

Finger-sticks work too

No CGM? Check-in mode shows your checks as they are, with no line guessing at the hours between, and reads your week from them.

Light, dark, and your units

Light, dark or automatic, in mg/dL or mmol/L, at the text size you set. A reading at your sensor’s limit says LOW or HIGH, not a made-up number.

How it works

Set it up once, then just glance.

01

Connect what you already wear

Dia reads glucose, sleep, heart rate and activity from Apple Health. It also connects straight to Dexcom Share and LibreLinkUp.

02

Live your day

Log what’s worth logging: a meal by photo, a dose, a walk. Your sensors and Apple Watch cover the rest, and weather and altitude arrive on their own.

03

Dia explains it back

Every state comes with a reason. Every morning and every night you get a short read on what happened. Week by week, the reasons get more specifically yours.

Your data

Your readings stay on your phone.

It’s your health data, so the rules are short and there are no exceptions.

  • Dia reads from Apple Health and never writes to it. Your health record stays yours.
  • Your glucose readings stay on your phone. The clinic report is built there too and shared by you, and it never passes through Dia’s servers.
  • No ads, and your data is never sold or used for advertising.
  • Analytics are anonymous and carry no glucose values or health data. You can delete everything from inside the app, any time.

Straight answers

Before you hand over an email.

Do I need a CGM?

No, but it’s where Dia works best. It connects to Dexcom through Dexcom Share and to FreeStyle Libre through LibreLinkUp, and reads glucose, sleep, heart rate and activity from Apple Health. Dexcom delays what it writes to Apple Health, so the direct connection keeps your curve current. If you use a finger-stick meter, Dia has a check-in mode that shows your checks as dots, with no line guessing at the hours between. Dia isn’t affiliated with or endorsed by Dexcom or Abbott.

Does it tell me what to dose?

No. Dia explains what’s going on and never says how much insulin to take or when. It doesn’t send low or high alerts either, and it doesn’t replace your CGM, your meter or your care team.

Where do I get it?

On the App Store, for iPhone, from November 14. The Apple Watch app comes with it. Leave your email at the top of this page and we’ll write once, the day it’s live.

What will it cost?

The first month is free, and it’s the whole app. You add a payment method to start and can cancel any time from your iPhone’s Settings in about four taps. Cancel at least 24 hours before the month is up and you’re not charged. We’ll remind you a week ahead with the date and the amount. After that it’s $59.99 a year (about $5 a month) or $8.99 a month, renewing until you stop it.

There’s no permanent free version, on purpose. Dia gets more useful in week four than on day one, so we’d rather you judge the whole thing. No ads, and your data is never the product.

I was in the beta. What do I get?

Thank you. Beta testers get three months free on the App Store. We’ll email you an offer code, so use the address you gave us when you joined. We read everything you sent, and a lot of what’s in the app now started with one of your messages.

Is there an Android version?

Not yet. Dia is on iPhone and Apple Watch for now, partly because the Watch app, widgets and Live Activity are a big part of it. We’re building for Android too, and we’ll say so here when it’s ready.

When your glucose does something odd, you’d rather already know why.

Dia gives the odd reading a plain-word state and a reason, so it arrives with its context. Coming to the App Store on November 14. Free for the first month, then $59.99 a year or $8.99 a month. Cancel any time.

One email, on November 14, when Dia is live. Nothing before it, nothing in between.