Glucose & Food Tracker

Glucose reading

Food

Describe what you ate

🧺 Build a meal from ingredients

Add each ingredient and how many grams you had (ml for drinks). "Per 100g" is the carbs figure on the label, or tap Barcode while this is open to add a product. If you already know an item's carbs, put them in "Carbs g" instead.

When

What it does

Glucose, food and notes on one timeline, so you and your doctors can see why sugar went high or low. Built first for reactive hypoglycaemia, where a meal sends glucose up and a crash follows an hour or two later.

How to use it

Open it from your home screen. No account. Your records stay on your phone unless you choose to share them.
Log in seconds. Home has quick entry for a glucose reading, a meal or a note. Type or say what you ate, photograph the plate, or scan a barcode and the label's carbs fill in. Build a meal from ingredients and pick a portion.
Tap Sync devices. One button pulls in a FreeStyle Libre sensor and an Accu-Chek meter over Bluetooth. Dexcom connects through Dexcom's own sign-in. Add each sensor under My devices.
Answer "what happened?" When the sensor shows a rise or drop with nothing logged before it, the app asks. A couple of biscuits, a whisky after the footy, or a sensor glitch: whatever the answer, it goes on the record.
Read the pattern. Readings → Graph shows peaks, troughs and low spells, with finger-pricks as diamonds and meals along the bottom. Readings → Meals shows what each meal did over the next five hours.
Take it to the doctor. Export prints a clean report for the dates you choose. Nothing leaves your phone unless you send it.

Why it helps

The crash is on the record. It is hard to describe a low to a doctor from memory.
People forget. Sensors don't. The app notices what you didn't log and asks.
One timeline. Your devices, meals and notes together, not in separate apps.
You stay in control. Local by default, no account, shared only when you decide.
Plain facts. It shows what happened. It never tells you what to eat or how much insulin to take. That stays between you and your doctors.

Want the detail?

The full guide explains every screen with pictures, how to fit and use your sensors and meter, why food, barcodes and portions are logged the way they are, and where every fact came from.

Take your records to an appointment, or keep a copy of them. Files are made on this phone. Nothing is sent anywhere unless you choose to send it.

1 · Choose the dates

From To

2 · A report for your doctor

One printable summary of the dates above: the key numbers; every low spell with what was logged around it; each meal and what glucose did over the next five hours; finger-pricks beside what the sensor said; your notes and symptoms; the 7-day graph; and every entry. It reports facts. It never advises.

Notes for the appointment (printed at the top)

On a phone, choose Print, then Save as PDF or Share to send it. On a computer, choose Save as PDF as the printer.

3 · Spreadsheet or backup (CSV)

One row per reading, meal, note or medicine. It opens in Excel, Numbers or Google Sheets, and it is also how you keep a backup or move your records to another phone. Your medicines list goes in whole, whatever dates you chose.

What's in each column

Type: glucose, food, diary or medicine.
When: The time as it shows in the app.
Detail: The reading, meal or note in words.
Timestamp: The exact time (UTC), for spreadsheets and for restoring.
Value, Unit: A glucose reading's number and its unit.
Note: The note typed with a reading.
Text: A meal's description, or a diary note.
Source, Device: Where a reading came from, so a restored file keeps sensor readings as sensor readings.
Extra: The parts with no column of their own: a meal's carbs and ingredients, which question a note answered, and a medicine's details. Leave it as it is, so a restored file comes back whole.
A tab at the start of a cell: Some cells begin with an invisible tab. It stops a spreadsheet from treating a note that starts with = + - or @ as a formula. The app takes it off again when you restore.

Restore or move your records

Choose a CSV that was exported from this app, for example on your old phone and then sent to this one. Entries already here are skipped, so importing the same file twice never doubles anything.

CSV file from this app

A CSV holds readings, meals (with their carbs and ingredients), notes and your medicines list. It does not hold food photos, saved meals, My foods (which has its own backup), your devices or your settings.

A record of the medicines you take, in your own words or as your clinic wrote them. It is kept on this device only and goes into your report. It does not check doses or interactions, send reminders or give any advice.

Add a medicine

Medicine Strength / how much When it is taken Reason (optional) Started (optional) Stopped (leave empty if you still take it) Where this came from (optional) Date of that list (optional) Needs confirming with my nurse or doctor Notes (optional)

Products you've checked against the pack. They're kept on this phone and, once the sync passcode is saved in Settings, shared through your household food bank so every device sees the same list. Scanning on Home looks here first, then the food bank, then the public database.

Barcode (or type the numbers under it)

Name

Carbs per 100 g Sugars per 100 g

Serving size on the pack (g or mL, optional)

Use the pack's "per 100 g" (or "per 100 mL") column for carbs and sugars, not "per serving". The serving size lets the meal builder offer ¼, ½, ¾ or a full serve.

Saved (0)

Backup

Download a copy before a big shopping session, or to move your list to another device.

Restore from a backup file

Your setup

Please read: what this app is, and isn't

This app helps you record and understand your glucose, food and how they relate, and helps the people around you keep an eye out. It shows what happened. It does not diagnose, treat, or tell you what or how much to eat, and it never suggests medication or insulin doses.

Readings, carb figures and patterns can be wrong. Treat them as a guide, not the final word.
Always follow the advice of your doctor, diabetes educator or dietitian over anything shown here.
If you feel low, treat it and check with a finger-prick. Don't wait for the app.
In an emergency call 000.

General information from published medical sources — not personal advice, and not based on your own data. For anything specific to you, confirm with your own doctor. Your own Readings, once there's enough logged history, are the more accurate guide to what actually affects you personally.

Everyday eating

Nothing is strictly off-limits — the combination matters more than any single food.
Known trigger: a big hit of simple/refined carbs on their own — white bread, white pasta, white rice, pastries, sugary drinks, juice, lollies — especially on an empty stomach.
Steadier pattern: pair complex carbs with protein, fat, or fibre — wholegrains, legumes, nuts and seeds, vegetables — to soften the rise so there's less to crash from.
Smaller, more frequent meals (roughly every 3 hours) tend to work better than a few large ones.

Alcohol

Not all off the table, but there's a real mechanism at play: alcohol makes your liver prioritise breaking it down over topping up blood sugar, so it can trigger or worsen a crash on its own.
One study found a specific higher-risk combination: alcohol with a sugary mixer (their example was gin and tonic) — a starch-based drink like beer didn't provoke the same drop.
Risk increases alongside other factors — age, other health conditions, exercise around the same time.
General takeaway: drink with food rather than on an empty stomach, and be more cautious with sweet mixers and cocktails than plainer drinks.

Eating out & social occasions

Check the menu ahead of time so you're not deciding under pressure at the table.
Grilled, baked, or steamed on a balanced plate tends to beat fried or sugar-heavy dishes — most places will happily swap a side.
Don't arrive starving — skipping a meal before a dinner out is a common setup for overeating simple carbs and crashing afterward.

Sources

Glucose warning thresholds

Left blank on purpose — nothing gets colored until you set your own numbers here. For reference while you're deciding (confirm with your doctor, this app isn't recommending a value): the ADA defines hypoglycemia as below 3.9 mmol/L (70 mg/dL).

Low threshold (below this = low warning)

You can set this higher than 3.9 mmol/L (70 mg/dL) for extra personal margin — same idea as driving to your own lower speed limit — but this app won't let it go lower than that standard alert point.

High threshold (above this = high warning) Units for the numbers above

Readings display

List Graph

Date format

"Automatic" follows your phone's own region setting. Lock one in here if you want dates to stay the same regardless of what your phone does when you travel.

Automatic (follow my phone) DD/MM/YYYY MM/DD/YYYY YYYY-MM-DD

Applies to dates this app draws itself (Home, Readings, Export). The From/To date pickers on the Export screen are your phone's own native calendar control, which always shows in your phone's own format — that one isn't something a website can override.

My devices

Each physical meter or sensor you've used, with its serial number — so a sync can tell "this is your saved meter" from "this is a different one nearby," and so a new Libre sensor's start date is on record automatically when you sync, for Abbott replacement claims.

This list is a record of what you own. It does not connect anything. A meter is connected by Sync devices on a Mac or Android phone in Chrome, and its readings then reach your other devices through Keep my devices in sync.

Glucose source

Libre 2 Plus (CGM) sync

Sync passcode Remember on this device

Saving your passcode here means Sync devices on Home can pull your Libre readings without asking for it each time. Pulls roughly the last 12 hours; readings already saved are skipped, so syncing often is fine. The passcode stops anyone else who finds this site from reading your glucose.

Keep my devices in sync

Share my readings, food and diary between my devices

Off unless you switch it on. When it's on, a copy of your glucose readings, food entries and diary notes is kept in this app's private storage on Netlify, locked with the sync passcode above, so your phone, Mac and any other device you switch this on see the same records. Do this on each device. Food photos stay on the device that took them. Switching it off stops sharing from this device.

Dexcom ONE+ (CGM)

Connecting takes you to Dexcom's own sign-in page. You never type your Dexcom password into this app, and you can withdraw access from your Dexcom account at any time. Once connected, Sync devices on Home pulls new readings. Dexcom holds readings back by about 3 hours outside the US (1 hour in the US), so the newest ones arrive later than in Dexcom's own app.

Unexplained rise & drop questions

Ask me about rises and drops with nothing logged before them Rise of at least (mmol/L) Drop of at least (mmol/L) Happening within (minutes) Nothing logged in the previous (minutes)

Uses your Libre (CGM) readings only, since finger-pricks are too far apart to show a rise. For drops the app looks back 4 hours, because a reactive low usually follows a meal by 2–4 hours. These are just triggers for a question. They aren't medical limits.

Reminders

Remind me to log a reading Reminder time

Checked only while the app is open (in-app banner above). Background push notifications on an iPhone home-screen app are unreliable — this does not rely on them.

Play a sound for reminders and warnings

Plays while the app is open — a phone can't let a website override its own system notification sound, so this is a real, distinct tone from inside the app itself, not a substitute for it. Your own custom sound file is a fast-follow, not built yet.

Unit

mmol/L (default) mg/dL

Reactive Blood Tracker