Free Tools

The tools, all in one place

Small things that answer a question and get out of the way — including two that read your blood panel back to you. No account, no logging, nothing stored. Add them to your phone and they work without signal.

Put these on your home screen. They will open like an app and keep working offline.

Lab results

HbA1c to average glucose

Turn the percentage on your lab report into the number your meter speaks. Both units.

Open → Units

mg/dL ↔ mmol/L

American readings into the rest of the world's, and back. With a quick-reference table.

Open → After meals

Post-meal walk timer

Ten, fifteen or twenty minutes. Start it as you push the plate away. It beeps when you are done.

Open → Context

Time in range

Where one reading actually sits — and why the trend matters more than the number.

Open → Sleep

Caffeine cutoff

Your last coffee, worked back from your bedtime. Sleep is a blood sugar lever most people ignore.

Open → Blood panel

HOMA-IR

Fasting glucose and fasting insulin into an insulin resistance score — plus why there is no universal cutoff.

Open → Blood panel

Metabolic syndrome check

Your five numbers against the criteria seven organisations agreed on. Population-specific waist cut points.

Open → Two minutes

The villain quiz

Ten questions to find the everyday habit doing the most damage to your levels.

Start →

How to install them

This is not an app store download — there is nothing to approve, update or delete. Your phone simply saves the page as an icon.

iPhone and iPad: tap the Share button in Safari (the square with the arrow), scroll down, tap Add to Home Screen, then Add.

Android: tap Install above, or open Chrome's menu and choose Install app or Add to Home screen.

Desktop: look for the install icon at the right-hand end of the address bar in Chrome or Edge.

Once it is on your home screen the tools open full-screen, without the browser bars, and keep working with no signal — useful in a supermarket aisle, a clinic waiting room, or anywhere the coverage drops out.

What these tools do not do

They do not log anything. There is no account, no sync, no history, and nothing you type is sent anywhere — every calculation happens on your own device, in your own browser. That is a deliberate choice, not a missing feature: a glucose log is medical data, and storing it would mean asking you to trust us with it.

They also do not diagnose, and they do not replace the targets your care team has set for you. They are arithmetic and context — the sort of thing a good clinician does on the back of an envelope while explaining a result.

If you want the reasoning behind them, that is what the articles are for. Start with CGM Basics or Walking After Meals, or browse everything on the resources page.

Educational tools only — not diagnostic tools, not medical advice, and not a substitute for the guidance of your healthcare team. Nothing you enter is stored or transmitted.