Last updated 11 June 2026

Privacy

Nicutools is built so a clinician can use it at the bedside without sending anyone’s data anywhere. This page describes exactly what does and does not happen when you use the website or the iOS app.

The short version

• No patient data is collected or transmitted. Every calculator runs entirely on your device. Inputs and results are never sent to a server.
• No accounts, no sign-in, no tracking across calculators.
• The website uses Google Tag Manager for page-view analytics only. The form values you type, the results that are displayed, the buttons you tap inside a calculator — none of that is captured.
• The iOS app contains no analytics at all.

What we store on your device

Both the website and the iOS app remember a small amount of state so the experience persists between visits. This data stays on your device.

• Theme preference — dark / light / system.
• Unit preferences — kPa or mmHg for pressure; metres or feet for altitude.
• Recent calculators — the last few calculators you opened, so they appear in a Recent row on the home screen.
• Favourite calculators — the calculators you marked with the star icon.
• Disclaimer acknowledgement (iOS app only) — a flag noting that you have read and accepted the healthcare professional disclaimer.

On the website this is stored in your browser’s localStorage. On the iOS app it is stored in the app’s sandboxed local storage. Clearing your browser data or uninstalling the app removes it.

What we never store

• Names, dates of birth, or any other identifying details.
• Calculator inputs (weights, gestational ages, lab values, ventilator settings, anything you type into a form).
• Calculator results.
• Photos, files, contacts, or any data outside the app.

Website analytics

The website loads Google Tag Manager (container GTM-NG8NTM9) to record aggregated usage information:

• Which pages are viewed and the order they are visited in.
• Standard browser and device information (browser version, OS, screen size, approximate region).
• Referring URL when you arrive from a link.

This information is used to understand which calculators are popular and to improve the site. It is not linked to a personal identity and it is never combined with calculator inputs or results, because those values never leave your browser. Google’s handling of this data is governed by their own privacy policy.

Usage counters (nicutools.org)

The website also sends anonymous usage counters to stats.nicutools.org, a service we run ourselves. It records only two things:

• That a calculator was opened, and which one.
• That a calculator produced a result — recorded once per visit, never per keystroke.

Each record contains the calculator’s short name (for example oxygenation-index), the app version, the word web, and a timestamp. A two-letter country code is derived from the network connection itself; it is never sent by the app. Nothing else is transmitted, and the calculator’s short name is drawn from a fixed internal list — there is no way for a value you type to be included.

No IP addresses, browser or device details, user identifiers, or cookies are stored. The counters cannot be linked to you, to a session, or to each other. If you are offline the counters wait in your browser and are sent on a later visit.

The iOS app contains no analytics SDK and makes no analytics calls.

Network calls

The website makes the following network calls on a typical visit:

• Loading the page itself from nicutools.org.
• Google Tag Manager and the resulting Google Analytics calls (described above).
• Anonymous usage counters to stats.nicutools.org (described above).

The iOS app makes the following network calls:

• None during a calculation. All calculators are pure local functions.
• If you tap the “Monitor Simulator” tile on the home screen, the in-app browser loads nicuvitals.nicutools.org — a separate teaching tool. Its privacy posture is described on that site.
• Standard App Store mechanisms (Apple handles purchase, receipt validation, and update delivery; we do not see your Apple ID or payment information).

Children

Nicutools is for qualified healthcare professionals and is not directed at children. It collects no personal data from anyone.

Changes to this policy

If anything material changes — analytics behaviour, or a feature that transmits data — this page and the date at the top will be updated. Changes describe new behaviour only; they are never applied retroactively to an earlier visit.

Contact

Privacy questions: [email protected].