Privacy

Two different things: the app on your device, and this website.

The app

The app runs on your device. Using it asks for no account to create and no email address, and no payment details are stored by the app itself.

Premium on a second device is the one exception, so here it is plainly. To carry one subscription to your other devices you give the app your email address, we send a six digit code to it, and you type that code in. The address is what links those devices to each other. It is the only personal detail we hold, we do not send anything else to it, and deleting the account from the app's settings deletes it. Everything else on this page is unchanged by that: the address identifies the subscription, and it cannot read your history, because nothing we hold can.

You can also sign in with Apple, Google or Microsoft instead of typing a code. The provider tells us your email address and confirms it belongs to you. We ask for nothing else: no name, no contacts, no profile picture, and we keep only the address. If you sign in with Apple and choose Hide My Email, the only address we ever see is the relay address Apple makes for you.

Payments on this website, in the Mac, Windows and Linux apps, and on Android when you choose to pay by card instead of through Google Play, are handled by Stripe. Stripe receives your card details and your email address. We never see your card number. When an Android purchase goes through Stripe, Google requires us to report the sale to Google Play: we send the price, the currency, the date and Google's own reference for your choice. Nothing you log in the app goes to Stripe or to Google.

The steps, and what deletion removes and keeps, are on the delete your account page.

Without a subscription, nothing you log ever leaves your device.

If you subscribe, your check-ins can follow you between iPhone, iPad, Mac, Android, Windows and Linux. They are encrypted on your device before they leave it, with a key that is made on your device and is never sent to us. We store only the encrypted result, so we cannot read your history, and neither can anybody who obtains a copy of what we store.

That key is shown to you as a recovery code, in the app's settings. It is what lets a second device read your history, and it is the only thing that can. If you lose every device you own and have not kept the code, we cannot recover your history for you, because we do not hold the means to. That is the same fact as the sentence above, stated from the other side.

Android's Auto Backup also backs your data up to your own Google account and restores it on a new device. That is your own account, and we cannot read it either.

If the app crashes, it asks the next time it opens whether to send a crash report, with Send, Don't send and Always send. A crash report says what crashed, the app version and the device model, such as "iPhone17,1, iOS 26.0". Nothing you have logged is in it, and nothing is sent unless you say so.

Report a problem, in the app's settings, sends what you type there, a screenshot if you add one, and your email address if you give it so we can reply, with the same app version and device model. Crash reports and problem reports, screenshots included, are deleted after 90 days.

This website

When you press a link to an app store or a download button on this site, the site counts the press: which store or download, and which page it was on. If you came from the app's Visit the website link, the site also notes which app (iPhone or iPad, Mac, Android or Windows) for that visit, and a website purchase records the same. Nothing about you goes with it, and it sets no cookie.

As of August 2026, thelongviewapp.com is static pages plus one analytics tool, Microsoft Clarity. Clarity sets cookies and records how pages are used: which links get clicked, how far people scroll, and a replay of that movement through the page.

What it cannot capture is anything you type. Clarity masks the contents of input boxes in every one of its modes, and that cannot be switched off, so the age, sex and smoking history you enter into the calculators is never recorded.

The math itself happens on your own device: there is no server working out your numbers. The results are hidden from Clarity too.

That second part was added on purpose. Your results appear as ordinary sentences on the page, outside any form box, and an earlier version of this site did let those figures reach Clarity. They are now hidden from it.

Clarity is used to see which pages are worth keeping and where they confuse people. If you would rather not be included, browser tracking protection and most content blockers stop it, and the site works exactly the same without it.

The hosting provider keeps standard server logs, the kind almost every website keeps (things like IP address, requested page and timestamp), to operate the site and watch for abuse.

This section describes the site as it stands today. If that changes, for example if an analytics tool is added later, this page will be updated to say so at the same time.