What this site knows about you

The short version

No ads, no tracking pixels, no selling or sharing your data, ever. The only personal information this site can hold is an email address you chose to give the updates list. Everything the tools save (packing lists, the emergency card, appointment picks) stays in your browser and never reaches a server.

The updates list

If you sign up for app updates, you give us your email address and, optionally, which mode fits you. That goes to Buttondown, the newsletter service that processes email for us, and nowhere else. Signup passes your IP address to Buttondown once so it can filter spam signups; we never store or log it ourselves. You confirm by clicking a link (so nobody can sign you up as a prank), and every email has an unsubscribe link. Unsubscribing stops the emails; if you want the record deleted entirely, ask and it's gone.

Update emails are release news only. No open tracking, no click tracking, no "we noticed you haven't opened our last three emails."

Visit counts

Page views are counted with Cloudflare Web Analytics, a cookieless counter. It tells us "the sick-day guide was read 120 times this week," not who read it. No cookies, no fingerprinting, no profile that follows you across the web. What you look up about your health is your business.

Guide feedback

At the end of each guide there's a "Was this helpful?" question. Votes are anonymous counters: a vote stores the guide name and a timestamp, nothing else. If you add a comment, we store the comment text with the guide name and timestamp, and that's the whole record; there is no account, no ID, and no way for us to connect it to you. Your browser remembers that you already answered (a small note saved on your device) so the same guide doesn't ask twice.

Tools that save on your device

The trip packing builder, the emergency card, the appointment prep builder, your mode choice, and your theme preference all save their data in your browser's local storage. That data never leaves your device and we never see it. What you type on the emergency card, including medical details, stays in your browser; printing happens locally too. Clearing your browser data erases all of it.

What never happens

No advertising, no ad networks, no tracking pixels, no third-party analytics beyond the cookieless counter above, no selling or renting data, no "trusted partners." The site runs on Vercel, which keeps standard short-lived server logs like any host; we never write email addresses or anything personal into our own logs.

The iPhone app

Everything the app knows lives on your iPhone, in the app's own database and its own folder. There is no account, no login, and no server that holds a copy. Nothing you log, write, or connect is sent to us, because there is nothing on our side to send it to.

Glucose. If you connect Apple Health, the app reads the blood glucose your CGM app already writes there, with your permission, and keeps it on the phone. It is never written back to Health, never uploaded, and never used for advertising, marketing, or any kind of profiling. You can stop the connection on the Insights screen, and turn it off entirely in the iPhone's Health settings.

The app never talks to a sensor and never talks to a sensor maker. For glucose it reads Apple Health and nothing else, which is also why it can only show what something else has already put there. Dexcom writes to Apple Health once you turn sharing on in the Dexcom app. Abbott's Libre apps do not write to Apple Health today, so if Libre is your sensor the app has no readings to show you, and everything in it that is not glucose still works.

Meals, journal, check-ins, reminders, seasons. All on the phone. Reflections on a journal entry are written by the model built into iOS, on the iPhones that have it, which means the entry never leaves the device. On an iPhone without that model there is no reflection at all rather than a copy of your entry going somewhere.

Photos and the camera. A picture you choose as your profile picture stays on the phone. The app asks for the camera only to read a barcode: it decodes the number in the live view, no image is saved and nothing is recorded. The first release has no feature that sends a photo anywhere.

The two things that do leave. Scanning a barcode sends that barcode to Open Food Facts, the open food database, to look the product up; searching for an endocrinologist sends the terms you typed to the public NPI provider registry run by the US Centers for Medicare and Medicaid Services. Neither request carries your name, your health data, or an identifier for you, and neither service gets anything else from the app. Both hold to their own privacy terms, which are at least as protective as this page for what little they receive.

Email you choose to send. The About screen has a button that opens your own mail app with a message to jake@t1dal.com, the app version and your phone model filled in where you can see them. You write it, you send it, or you close it; the app never sends an email on its own.

The install id. The app makes a random id for itself the first time it runs, with nothing about you in it. In this release nothing sends it anywhere; it exists so that a future feature that does need to tell one phone from another never has to reach for anything identifying. Deleting your data or the app removes it.

Keeping and deleting. Data stays on the phone until you delete it. Profile, Privacy and data has an export that writes everything to a JSON file you keep, and a delete that erases all of it from the phone. Deleting the app removes it too. There is no account to close and nothing for us to delete on your behalf, and if you gave a consent in an earlier version, the same screen shows the record and clears it.

Nothing in the app computes or suggests an insulin dose. If any of this changes, this page changes first, and the app asks before anything new is sent.

Questions

This is a one-person project, so privacy questions go straight to the person responsible: email jake@t1dal.com, or message @typeonejake on TikTok or @dietjakee on Instagram. If something here is unclear or you want your data deleted, that's the route.

Trademarks

Dexcom is a registered trademark of Dexcom, Inc. T1DAL is not affiliated with or endorsed by Dexcom. Other product names mentioned in guides belong to their respective owners and appear for description only.