VialMath
VialMath runs entirely on your device and never phones home. That's the point of it — and it has two consequences. It can't tell you when it improves, and it can't notice if you've stopped backing up. An email address is the only way round either.
Entirely optional. Nothing in VialMath is locked behind this, and the app works exactly the same without it.
What we store: your address, which of the two you asked for, and the date. Nothing from your protocol is ever sent — not a compound, a dose, a schedule, a count, or anything you have entered. VialMath itself has no way to send it: this page is on the website, not in the app, and the app makes no network call of its own. Unsubscribe any time; the link is in every email.