Vial. Last updated 14 September 2026.
Vial keeps what you enter on your device. There is no account, no sign-in, no server of ours, no sync and no analytics.
Every vial, pen, label, note, dose entry and calculation you enter is stored in a database on the device itself, and is read only by the app. None of it is transmitted anywhere. If you delete the app, or lose the device, that record is gone unless you exported it first. Export and import, as CSV and JSON through the iOS share sheet, are free at every tier, and the exported file goes wherever you send it and nowhere else.
Purchases, and nothing else. Vial uses Apple's App Store for payment and RevenueCat, Inc. as its purchase layer. To tell the app whether a purchase is active, RevenueCat receives the transaction and a randomly generated identifier for the installation. It never receives a vial, a pen, a dose entry, a label, a note or any figure the app calculated: the app's purchase code cannot reach them, and an automated test in the source enforces that. RevenueCat's own privacy policy is at revenuecat.com/privacy.
Apple's handling of the payment itself is governed by Apple's privacy policy. We never see your payment details.
Nothing. There is no analytics, no advertising, no crash reporter, no tracking, and no profile of you anywhere. We cannot identify you, and we hold no database of users. Nothing is sold or shared, because there is nothing to sell or share.
Vial is rated 17+ and is not directed at children. We knowingly collect nothing from anyone, of any age.
Because your records never leave your device, you exercise them directly: export them at any time, or delete the app to erase them. There is nothing for us to hand over or delete on your behalf. For purchase records held by Apple or RevenueCat, write to the address below and we will pass the request on.
If this policy changes, the date at the top changes with it, and the previous wording is superseded from that date.