Privacy Policy

Vialog · last updated 9 August 2026

Vialog keeps your record on your phone. There is no account, no sign-up, no email, and no server of ours that your data is sent to. This page explains the few exceptions, in plain words.

What Vialog stores, and where

Everything you enter — compounds, vials, doses, injection sites, observations, notes, measurements, reminders and settings — is written to a database file on your own device. It is not uploaded, synchronised or mirrored to us. We operate no backend and hold no copy of your record.

Backups and exports are yours, and they only move when you move them

• Export a copy hands you a file through your system's own share sheet. Where it goes is entirely your choice, and it goes there directly — never through us.
• The app's own backup copy is written to storage on your device, or, if you choose a cloud folder, to your own account with that provider. We have no access to it. Once a file sits in your Google Drive or iCloud, that provider's own privacy policy governs it, and only you can reach it.
• The backup file is not encrypted by Vialog. It is a plain text file that anyone who can open the folder can read, so put it somewhere you are happy for it to live. On the phone itself it sits in the app's own storage, which the operating system already protects with full-disk encryption.

Crash reports

Vialog uses Firebase Crashlytics (Google) so that a crash on a phone we do not own can be found and fixed. When the app crashes it sends: the device model, the operating system and app version, the sequence of code that failed (a stack trace), and a randomly generated installation identifier that is not linked to your name or to any account, because there is no account.

What a crash report never contains: the names of any compounds you track, your doses, your notes, your observations, your measurements, your injection sites, your dates, or any other text you typed. This is not a promise of intent — it is enforced in our code by a boundary that accepts no user-entered text at all, and pinned by an automated test that fails the build if anyone tries.

Purchases

Vialog+ is sold as an in-app subscription. The purchase is handled entirely by the App Store or Google Play. We never see and never receive your card, your billing address or your payment details. The app is told only whether an active subscription exists.

What Vialog does not do

• No advertising, no ad identifiers, no ad networks.
• No selling or sharing of data with anyone. There is nothing to sell.
• No tracking across other apps or websites.
• No account, so nothing to sign out of and nothing to be breached.
• No health data written to or read from Apple Health or Health Connect.

Permissions Vialog asks for, and why

• Notifications — only to deliver the dose reminders you set, and a warning before a free trial ends. Declining them costs you the reminders and nothing else.
• Access to a file or folder you pick — only at the moment you export a copy, restore from a file, or choose where the backup goes. Vialog does not browse your storage.

Your rights, and how to exercise them here

Because your record lives on your device and nowhere else, you do not need to ask us for it and we could not withhold it:

• Access and portability — Settings → Export a copy gives you the whole record as a plain text file you can open in a spreadsheet.
• Erasure — Settings → Delete everything erases the record from the device immediately, and the app returns to the state of a fresh install. Any backup file you made yourself remains yours to delete, wherever you put it; the app stops writing there.
• Crash reports — if you want a crash report deleted, write to us with the date and device and we will ask Google to remove it.

Children

Vialog is not directed to children and is not intended for anyone under 18.

A necessary word about what Vialog is

Vialog is a calculator and a record. It is not a medical device, it does not diagnose, treat, cure or prevent any condition, and it never advises what to take or how much. Talk to a doctor about your health and before making medical decisions.

Changes to this policy

If the app ever starts collecting something it does not collect today, this page changes on the same day, and the date at the top changes with it.