Privacy policy

What VialMath is

VialMath is a calculator and tracker that runs in your browser or as an installed web app (PWA). It performs arithmetic and schedule logic on the numbers you enter. It does not collect, transmit, or store your protocol data on any server we operate, except as described below for the one-time license check.

The network calls VialMath makes

1. The license check, once, at activation. That check transmits your license key — not your protocol data, not your compounds, doses, schedules, vial history, gate checks, or metric log. We do not log or retain IP addresses from it.

2. The update check, when the app opens or returns to the foreground. VialMath fetches its own version.json from the same address it was loaded from, and compares the build number with its own. If a newer build exists it shows you a banner. The request carries no license key, no identifier, no cookie and no protocol data — it is the app asking what version it should be. It exists because VialMath installs as a PWA, and a stale cached copy is otherwise invisible: you would go on using an old build believing it was current, which for a calculator is the worst failure available.

Disclosed 2 September 2026, on this page's own terms. The section below committed us to disclosing "any future release [that] adds a recurring call of any kind (a re-validation check, an update check…)". The update check had shipped and this page had not caught up. An independent audit of our own claims found it, and this is the correction. We have not removed the check — it protects you from running stale arithmetic — but the earlier wording, "the only network call", was wrong, and any page of ours that still says "only" is wrong until fixed.

What we do not do

• No accounts. There is no sign-up, login, or user profile anywhere in VialMath.
• No sync. Your data is not copied to, or backed up on, any server we operate.
• No analytics or tracking in the app. VialMath does not run analytics scripts, session recording, or third-party trackers of any kind inside the app itself. That is a deliberate line, and it is why the app is missing from the one thing we do count — described immediately below.
• A page counter on our public web pages, and nothing more. Our marketing pages (the home page, the free calculator, the comparison page and similar) record that a page was viewed and which site linked to it. They also record four named actions in the same way and with the same information — that a calculator was used, that a purchase link was clicked, that the app was opened, that a tool was used. Each is counted exactly as a page view is: a name and nothing attached to it. That is the whole record: no cookies, no IP address, no user agent, no device or browser fingerprint, no identifier of any kind, and no third-party analytics service. We cannot tell one visitor from another, cannot follow anyone between pages, and cannot connect a page view or an action to a person, a purchase or an email address — which is why the counts above tell us how many, and can never tell us who. The app is deliberately excluded — nothing inside VialMath is counted. We use this only to learn which pages people reach.
• One counter that stays on your phone. When you reach a feature that is part of Power, VialMath keeps a tally on your own device of how many times that has happened and what you did about it. It records the name of OUR feature — nothing you typed, nothing about your protocol — and it is never transmitted anywhere. It exists so the app can be honest with itself about which limits people actually reach; you can read the whole of it under Data inside the app, and clearing the app's data erases it.
• No selling, sharing, or aggregating your data. Your protocol data never reaches our servers in the first place, so there is nothing there to sell or share. The one thing we can hold — an email address, only if you type it into the optional signup form on our calculator page — is never sold, shared, or passed to anyone selling anything. See "The optional mailing list" below.

The optional mailing list

There is one place on this site where we can receive something about you: an optional signup form on the free calculator page. It is not part of the app, it is never required for anything, and no feature is gated behind it.

If you use it, we store your email address, which page you signed up from, and the date. Nothing else — no IP address, no device information, no cookies, no profile. It is kept on Cloudflare Workers KV.

We do not sell, rent, share, or broker this list, to anyone, for any price — and specifically never to anyone selling anything. This is not a preference we may revise for a good offer; addresses collected under this promise stay under it permanently, and a future change to this page would not release them.

We use it for one thing: telling you when there is a new free tool or an app update. Every message has a one-click unsubscribe and we honour it immediately. Ask us to delete your address at any time — write to [email protected] and it is removed.

Your protocol data has nothing to do with this. It stays on your device, is never linked to your email address, and is never transmitted to us — signing up changes none of that.

Where your data actually lives

Everything you enter — compounds, phases, cycles, vial events, dose logs, gate checks and decisions, blends, metric entries — is stored locally on your device, using your browser's own local storage. It stays there until you delete it, clear your browser's site data, or export it yourself.

You can export a full backup (JSON), a spreadsheet-ready CSV, or a calendar file (.ics) at any time, from the app's Data view. Your data is never locked in.

What we deliberately do not claim

We do not claim VialMath is "fully offline," makes "no network calls," or involves "zero telemetry" — the one-time license check at activation is a real network call, and this page discloses it plainly rather than rounding it away. If that changes — if any future release adds a recurring call of any kind (a re-validation check, an update check, crash reporting) — this policy will be updated in the same release, not after.

The site itself

The marketing site (this page, the calculator, the comparison page) receives standard, non-identifying web server access logs from our hosting provider, as essentially every website does. We also run our own page counter on these pages, described under “What we do not do” above: it records that a page was viewed and which site linked to it, and nothing else. We do not use advertising pixels, third-party trackers, or any third-party analytics service anywhere on this site.

Children's privacy

VialMath is not directed at, and is not intended for use by, children.

Changes to this policy

1 September 2026 — Corrected an inconsistency in this policy. The section “The site itself” said we add no analytics to the site, while the section above it described the first-party page counter we have run on our marketing pages since 29 August 2026. The counter and its limits were disclosed here before it recorded anything; the conflicting sentence has been corrected to match. No data practice changed, and nothing we collect has ever included a cookie, IP address, user agent, fingerprint, or identifier of any kind.

If this policy changes, we will update the date at the top of this page. We will not narrow a privacy commitment retroactively without saying so plainly here.

Contact

Questions about this policy: [email protected].