**Privacy Policy | Dosyne**

> How the Dosyne peptide calculator app and dosyne.com handle data: why there is no account and no server, what stays on your device, and what we never collect.

Source: https://dosyne.com/privacy/ · updated: 2026-07-31

[Home](https://dosyne.com/)/Privacy

# Privacy policy

This covers the Dosyne mobile app and the website at dosyne.com. It is short for an
unusual reason: the app has no account, no server and no analytics, so there is very
little to describe.

Last updated 31 July 2026

## Who we are

Dosyne is published by Vast Flow, LLP, which operates the app and this website and is
the data controller for the limited processing described here. Write to
[support@dosyne.com](mailto:support@dosyne.com) with any question about this
policy, including a request to access or delete data.

## The short version

Dosyne has no user accounts, no sign-in and no cloud sync. It never asks for your name,
your email address or your date of birth, and there is nowhere for it to send them. All
of your data — logged doses, vials, injection sites, weights, settings — lives in the
app's own storage on your device. Every calculation happens locally. Deleting the app
deletes the data with it.

This is why the App Store privacy label reads Data Not Collected. That is not a
formality we squeezed through; it is a genuine description of the architecture.

## Why we built it this way

A record of what someone injected, when, and where on their body is about as sensitive
as health data gets. It could be subpoenaed, breached, sold in an acquisition, or
simply mishandled. The most reliable protection against all of those is not to hold it,
so the app has no server that could be compromised and no database that could be
breached. The cost is real: there is no cloud backup and no sync between your phone and
your tablet. We think that trade is the right one for this category, and we would
rather state the cost than pretend it does not exist.

## What the app stores on your device

Logged doses with the compound name, amount and concentration at the time; vials and
their remaining volume; injection-site history; weight entries; cycle plans; reminder
settings; and non-sensitive preference flags. None of it is transmitted. It may be
included in your own device backup if you have that enabled, in which case it is
governed by Apple's or Google's terms rather than ours.

## Apple Health

With your permission, the app reads body mass from Apple Health for the progress chart
and mirrors weights you enter manually back into Health. That exchange is local to the
device and governed by Apple's HealthKit rules, which prohibit using health data for
advertising. We never receive it. You can refuse the permission and the app works
normally without it, minus the chart. Note that iOS deliberately hides read-permission
status from apps, so what we show you is our own intent rather than a confirmed
connection.

## Notifications

Reminders are scheduled locally by your device. There is no push server, no token, and
nothing leaves the phone to make a reminder fire. Reminder text never contains an
amount or a compound name, so a notification on a lock screen does not disclose
anything to somebody glancing at it.

## Purchases

Subscriptions are sold and processed by Apple and Google. We never see your payment
details. To decide whether to unlock Pro features, the app uses RevenueCat, which
processes an anonymous identifier and the receipt the store issues. That tells us a
subscription exists and what state it is in. It does not identify you, and we cannot
connect a subscription to a person or to any logged data.

## Analytics: none in the app

The app contains no analytics SDK. No Firebase Analytics, no Crashlytics, no
attribution SDK, no event tracking, no advertising identifier. We do not know which
screens you open, which compounds you log, or how often you use it. This costs us
product insight and we accept that.

This website is different and you should know it. It loads Microsoft Clarity, which
records aggregate site usage — pages viewed, approximate region, device and browser,
and anonymised interaction patterns such as scroll depth — so we can find pages that
are broken or confusing. It is not connected to any app data and it does not follow you
to other sites. It sets cookies and honours the Global Privacy Control signal where
your browser sends one. A content blocker will stop it and every calculator on this
site works normally without it.

## The calculators on this site

Everything you type into a calculator here stays in your browser. Vial strengths,
diluent volumes and amounts are never transmitted to us, because the arithmetic runs on
your machine in JavaScript. Closing the tab discards it. There is no form submission
anywhere on this website.

## What we never collect

We do not collect your name, email address, contacts, photos, precise location,
advertising identifier, or any health data. We do not sell data, we do not share it
with data brokers, and there is no advertising in the app. There is no mechanism by
which we could build a profile of an individual user, because there is no identity to
attach one to.

## Legal bases, for readers in the EEA and UK

Because the app processes personal data on the device rather than transmitting it to
us, most of it never becomes processing we perform. Purchase-receipt validation is
necessary to perform the contract you entered into when subscribing. Website analytics
rest on our legitimate interest in improving a free resource, balanced against the fact
that they do not identify you.

## Retention

App data is retained on your device until you delete it or delete the app. We hold no
copy and cannot retrieve or restore it — if you delete the app without a device backup,
that history is gone, and we mention it here because people are sometimes surprised.
Purchase records are retained for as long as store receipt validation requires. Website
analytics follow Microsoft Clarity's own retention schedule.

## Your rights

You may have the right to access, correct, delete or port your personal data, and to
object to certain processing. In practice these are satisfied by the app itself:
deleting an entry deletes it, and deleting the app deletes everything. If you want
written confirmation of what we hold — which for an app user is a purchase receipt
state and nothing more — write to
[support@dosyne.com](mailto:support@dosyne.com) and we will respond within
thirty days.

## Children

Dosyne is not directed at children and we do not knowingly collect data from anyone
under 13. Given the subject matter, the app is intended for adults.

## Security

The strongest security property of this app is architectural: there is no account to
compromise, no password to steal, no server to breach and no central database of user
records to leak. Data on your device is protected by the operating system's own
storage protections and by your device passcode. Website traffic is served over an
encrypted connection.

## International transfers

We hold no user data to transfer. Apple, Google, RevenueCat and Microsoft process data
in the regions described in their own policies, which may include the United States,
under the transfer mechanisms those providers publish.

## Changes

If the way data is handled changes, this page changes and the date at the top changes
with it. Material changes will also be announced in the app. If we ever added a server
component, we would say so prominently rather than quietly amending a clause here.

## Cookies and similar technologies

The app uses no cookies; it is not a browser. On this website the only cookies set are
those used by Microsoft Clarity for the aggregate analytics described above. There is
no advertising cookie, no remarketing pixel, no social login and no embedded
third-party widget that could set one. The calculators store nothing in your browser
beyond what the page needs while it is open, so closing the tab discards everything you
entered.

We honour the Global Privacy Control signal where your browser sends one, and a content
blocker or your browser's built-in tracking protection will prevent the analytics
script loading at all. Every calculator on this site works normally without it.

## If you are in California

We do not sell personal information and we do not share it for cross-context
behavioural advertising as those terms are defined in the California Consumer Privacy
Act. There is no advertising in the app at all. You have the right to know what we
hold, to request deletion, and not to be discriminated against for exercising either —
and because there is no account, exercising them usually requires nothing more than
deleting the app.

## A note on sensitive categories

A record of injections is sensitive personal data under several privacy regimes, and
in some jurisdictions it attracts specific protections. The design answer we chose is
the strongest one available: we do not receive it. Because the data never leaves your
device, we hold no special category data about any user, we cannot be compelled to
produce it, and no breach of our systems could expose it. If that ever changed we would
say so prominently rather than amending a clause on this page.

## Contact

Questions, deletion requests and complaints go to
[support@dosyne.com](mailto:support@dosyne.com). If you are in the EEA or the
UK and are not satisfied with our response, you may complain to your national data
protection authority.

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HTML version: https://dosyne.com/privacy/
Structured data for this site: https://dosyne.com/api/v1/openapi.json · https://dosyne.com/llms.txt
Dosyne publishes arithmetic, not protocols: nothing here is a dose recommendation,
and dosing decisions belong to a licensed prescriber.
Free to quote and reuse with a link back to the source URL above (CC BY 4.0).