MRI Guard is designed to be private. There is no user account and no sign-in.
This policy explains exactly what the app does and does not do with data.
Stored on your device
- Your saved auto-start locations are stored only on your device
(and on your Apple Watch, if you use the watch app). The app never uploads your saved
places; they leave the device only inside a link you share yourself (see "Sharing
settings" below).
- Your settings are stored on your device (and on your Apple Watch).
They leave it only as the anonymous, coarse statistics described under "Anonymous
analytics" below (if that is on), or inside a link you share yourself.
- Location. MRI Guard uses your device's location to keep monitoring
running in the background, to auto-start at your saved workplaces if you enable it,
and — when you add a place — to help you find it (see "Address search" below). Your
location is never transmitted to us or stored on any server of ours; for the place
search it is sent to Apple, which handles it.
Anonymous analytics (optional — you can turn it off)
- To understand how the app is used and to fix problems, MRI Guard can send
anonymous, aggregated usage statistics and crash/performance
diagnostics using TelemetryDeck, a privacy-focused analytics service
based in Germany.
- This data contains no name, no email, no account, no location,
and no name of the device; the only identifier is a one-way hashed, per-install ID
that cannot be linked back to you. Examples: how often the app is
opened, how often the alarm triggers (as a coarse range), which settings are in use,
and whether a crash occurred.
- You can turn it off anytime: Settings → Privacy → "Share anonymous usage
data".
- TelemetryDeck processes this data on our behalf. See
telemetrydeck.com/privacy.
Address search
When you search for a place to add as an auto-start location, the text you type —
and the map area you are searching in, which starts around your current position — is sent to Apple's Maps service to return results.
If you tap "Use current location", your position is sent to Apple's Maps service in the
same way, to suggest the name of the place you are at. This is handled by Apple under
Apple's Privacy Policy.
We never receive your searches or your position.
Sharing settings (version 1.3 and later)
In Settings → Share settings you can pass places and settings on to a colleague as a
link or QR code. The link holds only what you choose — places (name, position and
radius), alarm and notification settings — plus the date and, if you type one, a sender name.
All of it is written into the link itself, after the "#".
- The app sends this nowhere, and we never receive it. The link travels like any
message through the app you choose (for example Messages, WhatsApp or email): that
service, and anyone who has the link, can read what is in it.
- If the link is opened in a web browser rather than in MRI Guard, a short page on
papaetfilles.github.io shows what the link contains. It reads the settings in the
browser only. Browsers do not send the part after "#" to the web server — unless a
mail or messaging service has altered the link (some link-protection services and
messaging apps do); then that service, and in some cases the web host, can see what
the link contains. The page is
hosted by GitHub Pages, which — like any web host — receives the usual technical data
whenever the page is loaded (also when a messaging app loads it for a link preview),
such as the IP address; see the
GitHub Privacy Statement.
- Receiving a link changes nothing by itself: MRI Guard shows what would change, and
applies it only when you tap "Apply".
Apple Watch and Health data (version 1.1 and later)
An MRI shift you start on the Apple Watch runs as a HealthKit workout session. During
the shift the watch collects heart rate, active energy and distance through HealthKit;
when you end it, the app reads steps, stand time, time in daylight and the Noise app's
sound levels for the shift window to build the summary. You decide at the end of every
shift whether to save it to Health — as a Walking (indoor) workout that carries the
magnetic-field readings as workout metadata — or to discard it; left unanswered, the
shift is saved after ten minutes.
- Health data is read and written only on the watch and shown on your iPhone. It is
never uploaded, never shared with us or anyone else, and never used for
advertising, analytics or any other purpose.
- The shift summaries kept on your iPhone are stored only on the device and are removed
when you delete the app; workouts you saved stay in Health, where you can delete them.
- You can withdraw HealthKit access at any time in Settings › Health › Data Access &
Devices › MRI Guard. The magnetic-field alarm keeps working without it.
Alarms from the iPhone reach the watch as ordinary notifications.
What we do not do
- We do not sell your data.
- We do not use it for advertising, and there is no third-party advertising SDK.
- We do not track you across other apps or websites.
Data retention & your rights
Because we do not collect personal data, we hold nothing that is tied to you.
On-device data is removed when you delete the app; anonymous analytics cannot be traced
back to you. Under the GDPR you have rights over personal data — since we process none,
there is nothing to access, correct, or erase. For any question, contact us below.
Children
MRI Guard is a professional tool and is not directed at children.
Changes
We may update this policy; the "last updated" date above will change accordingly.
Contact
Dr. David Grodzki · info@papaetfilles.com