Privacy policy
-Last updated 5 November 2026
- -- mac4DSTEM and macTEM collect no personal data. Both applications perform all analysis on - your own machine, have no user accounts, and send nothing to me. macTEM makes no network - connection at all; mac4DSTEM's one network request is a Materials Project fetch that you - start yourself. -
- -Both applications
- -- mac4DSTEM and macTEM are local desktop applications. Neither contains analytics, telemetry, - advertising, crash reporting, or any other component that transmits information about you - or your work. -
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- Your datasets and results stay on your Mac. Datasets you open, the results you compute, and the parameters you choose are read from and written to your own storage only. -
- No accounts. There is no sign-in, no licence server, and no activation. -
- No tracking identifiers. Neither application generates or stores a device or user identifier. -
- Both applications run inside the macOS App Sandbox. They receive access to a file only when - you select it in a system Open or Save panel. Where one needs to reopen a file you chose - earlier — for example to update the session file saved next to your data — macOS stores a - security-scoped bookmark for that specific file on your machine. Those bookmarks stay local - and can be removed by deleting the application's container. -
- -mac4DSTEM
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- One network request, started by you. “Materials Project…” in the phase picker sends an HTTPS request to api.materialsproject.org carrying your own Materials Project API key and the material ID you typed. The key is kept in the macOS Keychain. The application makes no other connection. -
macTEM
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- No network access. macTEM is not granted network access by the App Sandbox and makes no connection of any kind. -
This website
- -- The site is a static page. It sets no cookies, runs no analytics, and - embeds no third-party fonts, scripts, or trackers. Nothing you do here is profiled or - recorded by me. -
- -- The site is hosted on GitHub Pages, with DNS provided by - Cloudflare. As a technical necessity of delivering any web page, the - hosting provider processes your IP address and request metadata in server logs for - security and operation. I have no access to those logs and cannot connect them to you. - See the - GitHub Privacy Statement - and the - Cloudflare Privacy Policy. -
- -- The legal basis for this processing is Art. 6(1)(f) GDPR — the legitimate interest in - presenting a functioning, secure website. -
- -If you email me
- -- Writing to mail@mac4dstem.com means - your address and the content of your message are processed so that I can reply. The legal - basis is Art. 6(1)(b) GDPR where your message concerns the application, and otherwise - Art. 6(1)(f) GDPR. -
- -- Correspondence is kept only as long as needed to deal with the matter and to meet any - retention obligation that applies, then deleted. Your address is not added to any mailing - list and is not passed to third parties. -
- -Your rights
- -- Under the GDPR you have the right to access your personal data, to have it corrected or - erased, to have its processing restricted, to object to processing, and to receive it in a - portable form. To exercise any of these, write to the address below. -
+Privacy
- You also have the right to lodge a complaint with a data protection supervisory authority, - in particular in the member state of your residence, workplace, or the place of the - alleged infringement. + mac4DSTEM and macTEM collect no data. Everything runs on your Mac. There are no accounts, + no analytics, and nothing is sent to me. The one exception is the Materials Project lookup + in mac4DSTEM, which you start yourself and which sends your own API key and the material ID + to materialsproject.org.
-Changes
-- If this policy changes, the revised version is published here with a new date at the top. - Material changes affecting an application will accompany a release of it. + This website sets no cookies and runs no analytics. It is hosted on GitHub Pages, which + keeps the usual server logs + (GitHub privacy statement). + If you e-mail me, I keep your message only to reply. Under the GDPR you can ask me to + access, correct or delete your data at any time.
-Controller
-Adolf-Reichwein-Straße 28
57076 Siegen
Germany
- mail@mac4dstem.com + mail@mac4dstem.com
- Full provider identification is on the Impressum page. -
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