Privacy Policy

Last updated: November 11, 2026

RoomXDynamics is a room climate simulation for iPhone, currently in development. This page explains what happens with your data on this website and on the waitlist.

This policy covers two things: the RoomXDynamics app, and this website (roomxdynamics.com) including the waitlist by email. They are handled separately below.

The app

The app is not yet available. Before it is released, this section will describe what the app does and does not collect, and the App Store privacy information will match it.

This website

This website has no cookies, no analytics, no tracking pixels and no embedded content from third parties. The site uses your device's built-in fonts; nothing is loaded from a third-party font service. There is no form that sends data to a server. A small script on the waitlist page only assembles the text of the pre-filled email; it stores nothing and sends nothing.

The site is hosted on GitHub Pages, a service provided by GitHub B.V., Prins Bernhardplein 200, 1097 JB Amsterdam, Netherlands, and GitHub, Inc., 88 Colin P. Kelly Jr. St., San Francisco, CA 94107, USA. When you visit, the host's servers automatically process technical data your browser sends, such as your IP address, the date and time of the request, the page requested and your browser type, in server log files. This is necessary to deliver the site and keep it secure. The legal basis is Art. 6(1)(f) GDPR; our legitimate interest is the secure and reliable operation of the website.

GitHub may process this data in the United States. GitHub is certified under the EU–US Data Privacy Framework, which the European Commission recognises as providing an adequate level of protection (Art. 45 GDPR). How long GitHub keeps these logs is governed by GitHub's Privacy Statement; we have no access to them.

If you email us, we use your message and address only to answer you, and delete the correspondence when it is no longer needed for that purpose, unless statutory retention periods apply. The legal basis is Art. 6(1)(b) or (f) GDPR.

The waitlist (by email)

The waitlist runs without a form service. Clicking a price opens your own email app with a pre-filled message to support@roomxdynamics.com. We receive data only when you send it.

• What data: your email address (and a sender name, if your email app includes one), the price estimate in the subject line, the optional audience you selected, the source (taken from the link you came from, for example "network") and anything else you write in the email.
• Purpose: a single notification when RoomXDynamics is available or the project is discontinued, and an aggregated evaluation of the price estimates (totals by price, audience and source, without names or addresses). No newsletter, no advertising. An invitation to a beta test is sent only if we decide to run an open beta, and only after we have asked for your separate permission.
• Legal basis: your consent (Art. 6(1)(a) GDPR), which you give by sending the email after reading the notice on the waitlist page. You can withdraw it at any time with effect for the future, informally by email to support@roomxdynamics.com or legal@roomxdynamics.com.
• Recipients: The emails are stored in a mailbox at iCloud Mail, a service of Apple. For customers in the EU, Apple's contracting party is Apple Distribution International Ltd., Hollyhill Industrial Estate, Hollyhill, Cork, Ireland. Apple may also process data in the United States. According to Apple, transfers of personal data from the EU are governed by Standard Contractual Clauses (Art. 46(2)(c) GDPR). Apple's handling of iCloud data is governed by Apple's Privacy Policy. We do not pass the data on to anyone and do not copy addresses into other systems.
• Retention: until the launch notification; after that we delete the emails and addresses within 30 days. If the project is discontinued, we send a short closing email and then delete within 30 days. In any case we delete no later than 12 months after receipt. If you withdraw your consent, we delete immediately.

Your rights under the GDPR

For the data described under "This website" and "The waitlist", and for emails you send us, you have the right of access, rectification, erasure, restriction of processing, data portability and objection (Art. 15–21 GDPR), and the right to withdraw your consent at any time (Art. 7(3) GDPR). To use them, write to the contact address below.

You also have the right to lodge a complaint with a data protection supervisory authority, in particular in the EU member state where you live. The authority responsible for us is the State Commissioner for Data Protection and Freedom of Information of North Rhine-Westphalia (LDI NRW), Düsseldorf, Germany. If you live in the United Kingdom, you can also complain to the Information Commissioner's Office (ICO).

Changes to this policy

If the way we handle data changes, for example through a form service for the waitlist or the release of the app, this policy will be updated beforehand. The date at the top of this page always shows the current version.

Controller

The controller within the meaning of Art. 4(7) GDPR is:

Dr.-Ing. Jürgen Grönner
Randebrockstr. 7a
46236 Bottrop
Germany

Email: legal@roomxdynamics.com

We answer in English and German.