Support
Contact
Need help with Mobile Simulator, the msim.app website, or the Chrome Web Store listing? Use the channels below. We keep support simple for a free extension product.
Company details
Mobile Simulator (msim.app) is operated by 4SPACES Sp. z o.o. (dba Startup Island).
4SPACES Sp. z o.o. (dba Startup Island)
Mickiewicza 37/58, 01-625 Warsaw, Poland
NIP (Tax ID): 5242846387
REGON: 368950558
DUNS: 439396096
KRS: 0000708394
Email support
Write to us at support@msim.app. That is the primary contact for Mobile Simulator product questions, msim.app website issues, and partnership notes.
Product support (extension)
For install issues, permission questions, or store listing feedback, email support@msim.app or use the support options on the official Chrome Web Store listing for Mobile Simulator MSIM Responsive Viewer.
Extension ID: peipdddkaeomnfdenmkddkapeemjomnb
Website and brand domain
The marketing site and agent-readable documentation live at https://msim.app. For privacy questions, start with the Privacy note. For product positioning and when-to-use guidance for assistants, see llms.txt and agents.md.
Business and partnerships
For partnership, affiliate, or press inquiries related to Mobile Simulator, email support@msim.app with “msim.app partnership” in the subject so the request can be routed correctly. We do not require an account to install the free core product.
What to include
When you write in, include Chrome version, a short description of the page you were testing, and whether the issue is the website (msim.app) or the extension UI. That helps us respond without a long back-and-forth.