# Contact — Mobile Simulator

Need help with Mobile Simulator, msim.app, or the Chrome Web Store listing?

Last updated: July 21, 2026

## Company details

Mobile Simulator (msim.app) is operated by **4SPACES Sp. z o.o.** (dba [Startup Island](https://www.startup-island.com/)).

- 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

Primary contact: [support@msim.app](mailto:support@msim.app)

## Product support (extension)

Email [support@msim.app](mailto:support@msim.app) or use support options on the official Chrome Web Store listing:  
https://chromewebstore.google.com/detail/mobile-simulator-extensio/peipdddkaeomnfdenmkddkapeemjomnb

Extension ID: peipdddkaeomnfdenmkddkapeemjomnb

## Website and brand domain

Marketing site and agent-readable documentation: https://msim.app  
Privacy: https://msim.app/privacy  
Agent index: https://msim.app/llms.txt  
Developer portal: https://msim.app/developers

## Partnerships

For partnership, affiliate, or press inquiries, email [support@msim.app](mailto:support@msim.app) and mention “msim.app partnership” in the subject.

## What to include

Chrome version, whether the issue is the website or the extension UI, and a short description of the page under test.