Privacy Policy

Last updated: October 12, 2026

DualMac (the iPad app) and DualMac Companion (the Mac app) are published by Marius Labs. This policy describes what data the apps handle and where it goes. The short version: Marius Labs operates no DualMac account or content backend and does not receive your screen, files, credentials or clipboard. Optional Apple sync remains governed by Apple.

1. No account, no backend, no tracking

• DualMac requires no account and has no cloud backend operated by Marius Labs.
• The apps contain no advertising and do not track you across apps or websites. The iOS app uses the RevenueCat SDK to count installs and active devices, with a random anonymous identifier that is not linked to you.
• The iOS app also sends anonymous usage statistics to Amplitude (Amplitude, Inc., servers in the United States) so we can see which features work and where setup fails: how a Mac is reached (Wi‑Fi, Tailscale, custom address, SSH tunnel), whether a connection succeeds or why it fails and which sign-in method the Mac asks for (VNC password or Mac account), session lengths, the number of Macs in your library, and whether the Companion or the setup guide are used. When the setup guide opens, the app also reports how many Macs it can see nearby and whether Local Network access and Tailscale are on for this device. These events carry a random device identifier, the app version, device model, OS version, language and region setting. They never include your Macs' names or addresses, screen content, files, clipboard or credentials; the app does not attach your IP address or location to them, and no session recording is made.
• When the iOS app crashes, it sends an anonymous crash report to Firebase Crashlytics (Google LLC) so we can fix the bug: the stack trace, app version, device model, OS version, free memory and disk space, and a random installation identifier. Crash reports never include your Macs' names or addresses, screen content, files, clipboard or credentials, are not linked to you and are kept for 90 days. Google Analytics is not used.
• We have no access to your Macs, your files, your screen content or your credentials.

2. What stays on your devices

• Machine list and settings are stored locally on your iPad. If you explicitly enable a sync option, the disclosed connection metadata or credentials can also be stored through your Apple iCloud or iCloud Keychain account.
• Credentials (VNC passwords, pairing secrets) are stored in the device Keychain.
• Screen streams, files and clipboard content travel directly between your iPad and your Mac, over your local network or your own private network (for example a Tailscale tailnet). They are never routed through Marius Labs.

3. Network connections the apps make

• DualMac (iPad) connects to the Macs you add, to RevenueCat and Amplitude for the anonymous statistics, and to Firebase Crashlytics for the anonymous crash reports, described in section 1, and, only for sync options you enable, to Apple iCloud services.
• DualMac Companion (Mac) accepts connections only from paired iPads on your Tailscale tailnet, and periodically checks dualmac.app for signed software updates (Sparkle). The update check transmits ordinary network metadata such as IP address and user agent to the hosting provider.

4. Data deletion

Marius Labs has no account or content record to delete. Before uninstalling, remove each Mac from the DualMac library to delete its app-managed local credentials, and disable any iCloud sync options you enabled. Then delete DualMac from the iPad and move DualMac Companion to the Trash on the Mac. Apple Keychain or iCloud data can outlive an app uninstall, so uninstalling alone is not presented as a guaranteed Keychain deletion.

5. Children

DualMac is a developer utility, not directed at children.

6. Changes

If this policy changes, the new version will be published at dualmac.app/privacy with an updated date.

7. Contact

Marius Labs — [email protected]