Spantop: Display Extender

Turn any device into a monitor

Only for Mac

Free · In‑App Purchases

Mac

Turn a spare Laptop into a wireless extended display — full HiDPI Retina at near-zero latency over Wi-Fi or a Thunderbolt / USB-C cable(recommended) Spantop creates a virtual monitor that your main device treats like a real physical display. Your other laptop or tablet becomes an extended desktop — drag windows, use Spaces, and run fullscreen apps just like you would on a normal monitor. FEATURES • Extend your display to another laptop or tablet as a real second monitor • Connect over Wi-Fi or a wired USB-C/Thunderbolt cable • Sharp, low-latency picture over a wired connection • Full Retina HiDPI support • Multiple receivers supported simultaneously — each appears as an independent display • Automatic failover between wired and wireless connections HOW IT WORKS Open Spantop on your main device in Sender mode Open Spantop on the other laptop or tablet and switch it to Receive mode Connect both devices with a USB-C data cable, or place them on the same Wi-Fi network On your main device, tap Scan for Devices and select the receiver Tap Connect — the other device Accepts your request and becomes your extended display WIRED CONNECTION — RECOMMENDED • A wired USB-C/Thunderbolt link gives the lowest latency at full Retina resolution • Use a data cable, not a charge-only cable. Charge-only cables carry power but no data, so the connection will not work • If the cable is unplugged, Spantop automatically fails over to Wi-Fi WIRELESS CONNECTION • Works over any shared Wi-Fi network • Uses H.265 hardware encoding for smooth streaming • Zero configuration — devices discover each other automatically IMPORTANT NOTE Spantop is a passive second-display app. The receiver device displays your main device's extended desktop. You control windows using your main device's keyboard and trackpad. Input from the receiver device is not forwarded back to the sender. PRIVACY Screen Recording permission is required to capture the virtual display. No screen data is saved, transmitted to any server, or shared with third parties. Frames are sent directly to the paired receiver device on your local network.

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Much easier setup and more reliable connections: • Spantop now restarts itself after you grant Screen Recording — no more manual quit-and-reopen. Fixed a rare issue where the app could quit and not come back during this step. • Clearer setup guidance, with a button that opens the right pane in System Settings. • Receive mode: your Mac is discoverable automatically — no toggle to find. • The device list now explains what to check when nothing is found. • Fixed an issue where a network hiccup could leave a receiver permanently hidden.

The developer, Aditya Dewaskar, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    • Aditya Dewaskar
    Size
    • 2.4 MB
    Category
    • Utilities
    Compatibility
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Spantop