Spantop: Display Extender

Turn any device into a monitor

Only for Mac

Free · In‑App Purchases

Mac

Works in pairs: install Spantop on this Mac and the free companion app on a spare tablet or second Mac. Connect with USB or Wi-Fi - you get a real extra display. Spantop turns a spare Mac or tablet into a real second monitor for your Mac. WHAT YOU NEED - SPANTOP WORKS IN PAIRS 1. Your main Mac, running this app (the sender) 2. A second device to become the extra screen — another Mac or a tablet — running Spantop too Without a second device there is nothing to extend to. Setup takes you straight there: a tablet scans a QR code to get the free companion app, and another Mac uses this same app (one purchase covers your Macs signed into the same Apple ID). Your Mac treats the second device like a physical monitor — drag windows onto it, use Spaces and Stage Manager, run fullscreen apps, exactly as on a normal external display. SET UP IN MINUTES 1. Install Spantop on the second device (the in-app QR code takes your tablet straight to it) 2. Connect a USB-C data cable, or put both devices on the same Wi-Fi 3. Click the Spantop icon in the menu bar — nearby devices appear automatically. Pick yours, accept on the other screen, and you're extended. FEATURES • A real macOS display, not a remote-desktop window — Spaces, fullscreen apps and window snapping all behave normally • Wired USB-C/Thunderbolt: lowest latency, full Retina HiDPI sharpness • Wireless: zero-configuration discovery over Wi-Fi, with H.265 hardware encoding • Two Macs connect directly over peer-to-peer Wi-Fi — no shared network or router needed • Multiple receivers at once — each appears as its own independent display • Automatic failover: unplug the cable mid-session and the stream hops to Wi-Fi WIRED CONNECTION - RECOMMENDED • Lowest latency at full Retina resolution • Use a DATA cable, not a charge-only cable — charge-only cables carry power but no picture GOOD TO KNOW • The second device is a display, not a controller: you keep working with your main Mac's keyboard and trackpad; input on the receiver is not sent back • Try everything free for 7 days — one-time purchase, no subscription PRIVACY Screen Recording permission is required to capture the virtual display. No screen data is saved or sent to any server, ever — frames travel directly from your Mac to your receiver over the cable or your local network.

  • This app hasn’t received enough ratings or reviews to display an overview.

Streaming now works on many more devices - Spantop automatically picks a video mode your second screen supports. Clearer first-time setup, easier-to-read text, direct Mac-to-Mac wireless, and more reliable purchase restore.

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 Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Identifiers
    • Usage Data
    • Diagnostics

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