It's iPhone Duo launch day! While many questions have been raised over the device's availability, it has also become clear that many of your favorite apps might not be optimized for the new layout at launch.
For apps to scale seamlessly across the iPhone Duo, they need to be built on the iOS 27.1 software development kit (SDK). This SDK provides the tools required for apps to stretch effectively across the Duo's new 1:4.1 aspect ratio inner screen.
Without using the updated SDK, apps render with varying sizes of black bars across the unused display area, depending on which legacy SDK version they were built on.
For top-tier VPNs, a lack of display compatibility can be frustrating even if it doesn't impact their functionality. We reached out to major providers to find out if your favorite VPNs are compatible on day one.
We will update this guide over the coming week as providers release patch updates. If you've picked up an iPhone Duo and tested a service not listed here, let us know in the comments below.
Which VPNs are compatible?
Which VPNs are fully compatible with the iPhone Duo?
These VPNs offer the best iPhone Duo experience right now. They are fully compatible with both the inner and outer displays, using the full screen area without letterboxing or black sidebars.
Partially compatible VPNs
Which VPNs aren't compatible?
Which VPNs aren't compatible with the iPhone Duo right now?
These VPNs currently run an SDK older than 27.0, meaning you'll see large black spaces when using the service on both the inner and outer display. This doesn't necessarily impact the performance of the VPN itself, but could become extremely annoying nonetheless.
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