Can you livestream with both cameras at the same time on iPhone?
Short answer: not with an app built the way DualCam is built. Running both cameras at once and turning that into a live broadcast are two separate problems, and solving the first does not get you the second for free. DualCam solves the first: it composites both camera images into one frame in real time and writes that frame straight into a video file on the phone. There is no server anywhere in the product, which is also why nothing you record ever leaves the phone unless you choose to share it.
That is worth spelling out, because the two things sound similar from the outside — both are “video coming off two cameras in real time” — but the pipeline a live broadcast needs is a different question from the one a multi-camera session answers.
What a multi-camera session actually gives you
Running two cameras at once is a hardware capability, not a streaming capability. It requires a multi-camera session, which iOS has supported since the A12-generation chip — the reason DualCam sets iPhone XS, iPhone XR or newer as its floor. What that session hands an app is two live image streams that can be read, composited and written to disk in the same pass. It says nothing about a network connection and does not need one: a phone in airplane mode can still record a dual-camera video from start to finish.
Live streaming asks a different question: can this device keep encoding video and pushing it out over a network fast enough that someone elsewhere sees it a few seconds after it happened. That is a real-time upload problem stacked on top of a real-time capture problem, and it exists whether the source is one camera or two.
Why writing a file and streaming to a server are not the same job
A local recording only has to keep up with itself: composite a frame, encode it, write it to a file that already exists on the same device, at whatever pace the file format needs. A live stream has to do all of that and then hand the encoded output to a network layer that can stall, drop packets, or simply not have enough bandwidth in the moment — and the video has to adapt to that in real time or the viewer sees it stutter and buffer. Building that adaptive network path well is a substantial piece of engineering on its own, separate from anything a multi-camera session does.
That is also why DualCam is built the way it is: there is no server in the product, and footage stays on the phone until you decide to save it to Photos or share it yourself. Adding live streaming would mean adding exactly the part the app is deliberately built without.
The screen-broadcast workaround, and its limits
iOS does have a general way to livestream whatever is on screen: apps like Twitch, YouTube or a platform’s own broadcaster can pick up the phone’s screen through the system broadcast picker and push it to their service. Pointed at a dual-camera preview, that would technically put both camera images on a live stream, because from the system’s point of view it is just screen content.
The trade-off is the same one that applies to using a screen recorder as a substitute for a real dual-camera recording app: the status bar, on-screen controls and any notification banner get baked into the stream along with the two camera images, and the encoder on the other end is tuned for screen sharing, not camera footage. It works as a last resort. It is not what a dedicated dual-camera app would produce if the network side existed.
If going live is the actual goal
A recorded take you post afterwards and a live broadcast serve different audiences, and it is worth being honest about which one you actually need before reaching for a workaround. Reaction videos, interviews and vlogs — the shots dual-camera recording is built for — mostly do not need to be live; the value is in both angles being captured together and instantly postable, not in real-time delivery. If a broadcast genuinely has to be live, that points toward a purpose-built streaming app or platform feature rather than a recorder, dual-camera or otherwise.
Common follow-up questions
Does DualCam upload or stream my video anywhere?
No. There is no server in the product. Recording writes straight to a file in the app’s own library on the phone, and nothing leaves the device unless you save it to Photos or share it yourself.
Is live streaming a hardware limitation, like dual-camera support is?
No. Whether this iPhone can run two cameras at once is a hardware question, separate from whether an app chooses to stream that output anywhere. A device that supports dual-camera capture is not thereby blocked from streaming; the missing piece is the app implementing a network broadcast path at all.
Can I use a screen broadcast to go live with a dual-camera preview?
Technically yes, since a screen broadcast captures whatever is on screen. It also captures the status bar, on-screen buttons and any notifications, and the encoder is built for screen content rather than camera footage, so treat it as a last resort rather than a real substitute.
Want to just do this?
DualCam records the iPhone front and back cameras at the same time and writes one finished MP4 while you shoot. Free, no account, no ads, nothing leaves the phone.