Working from your Tesla but stuck on one laptop screen? SideDisplay turns your Tesla's touchscreen into a wireless extended monitor — not mirroring, a true second display. Drag windows across, run Slack on one screen and your IDE on the other. It runs over WebRTC through the built-in browser — zero hardware needed. Just USB tether your phone for internet and you're set. Mac and Windows. And it's not just Tesla — any device with a browser and Wi-Fi works too. Up to 3 displays. Try it free.
Hey Product Hunt! 👋 I'm S.Lee, the solo developer behind SideDisplay.
I built this because I kept wishing for a second monitor while working from my Tesla. I wanted a real extended display where I could drag windows across and actually multitask.
SideDisplay uses WebRTC to turn your Tesla's touchscreen into a true wireless extended monitor for your Mac or Windows PC. No dongles, no cables, no hardware mods. It runs right through the built-in browser.
And here's the thing — it's not limited to Tesla. Any device with a browser and Wi-Fi works: tablets, smart TVs, even other cars. Tesla is just the flagship use case.
A few highlights: 🖥️ True extended display, not mirroring — drag windows across screens 📡 Wireless via WebRTC, ~100ms latency 🔗 Connect up to 3 screens simultaneously 💻 Mac (Apple Silicon, macOS 15+) and Windows 11 🆓 Free trial: 60 min/week, no credit card needed
I daily-drive this myself — my Tesla's touchscreen is always my second monitor. It's the setup I always wanted.
Would love to hear your thoughts — especially if you've tried working from a car or wished you had a portable second screen on the go. What use cases would you try first?
As a remote software engineer who works from the car fairly often — laptop on a wheel holder, phone hotspot, parked by the ocean or a forest trail — I actually thought about building something like this myself. My first blocker was exactly what the founder hit too: both my Mac and the Tesla connect to the same local network, but Tesla's browser blocks access to private IP addresses. That killed my initial approach, and I shelved it.
Found SideDisplay before launch and it's been reliably solid. The private IP problem is solved by reconfiguring macOS Internet Sharing to assign public IPs instead — genuinely clever. The touch control is a nice detail too — tap, scroll, drag all work — though practically speaking I mostly just use it as an extended screen and leave it there.
A couple of friction points, and one feature request:
The repeated osascript permission prompts on Mac when starting/stopping screen sharing get old fast. I get that it's an OS security constraint, but it disrupts the flow.
Mac Internet Sharing as a prerequisite can occasionally be finicky. Usually it just works, but I've twice hit the same two issues: the car couldn't find the shared network before connecting, and once connected, iPhone lost internet access while the hotspot itself stayed live. Edge cases, but worth knowing about.
The font on the car screen is quite small and hard to read comfortably — sitting in the driver's seat puts real distance between you and the display, more than a typical desk setup. Would it be possible to add a default screen zoom option in a future release?
The first two are really platform-level friction, not the product's fault. The scaling one feels like something worth prioritizing. Overall, this is exactly the product for anyone working from their car — well executed, and the backstory behind it is genuinely worth reading. Solid launch.
This is brilliant, @sj_lee15 ! Turning a Tesla (or any browser enabled device) into a true extended monitor is such a clever productivity hack. I love that it’s wireless, low-latency, and works beyond Tesla. As a video creator using AI, I can immediately see the potential for streamlined mobile editing setups or multi-app workflows, especially for on-the-go content creation. Really excited to see how people push the limits with this!
S.Lee
Hey Product Hunt! 👋 I'm S.Lee, the solo developer behind SideDisplay.
I built this because I kept wishing for a second monitor while working from my Tesla. I wanted a real extended display where I could drag windows across and actually multitask.
SideDisplay uses WebRTC to turn your Tesla's touchscreen into a true wireless extended monitor for your Mac or Windows PC. No dongles, no cables, no hardware mods. It runs right through the built-in browser.
And here's the thing — it's not limited to Tesla. Any device with a browser and Wi-Fi works: tablets, smart TVs, even other cars. Tesla is just the flagship use case.
A few highlights:
🖥️ True extended display, not mirroring — drag windows across screens
📡 Wireless via WebRTC, ~100ms latency
🔗 Connect up to 3 screens simultaneously
💻 Mac (Apple Silicon, macOS 15+) and Windows 11
🆓 Free trial: 60 min/week, no credit card needed
I daily-drive this myself — my Tesla's touchscreen is always my second monitor. It's the setup I always wanted.
Would love to hear your thoughts — especially if you've tried working from a car or wished you had a portable second screen on the go. What use cases would you try first?