JustCall

I couldn’t video call my mom. That’s what started all of this. She’s on Android, I’m on iPhone, and suddenly a simple call turned into a twenty-minute back-and-forth about apps, accounts, and “wait, can you just download this one?” It’s 2026. This shouldn’t be a puzzle.

So I started wondering: what if you could call anyone in the world with just a link? No installs. No accounts. No awkward tech support for your parents before you’ve even said hello.

I built it. It’s called JustCall
www.just-call.app

The idea took ten minutes. The internet took longer.

The concept was simple enough to sketch on a napkin. A browser-based video call, peer-to-peer, zero friction on the receiving end. You send a link. They click it. You’re connected.

Then I opened the WebRTC documentation and reality set in.

International WebRTC is quietly brutal. NATs and firewalls snap peer-to-peer connections without warning. UDP gets throttled or blocked in certain regions. And when calls fail, they fail silently. No error. No explanation. Just nothing. You’re left wondering if it’s your internet, their internet, or some invisible wall sitting somewhere between two countries.

The tutorials make it look clean. The real world is not clean.

To get JustCall working across borders, behind corporate firewalls, on restrictive mobile networks, I had to go well past what most WebRTC guides cover. TURN server fallback for networks that block direct connections, robust handling across regions, a relay architecture that kicks in automatically when the direct path fails. The goal was simple: the call connects, and the person on the other end never has to know how.

The hardest constraint was also the most important one. It had to work for my mom. Not for a developer on a clean home network. For someone who just clicks a link and expects it to work, the same way a phone call works.

Two days later, I called her. Crystal clear. No dropped connection. More stable than FaceTime or WhatsApp on a good day.

Then strangers started using it.

I shared JustCall with friends and family first. They loved it. Then I posted it on LinkedIn. People from around the world started using it. Strangers. That felt incredible.

Then I looked at the data.

I had connected Amplitude to track behavior, and the numbers humbled me fast. Bounce rate: 70%. Three out of four people who landed on JustCall left almost immediately.

I sat with that number for a while.

The hard truth is I understood why. When you land on an app and someone asks you to start a video call with no context, no explanation, no reason to trust it, it’s unsettling. It feels like opening a door you weren’t sure you should open. The product worked. The product just wasn’t communicating that it worked, or even what it was.

I had solved the wrong problem first. I spent two days making the call bulletproof and about ten minutes thinking about what a stranger would feel when they arrived.

Trust is a product feature.

I went back to basics. The design stays simple, that was intentional from the start. But this time I focused on one thing: clarity.

What is this? Why should you trust it? How does it work?

Three questions every new user silently asks before they decide to stay or leave. I hadn’t answered any of them. The app just stared back at them and waited.

Now I have answers built into the product itself. Not a wall of text, not a tutorial, just enough signal to tell someone: this is safe, this is simple, and this is worth one click.

The redesign is live. I’m watching the numbers. My bet is that trust, built into the product rather than bolted on as an afterthought, will show up in the data. We’ll see if I’m right.

After two days I see that the bounce rate is slowly going down:

Building something people actually use turns out to be two separate problems. First you make it work. Then you make people believe it works. I assumed the first one would take care of the second. It doesn’t.

If you’re building something early, I’d love to know: how do you think about trust in your product? It’s the thing nobody talks about in the tutorials, and it might be the thing that matters most.

And if you need a video call, try it yourself at just-call.app.

Feedback is always welcome.