You describe the app you want. Claude builds it. You open it and the main button is the wrong color, or a section is missing, or the screen is blank. So you go back, explain what's wrong, and wait for another version. Maybe twice. Maybe more.
That back-and-forth happened for one reason: Claude couldn't see what it made. It wrote the app and hoped for the best. You were the only one who could tell whether it worked.
Not anymore. Starting today, Claude can look at the app it built, as it would appear on a phone, and catch its own mistakes before it reaches you.
What changed
After Claude builds or edits your app, it takes a snapshot on a phone-sized screen and looks at it the way you would. It sees the cramped spacing, the button that didn't show up, the section in the wrong place, the screen that came back empty. It also gets a list of anything that broke behind the scenes.
If something's off, Claude fixes it and checks again. It keeps going until the app looks right. You see the result once it's ready.
What this means for you
Fewer rounds of "that's not quite right." The version Claude hands you has been through its own quality check, so it's more likely to look the way you pictured it on the first try. That's true for anything you build with Envelope: a booking page for your business, a fan app for your audience, a weekend project.
It matters most for our upcoming templates. We're building ready-to-go designs for restaurants, fitness, real estate, online shops, events, and education, so you can start from something that looks good instead of a blank screen. Claude can build and refine those templates by checking its own work, which means more of them, faster, with fewer rough edges.
What's coming next
Right now Claude takes a still snapshot of your app. Soon it will capture a short clip you can share on social media or drop into a pitch. Same idea, in motion.
For now: next time you ask Claude to build something in Envelope, it's checking its own work after every change, so what you get back is closer to done.
New to building with Claude? Connect Envelope to Claude walks you through setup in Claude Desktop, Claude Code, or any MCP client.