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Replit Just Changed Everything — Agent 4 Is Here

Julia McCoy5:17

Transcription

What if you could have a team of AI developers all building your app at the same time while you just focus on the vision? That's not a fantasy anymore. Replet just dropped Agent 4 and I got early access. This is their fourth major iteration in under two years. And this one is specifically built around creativity. Here's what's actually different and why this one matters.

Here's what building with AI agents has felt like until now. You type a prompt, you wait, it finishes, you type another prompt, you wait again. It's like having a contractor who can only work on one room at a time, and you have to babysit them or they stop. That's not how real teams build things. And Replet finally fixed it.

Feature one, design canvas. The biggest thing builders waste time on going back and forth between design and code. With Agent 4, there's now an infinite canvas built directly into the same environment as your code. You can sketch out UI ideas, generate variants, compare them side by side, and when something clicks, it goes straight into your production code. No export, no handoff. Done. One thing to know, the canvas only works in the main version of your project, not inside threads. So, make sure you're in the right place before you start designing.

Feature two, projects. Everything in one place. This one is huge for creators and entrepreneurs. Before, if you wanted to build a web app, a mobile app, and a slide deck for pitching it, those lived in completely different tools. Now, one project, one context, one agent that knows everything about what you're building. You can spin up a web app, data apps, presentations, all connected, all sharing the same design guidelines.

Feature three, teamwork mode with plan approval. This is where it starts to feel like you actually have a team. Instead of one massive prompt that tries to do everything, agent 4 breaks your request into discrete tasks that run in the background. But here's the key part. Before it builds anything, it shows you the plan and you approve it. You're not just hoping it does the right thing. You see it, you sign off, then it executes. You can queue up more work, discuss priorities, change direction while the agent is already building in the background. No more waiting for one thing to finish before starting the next. You're the creative director. The agent is the team.

Feature four, parallel agents/multitasking. This is the one that genuinely surprised me. multiple agents working simultaneously on different parts of your project at the same time. So while one agent is building your authentication system, another is designing your dashboard and a third is writing your API. Large tasks get broken up automatically and when everything's done, it all merges back together. You stay in control the whole time. You're just getting dramatically more done.

I built a daily insight hub, a personal productivity dashboard in about 10 minutes. What used to take me hours, multiple tools, multiple tabs, constant back and forth. This time it just happened. The moment that got me was when I asked it to create a slide deck summarizing the app while it was still building the dashboard and watched it spin up a second task, write its own project brief, and start executing in a separate thread. all while the first agent kept working. That felt genuinely different from anything I've used before.

If you're a solo founder, a creator building digital products, a developer who hates switching tools, or someone who's been meaning to build that app idea for 2 years, Agent 4 is the version you've been waiting for. Replet has been building toward this since 2024, and you can feel it. The gap between having an idea and having a working product just got a lot smaller. Repllet is free to get started. Link is below. If you want to see what I build with this over the next few weeks, subscribe and come back. Drop a comment. What's the first thing you'd build with this?

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