Replit Agent V3 - Autonomous Coding Platform - Review

A hands-on review of Replit Agent v3: see what’s new, how it builds apps with just a prompt, and why unpredictable pricing might hold it back from being your go-to coding sidekick.

Sep 18, 2025

Last year, I wrote about Replit ( My Previous Article here) when it launched their agent for the first time. It was ambitious and I loved my first experience of building something simple like a python app, landing page etc.. Since then, we’ve seen Agent v2, design upgrades, and smoother workflows. Now, Replit has dropped Agent v3, which they call their most autonomous agent yet.

Checkout their official release here : https://replit.com/agent3

I decided to give it another spin.

No Time to Read? Here’s the Scoop

200-minute autonomous runs
Agent can now work for more than three hours without stopping. My own experiment worked for more than 1 hr to give me an output.
Self-testing in real browsers
Agent doesn’t just write code. It spins up Chrome in it’s own environment, clicks through your app, fills forms, draws on a whiteboard, and then fixes what it finds. It looks like watching a QA engineer at work.
Agents Builder - You can build automations like n8n, make, zapier with prompts
Agents can now build other agents and automations. Think Slack bots, Telegram workflows, or scheduled scripts that run every Thursday and email you an event digest . This is still early.
Two build modes
Plan Mode lets you chat through requirements, create a task list, and then send it off to Agent. Build Mode jumps straight to execution.
Themes and visual editing
Cleaner UIs with theme selectors for fonts, colors, and layouts. Apps don’t just function better — they look better too.
One-click deployments
Something they have always been known for.

Building an SEO App with Replit Agent V3

For my test, I tried making an SEO analysis app that repurposes my articles for LinkedIn, Twitter, etc., and checks the SEO. It can even suggest image styles and can generate images, but showing them is still buggy.

Replit Building Process:

When you give the prompt, it actually generates a plan of what it's going to build and it gives you two options:

Build the entire app
Start with the design

I really like how Agent gives you the “Start with design” option. It means you don’t have to jump straight into building everything at once.

First, you can focus on how your app will look—change the design, try out different layouts, and make sure you’re happy with the screens. It’s like laying out the blueprint before you start construction. Once your design is ready, Agent moves on to build the whole application for you.

The cost for building this was about $16 after 3-4 tries. — Which I felt was very expensive

The UI was spot on right from the start, and the basic features worked well. But we ran into some issues with scrolling in the editor and the SEO analysis sections, so we had to spend extra time and money debugging.

The agent could read content and suggest images, and even recommend design styles. It could create a JSON and generate an image too, but showing the image in the app wasn’t working yet—that’s still a bug.

Overall, I’m pretty impressed. With just one prompt, Agent managed to build about 60-70% of a working app. That’s not bad at all.

Check out the video of the product below:

My Wishlist for Replit Agent v4

Here’s what would make Agent more usable (and trusted):

Upfront cost estimates — show projected spend before starting a build.
Bring back choice — let users switch between Agent 2 and 3.
Simplify trivial edits — inline editing for small text/UI changes without burning tokens.
Transparent tracking — keep project usage meters visible.
Smarter rollback controls — let me approve Agent’s fixes before they apply.

Verdict

Replit Agent v3 is technically impressive. Watching it test apps in Chrome and build workflows really feels next-level. But the pricing model and unpredictability are turning excitement into frustration.

One thing I don’t like about Replit Agent v3 is that the pricing isn’t clear—you never know exactly how much you’ll be charged. It feels credit-hungry and more expensive than the older versions.

It’s best to use Replit Agent V3 for small to medium projects. It’s actually pretty good for quickly building a working MVP to show to clients.

If you’re just prototyping or experimenting, Agent v3 is a great tool. But if you need predictable costs or want to make frequent small edits, it can feel risky and expensive.

For now, I see it as a powerful demo tool and MVP accelerator. For production use, I’d wait for Replit to make the pricing more transparent and easier to control.

Check out my previous reviews: