The Backstory
A few weeks ago I had an idea for a side project: a simple SaaS tool to help freelancers track their client invoices and send automated reminders. Nothing groundbreaking — but the kind of thing that would have taken me a full weekend of boilerplate, auth setup, database schema wrangling, and deployment headaches.
I decided to try something different. I wanted to see how far I could get with a vibe coding approach — describing what I wanted in plain English and letting AI handle the heavy lifting.
What Is Vibe Coding, Really?
"Vibe coding" has become a bit of a meme in developer circles, but the core idea is genuinely interesting: you describe the app you want, the AI writes the code, runs it in a real container, catches its own errors, and deploys it — while you stay in the product-thinking mode rather than getting lost in syntax.
The key word there is real. A lot of AI tools generate code that looks plausible but breaks the moment you run it. The difference-maker is whether the AI actually executes the code and validates it against acceptance criteria, or just hands you a text file and wishes you luck.
The Tool I Used: NxCode
After trying a few options, I landed on NxCode — an AI app builder that uses a dual-agent architecture it calls Conductor + Virtuoso. The Conductor handles task planning and acceptance criteria; the Virtuoso writes and iterates on the actual code inside an isolated Docker container.
What stood out:
- Real Docker execution — code actually runs in a container, not a browser sandbox simulation
- Acceptance criteria driven — every task is verified against a spec before it's marked done
- Auto error detection — up to 3 automatic debugging iterations before it flags you
- One-click deploy — pushes to Cloudflare's edge network when you're ready
The Lite plan starts at $5/month, which felt like a reasonable experiment budget.
What I Built (and How Long It Took)
I opened NxCode Studio and typed:
"Build a SaaS app where freelancers can add clients, create invoices with line items, and set up automated email reminders when invoices are overdue. Users should be able to log in with Google. Dashboard shows outstanding vs paid invoices."
That was my entire brief. No schema. No tech stack decision. No Dockerfile.
Here's roughly what happened over the next 2 hours:
0–15 min: NxCode scaffolded the project — Next.js frontend, a Node backend, PostgreSQL schema, Google OAuth integration. It ran the whole thing in a container and confirmed the auth flow worked before moving on.
15–45 min: Invoice CRUD, line-item calculations, status tracking. It caught a timezone bug in the due-date logic on its own and fixed it without me noticing until I read the logs.
45–90 min: The email reminder system. It set up a cron job, integrated with Resend for transactional emails, and wrote the reminder templates. I gave one round of feedback: "Make the reminder email less formal, more like a Slack message." It rewrote the template.
90–120 min: I reviewed the UI, asked for a couple of cosmetic tweaks (different color for overdue status, add a "copy invoice link" button), and hit deploy.
Two hours. Deployed. Live URL.
What Actually Impressed Me
The part that genuinely surprised me wasn't the speed — it was the quality of the error handling. When the email integration failed on the first attempt (wrong API key format), NxCode caught the runtime error, diagnosed it, fixed the integration code, and re-ran the tests. I only knew about it because I checked the build log afterward.
That's the difference between a tool that generates code and a tool that ships code.
Caveats
This isn't magic, and I want to be honest:
- Complex custom business logic still benefits from a developer reviewing the output
- If you have very specific UI requirements, you'll spend time in feedback loops
- The $5 Lite plan's 200 credits goes faster than you'd expect on a mid-complexity app — I'd budget for the $20 Pro plan for anything serious
Who This Is For
Honestly? Anyone with a product idea who's been blocked by the "I need to learn to code first" bottleneck. NxCode isn't trying to replace senior engineers building distributed systems — it's trying to get non-technical founders and solo builders from idea to deployed product without the gatekeeping.
If you've been sitting on a side project idea because the setup felt too daunting, give it a try. The free tier is genuinely free (no credit card required).
Have you tried vibe coding for a real project? What was your experience? Drop it in the comments — I'm curious whether others are finding the same quality gap between "generates code" and "ships code" tools.
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