Next.js web apps

Your web product, fast from the first click.

Fast, SEO-friendly web products on Next.js — from marketing sites to full-scale applications on one modern stack. Free working prototype in 1 day, then a production release at a fixed price and date.

Next.jsReactTypeScript

Get your free prototype 30-min call · no commitment

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app/page.tsxAI

export default async function Page() {

const plans = await getPlans()

return (

<main>

</main>

)

}

Senior review · approved

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At a glance

One product. One price, one date.

The essentials, before you book a call.

UDEX builds Next.js web apps for founders and product teams. Fast, SEO-friendly web products on Next.js — from marketing sites to full-scale applications on one modern stack. AI writes the code, tests and CI/CD, while senior engineers own the architecture and review every change.

1 dayFree prototypeNo payment, no commitment

FixedPrice and dateAgreed before we start

100%YoursCode, repository and accounts

Platform: Web, server-rendered with Next.js
Ships to: Production
Stack: Next.jsReactTypeScriptConvexVercel
Quality: Senior review on every change, automated tests, CI/CD

How it works

Idea to production. In three steps.

AI does the heavy lifting. Senior engineers make every decision that matters.

01Day 0
Share the idea
A 30-minute call. We agree on the core flow, the scope and a fixed release date.
02Day 1 → release
AI builds, senior engineers decide
AI writes the code, tests and CI/CD. Senior engineers set the architecture and review every change. Your prototype is ready on day 1.
03Release day
Ship to production
The release goes live, and the code, repository and accounts are handed to you.

Who it’s for

Built for founders and product teams.

Here is where it works best, and where it doesn’t.

SaaS founders

Public marketing pages and the logged-in app on one modern stack.

Products that live on search

Server rendering and fast pages that rank and convert.

Marketplaces and booking

Listings, search, checkout and dashboards in one product.

AI-first products

Chat, generation and streaming responses built into the web app.

Founders outgrowing no-code

Rebuild a no-code MVP as a Next.js app you fully own.

Teams modernising legacy sites

Move an old stack to Next.js without losing traffic.

Not the right fit

Native-only mobile features at launch: pair it with an iOS or Android app.
Static brochure sites that a website builder handles well.
Certified compliance from day one, such as HIPAA or PCI audits.
Open-ended hourly work without a defined first release.

How we work

Six stages, one team.

All services

Pricing

Start free. Ship at a fixed price.

Two steps. The prototype costs nothing, and the release costs exactly what we agree.

Prototype

Free1 day

A working prototype of your core flow to test with users and show investors.

Key screens and the main user flow
Working on real devices and browsers
No payment, no commitment

Get the free prototype

Release

Fixed priceand date, agreed upfront

A production release, shipped to production, that you fully own.

Next.js, React, TypeScript and the features agreed on the call
Automated tests, CI/CD and senior code review
Release to production and 100% code ownership

Start with a call

Fixed means fixed. No hourly billing and no surprise invoices: anything new is priced before it is built.

Book a call

Thirty minutes. Then your prototype.

Walk us through the idea, and we will scope the core flow and build your free prototype the next day.

Book a 30-min call

FAQ

Questions, answered.

Straight answers about cost, timing, quality and ownership.

How much does it cost to build a Next.js web app?

The price is fixed for the agreed scope and set before work starts. You first get a free working prototype of the core flow in 1 day, then a fixed price and release date for the production version.

How long does it take to build a Next.js web app?

A working prototype takes 1 day. The production release date is agreed upfront and depends on the scope; AI speed with senior engineering makes it much faster than classic development.

Where is the app hosted?

On Vercel or your own cloud. Everything runs under your accounts, and we set up monitoring and backups.

Will it be fast and SEO-friendly?

Yes. We use server rendering and static generation, and keep performance budgets with Lighthouse checks on every release.

Can you add payments and authentication?

Yes. Sign-in, roles, Stripe payments and analytics are standard parts of the build.

Is the prototype really free?

Yes, with no commitment. After a 30-minute call we build a working prototype of your core flow in 1 day, and then you decide whether to continue to the release.

Will the price go up during the build?

No. The price is fixed for the agreed scope. Anything new you want to add mid-build is priced separately and built only after you approve it.

Who owns the code?

You do, 100%. The source code, repository and accounts are yours, and the release ships to production under your name.

Is AI-written code safe to ship to production?

It ships only after senior review. Senior engineers own the architecture, security and code quality, and automated tests run on every change.

In practice