Elixir web apps

Realtime web apps, without the complexity.

Realtime web apps on Elixir and Phoenix LiveView — live dashboards, collaboration and chat that update instantly, with far less code than a separate front end and API. Free working prototype in 1 day, then a production release at a fixed price and date.

ElixirPhoenixLiveView

Get your free prototype 30-min call · no commitment

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lib/board_live.exAI

def mount(%{"id" => id}, _session, socket) do

if connected?(socket), do: Board.subscribe(id)

{:ok, assign(socket, board: Board.get!(id))}

end

def handle_info({:updated, board}, socket),

do: {:noreply, assign(socket, board: board)}

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At a glance

One product. One price, one date.

The essentials, before you book a call.

UDEX builds Elixir web apps for founders and product teams. Realtime web apps on Elixir and Phoenix LiveView — live dashboards, collaboration and chat that update instantly, with far less code than a separate front end and API. 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 apps in Elixir with Phoenix LiveView
Ships to: Production
Stack: ElixirPhoenixLiveViewEctoPostgresFly.io
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.

Realtime products

Live feeds, presence and notifications out of the box.

SaaS dashboards

Numbers that update the moment data changes.

Collaboration tools

Many people editing and seeing changes together.

Chat and community apps

Millions of connections on modest servers.

Small product teams

One language for the whole app.

Teams already on Elixir

More hands for your Phoenix product.

Not the right fit

Offline-first mobile apps: pair it with a native or React Native app.
Static brochure sites: see Websites.
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.

Elixir, Phoenix, LiveView 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 an Elixir 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 an Elixir 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.

Why Phoenix LiveView instead of React?

For realtime screens it needs far less code: the server renders and pushes changes, so there's no separate API and state to keep in sync. We add React islands where rich client-side UI helps.

Is it hard to hire Elixir developers?

The community is smaller but strong; the code is clear, documented and covered by tests, so any experienced engineer can pick it up.

Does it scale?

Yes. The BEAM runs millions of lightweight processes and clusters across servers — the same platform behind WhatsApp and Discord.

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