Built with Replit

It ran in the workspace. On your domain it returns a 500.

The workspace is a generous place to build: it hands your code a port, a filesystem and a database without being asked. Deployment takes all three away, and the five faults below are the ones that go with them.

What usually breaks in Replit

It runs in the workspace and 500s on a domain

The workspace starts your program the way it likes and shows you the result; the deployment runs the start command written in the project and nothing else. If that command was never the one you were actually using, the deployed process either fails immediately or serves something that was never meant to face the public.

The port is hardcoded to the one the workspace gave it

Your server listens on a number typed into the source, and the deployment tells the process which port to use through the environment instead. Nothing is listening where the traffic arrives, so every request times out or returns an error page from the platform rather than from your app. One line reads the assigned port and this stops happening.

File paths that only exist inside the workspace

Uploads written next to the code, a JSON file used as storage, a folder created by hand while testing. The deployed filesystem starts clean and does not keep what you write to it between restarts, so reads fail and writes evaporate. This one usually means moving those files somewhere that is meant to hold them.

Secrets that were never wired to the deployed process

Secrets set for the workspace are not automatically the secrets the deployment runs with, and a missing one rarely announces itself: the value arrives as undefined and gets concatenated into a URL or a header. The error you see is from the service you are calling, which sends everyone looking in the wrong place.

The database is the workspace's scratch copy

The data you have been developing against lives with the workspace, and the deployment either points at nothing or at an empty instance. Logins fail because no accounts exist, lists render blank, and the app looks broken when all that is wrong is a database nobody has filled.

Will the fix change how I keep working in the workspace?
Barely. Reading the port and the secrets from the environment works in both places, so you get one project that runs in the workspace and survives deployment instead of two that disagree. You carry on developing exactly where you were.
Do I have to move off Replit to get it stable?
No. Almost everything above is a configuration fault inside your own project, and it follows you to any other host unchanged. We fix it where it is and only raise moving if your app has grown a requirement the platform does not serve.
What about the data I already have?
We copy it rather than move it, and we tell you first what is going where. If the workspace copy is the only place your real records exist, getting them somewhere durable is part of the quote, not an extra.

How it works

Audit

$199$349promo

You send a link, a repo, or both. We reproduce the problem, read the code, and record a short walkthrough: what's broken, why it broke, and what it takes to fix. You get written findings and a fixed quote.

Book my audit

Full Fix

Priced after the audit

Scoped from the audit and agreed before anything starts. We fix the cause rather than the symptom, and hand back something maintainable, with a written note on what changed and why.

Nobody can price this honestly before seeing the code. The audit is what makes a firm number possible.

The audit is a fixed price and you know it before you pay. Everything after it is quoted from what the audit actually found, and you approve the number before any work starts.

Why trust us with it

What we can show you is who does the work, what it costs, and how well we already know the failure you are staring at.

A desk at night, the walkthrough being recorded

A small agency, not a marketplace

This is run by a small web agency. The person who records your audit is the person who does the fix, so you're not being routed to an anonymous bidder.

$199$349promo

The audit stands on its own

Plenty of people take the findings and do the work themselves, or hand them to their own developer. That is a fine outcome and nothing is bundled to stop it.

Book my audit

Fixed price, agreed up front

You approve a number before work starts. If the job turns out harder than we estimated, that's ours to absorb, not a change order.

Built with one of these? You're in the right place.

Lovable
Lovable projects usually break at the Supabase edge: environment variables that never reached production, or row-level security left open on a table that holds real customer data.
Bolt
Bolt ships fast and leaves the build config behind. The deploy fails on a missing package, a Node version, or an API key that only ever existed in the preview.
Replit
Replit apps run fine in the workspace and 500 on a real domain: ports, file paths and secrets that were never wired up for the deployed process.
Cursor
Cursor edits confidently across files it has not read. Two features end up disagreeing about the same state, and the bug moves every time you fix it.
v0
v0 gives you the interface, not the wiring. Forms post to nothing, server actions are still stubs, and auth is a component rather than a session.
Windsurf
Windsurf refactors reach further than intended. Imports, types and routes drift apart until the build stops on something unrelated to what you changed.
Base44
Base44 apps hit their ceiling at data and roles: the model that fit the demo cannot carry a second kind of user without redoing what sits underneath it.
Claude Code
Claude Code writes real code, which means real dependencies, migrations and tests. When it breaks, it breaks somewhere prompting cannot reach.

What it usually turns out to be

It works locally, then 500s once deployed
Nearly always an environment variable, a build step or a file path that only exists on your machine. The code is usually fine.
The AI keeps fixing the same bug
Each pass patches the symptom because the cause sits a layer down, in the data model or in how state is shared. Prompting harder does not reach it.
Forms submit but nothing arrives
The browser gets a success back while the server quietly fails. Without error handling and logs nobody finds out until a customer complains.
Logins drop or leak between users
Session and auth code copied from an example built for a different rendering model. It looks right in testing and breaks under real traffic.

And what nobody notices until later

Security is the part an AI builder is quietest about. None of these stop the app working, which is exactly why they ship.

The database is open to anyone with the URL
Supabase and Firebase hand the browser a key on purpose — the row policies are what actually guard the data. Generated projects routinely ship with those policies off, which turns a public key into a key to everything.
Secrets that shipped to the browser
A service key pasted into a component, or one prefixed NEXT_PUBLIC_ so the build would stop complaining. It is in the page source, readable in devtools, and the bill for it is yours.
Any logged-in user can read every other user's data
The endpoint takes an id and returns that record without ever asking whose it is. Nothing looks wrong while you are the only account; change the number in the URL and you are in someone else's.
Nothing stops the same request a thousand times over
No rate limit and no real validation on the public routes, so login, password reset and checkout can each be hammered until something gives. Generated code almost never adds this on its own.

If you recognised your own problem somewhere above, that is the point. The audit is where you find out which one it actually is.

Book my audit

$199$349promo

Send it over. We'll tell you what's wrong.

One fixed-price audit at $199 instead of $349. A video walkthrough, written findings and a firm quote on what it takes to fix.

Book my audit

Book my audit

$199. Fixed price, agreed up front.

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