Is my v0 app safe to launch?

Paste your address. We check your live v0 app the way a stranger would, then tell you in plain English what could cost you money, and how to fix it.

Free. No sign-up. We check the one page you give us, and only what any visitor can already see.

Could end your business

Anyone on the internet can read your customer list.

what we didasked your site for its customer list, without signing in

what it showedthe whole table, with names, emails and phone numbers

What it means for youNo login, no password, no attacker needed. Someone who finds the address copies the whole table. This is the kind of leak you may have to tell every customer about.

This is how every finding is written. No jargon, ever.

About v0

Working is not the same as safe.

v0, from Vercel, turns a description into a working interface and the app behind it. It is strongest at the part people see and click, and it will happily write the code that talks to your database too.

Where your data livesv0 connects a database through the Vercel Marketplace, most often Supabase or Neon. Where it is Supabase, the read-rule question applies. Where it is Neon, which is plain Postgres, your app’s own code is the only thing deciding who can read what.

What we find

The faults we find in v0 apps.

Written the way your own report would write them. These live in the app v0 built for you, not in v0’s own service, which is why only a check of your app answers it.

Could end your business

Your app takes a visitor at their word about who they are.

What it means for youSomeone asks for customer 124's details and is handed them, because nothing ever checked they were customer 124. Every record becomes reachable one number at a time.

what we didread the code where your app decides whose data to send back

what it showedno check that the person asking owns what they asked for

Could end your business

Your master key is in the code every visitor downloads.

What it means for youThat key ignores every rule you set about who may see what. Anyone who looks can read, change or delete everything you hold, including every customer record.

what we didread the code your site hands to every browser

what it showeda master key, in a file any visitor can open

The honest part

What this check cannot see.

Every scanner looks cleaner if it stays quiet about what it missed. We would rather tell you.

Could not check

Reading the code that decides who may see what needs you to connect the project. Without it we check everything reachable from outside and tell you plainly which questions we left unanswered.

If the answer is yes

You found something. Now what?

v0 writes the part people see, so what it hands you is usually a front end plus whatever you connected behind it. The faults worth fixing first are almost always in that connection: which database, which key, and what rules sit on the tables.

The free check works from your live address and tells you what is reachable from outside. Paying gets you the words to fix each one, written for the tool you are editing in, and a re-check that says whether it worked.

What a plan adds →

Before you paste your address

Questions from people who built with v0.

v0 only made my interface. Is there anything for you to check?: Yes, and often more than people expect. An interface has to fetch data from somewhere, and that connection is where the mistakes live: a key in the page, a table with no rule on it, a request that trusts whatever the browser sends. We check the live app rather than the design.
I connected a database through the Vercel Marketplace. Does that set it up safely?: It provisions it and connects it. It does not decide who may read each table, because only you know which tables are meant to be public. That decision is left to you, and if nobody makes it the answer defaults to everybody.
My v0 app is behind Vercel password protection. Does that cover it?: It covers the pages. It does not cover the database, which your app reaches directly and which answers whoever asks with the right address. We would tell you the site is protected and then check what is reachable behind it anyway.

Check one thing at a time

Free checks for a v0 app.

Is my database readable by anyone?Check my database →Is a secret key sitting in my website?Check for exposed keys →Can anyone find me on Google?Check if I can be found →

Where these facts come from