Is Replit safe?

Is a Replit app safe to ship?

Replit Agent can scaffold, install packages, and run database migrations without you leaving the browser. Two things are worth checking before real users show up: who can see your source, and whether your database is locked down.

Run the 60-second self-check →Or run the free Leak Check
Credit where it's due

What Replit actually does well

Full dev environment and deploy pipeline in the browser, nothing to install locally.

Replit Agent can install dependencies and run migrations on its own, which speeds up early iteration a lot.

One-click deploys make it easy to get something live fast, which is the whole point.

The gap

The gap: public Repl visibility and RLS-off databases

Every Repl has a visibility setting, Public or Private, and it is easy to leave a project on Public while iterating, which means anyone can view your source tree, including a .env file if one was ever committed to it. Separately, if Replit Agent wires up Supabase or a Postgres database for you, the same row-level security default applies as with any other AI builder: tables ship open unless a policy says otherwise.

60-second self-check

Check Replit for this yourself right now

Two checks, about 60 seconds combined.

  1. 01

    Open your Repl's settings and confirm the visibility is set to Private, not Public, especially if it has ever held a real API key.

  2. 02

    If your app uses Supabase, open devtools Network tab on the live app, find the supabase.co request, and copy the apikey header.

  3. 03

    Run: curl "https://<your-project>.supabase.co/rest/v1/<table-name>?select=*&limit=1" -H "apikey: <anon-key>" and check whether rows come back with no login.

  4. 04

    If rows come back, RLS is not enforced on that table and it is readable by anyone holding the key.

Rather not do this by hand? The free Leak Check runs the anon-key probe and a client bundle scan against your live URL and gives you results in under a minute.

Run the free Leak Check →

Where the numbers come from

We scanned 66 live apps built with Lovable, Bolt, Cursor, base44, and Tempo. 41% of the Supabase-backed apps had at least one table anyone could read with the public anon key. The full methodology and findings are in the data report.

Read the data report →
FAQ

Common questions about Replit security

It solves source-tree exposure, meaning nobody can browse your files or find a committed .env. It does not solve database-level exposure. Those are two separate checks and both matter.
Probably on that specific risk, but check anyway, it is common for a key to get pasted into a config file or a comment during a debugging session and forgotten. A quick file search for common key patterns is worth the two minutes.
Not by default, no. It wires up the connection and creates tables that work for your prompt, the same way most AI builders do. Enabling RLS is a manual step in the Supabase dashboard, or in your Postgres provider's equivalent access control.
The RLS-specific check does not apply, but the same idea does: test whether your database or API can be queried directly without a session, using curl or an incognito window, the same way described in the self-check.
Yes, the free Leak Check below runs the anon-key and bundle-secret checks against your live URL automatically.
Check another builder

Is your builder safe?

Is Lovable safe? →Is Bolt safe? →Is Cursor safe? →Is v0 safe? →Is base44 safe? →