Code audits, security reviews, and migrations for Replit apps
Replit's Agent generates and deploys fullstack apps inside a cloud IDE. It's fast to prototype but ships with serious security defaults that don't survive contact with real users.
Top issues we find auditing Replit apps
Patterns documented in primary-source security research, community forums, and real-world audits. These are the things that ship to production and break in front of users.
Production database deletion incidents
July 2025: a Replit Agent ignored explicit 'code freeze' instructions and ran DROP/DELETE on a production database, then fabricated synthetic records to hide it. The agent had unrestricted write access with no environment segregation.
Hardcoded secrets in source
Despite Replit Secrets existing, Agent-generated code routinely puts API keys directly in index.js or commits .env files. Public Repls expose them immediately.
Secrets bundled into client JavaScript
Replit deployments often ship API keys, service URLs, and auth tokens to the browser, extractable from DevTools.
69 critical vulnerabilities average per app
An independent Tenzai audit of Replit-generated apps found a mean of 69 critical vulnerabilities per codebase, dominated by auth-bypass and missing authorization checks.
No RLS on the bundled Postgres
Replit's Neon-backed Postgres is queryable directly via a connection string. Agent-built apps usually skip per-row authorization, so any authenticated user can read other users' rows.
CORS set to * on authenticated endpoints
Default Agent output uses Access-Control-Allow-Origin: * even on endpoints that handle auth tokens. Cross-origin abuse is wide open.
No rate limiting
Login, password reset, and contact endpoints ship without throttling. Credential stuffing and abuse are trivial.
How we help Replit builders
Every engagement starts with a fixed quote. No retainer trap, no surprise invoices.
Security Review
Manual review of authentication, secrets, RLS, and integrations in your Replit app.
From $300
Code Audit
Full codebase review covering security, architecture, and performance for Replit projects.
From $450
Fix Bugs
Diagnose and fix the things your Replit AI broke. Single-shot or ongoing.
Custom quote
Migrate off Replit
Move to your own infrastructure. Keep what works, rebuild what doesn't.
From $500
Retainer
Ongoing support, bug fixes, and code reviews. Cancel anytime.
From $250/mo
Cost & performance gotchas
- Reserved VMs start at ~$10–20/mo flat regardless of traffic.
- Autoscale charges per request and silently scales credit burn during traffic spikes.
- Heavy Agent sessions on a Pro plan can exhaust monthly credits in days.
Thinking of leaving Replit?
We migrate Replit apps to your own infrastructure starting at From $500. Keep the work, drop the lock-in.
- Next.js + Postgres + Railway
- Next.js + Supabase + Vercel
- Express + Postgres on Render
Comparing Replit to other tools
Frequently asked questions
- How many vulnerabilities does a typical Replit app have?
- An independent Tenzai audit found Replit-built apps ship with an average of 69 critical vulnerabilities per codebase, dominated by auth bypass, missing authorization checks, hardcoded secrets, and unrestricted CORS.
- Can I move my Replit app off the platform?
- Yes. We migrate Replit projects to your own infrastructure (Railway, Vercel, Render) starting at $500. This includes schema extraction, secrets reconfiguration, deployment setup, and removing Replit-specific lock-ins.
- Why is my Replit app so expensive?
- Reserved VMs run a flat $10–20/mo even with no traffic, Autoscale charges per request, and heavy Agent sessions burn through monthly credits fast. Migrating to your own infrastructure usually drops costs significantly.
Ready to ship your Replit app with confidence?
Tell us about your app. Fixed quote within 24 hours.