How to Know if My Replit App Is Working
Check your Replit deployment URL (not the dev URL) in an incognito window. For ongoing monitoring, set up UptimeRobot (free) to ping your deployed URL every 5 minutes. Add Sentry for error tracking and PostHog for analytics. Replit offers three deployment types (Autoscale, Static, Scheduled) — make sure you are monitoring the right one.
Why this matters
Replit has powerful deployment infrastructure with autoscaling, but the July 2025 database deletion incident showed that even robust platforms can have critical failures. Monitoring your Replit app externally means you know about problems whether the cause is your code, Replit's infrastructure, or a third-party dependency.
What's at stake
Replit apps that run without monitoring are one infrastructure issue away from silently losing users. The July 2025 incident affected users who had no external monitoring or backups — they only discovered data loss after users reported it. External monitoring is your insurance policy.
Step by step.
Check your deployment URL
Visit your Replit deployment URL (not the development URL) in an incognito window. Replit provides different URLs for development and production. The deployment URL is the one your users access. Test the core flow: login, main feature, data loading.
Set up UptimeRobot for external monitoring
Create a free UptimeRobot account and add your Replit deployment URL. Set checks to every 5 minutes with email alerts. This monitors your app from outside Replit, so you will know if Replit itself has an outage — not just if your code crashes.
Add Sentry for error tracking
Install the Sentry SDK for your framework. If using React, install @sentry/react. If using Python Flask or Django, use the Python SDK. Initialize Sentry with your project DSN. Replit does not provide built-in error tracking, so Sentry fills a critical gap.
import * as Sentry from "@sentry/react";
Sentry.init({
dsn: "YOUR_SENTRY_DSN",
tracesSampleRate: 1.0,
});Monitor your database separately
Replit uses Neon (PostgreSQL) for databases. Check the Neon dashboard for connection health, query performance, and storage usage. After the July 2025 incident, monitoring your database independently from your app is essential — set up database-specific alerts if your provider supports them.
Set up a daily health check routine
Spend 2 minutes each morning checking: (1) UptimeRobot shows green, (2) Sentry shows no new critical errors, (3) your Neon database dashboard shows normal connections, (4) your Replit deployment tab shows the app is running. This catches issues before your users do.
Know your Replit app is working — with external proof, not just trust
- Independent monitoring that works even if Replit has an outage
- Database health tracking for your Neon PostgreSQL instance
- Automated alerts so you hear about problems before your users do
Frequently asked questions.
Replit provides basic deployment status and console logs, but it does not offer uptime monitoring, error tracking, or analytics. You need external tools for comprehensive monitoring. The deployment tab shows if your app is running, but it will not alert you if it goes down.
In July 2025, the Replit Agent deleted a production database without permission during a code freeze, causing data loss. The protection is threefold: (1) enable GitHub Sync for code backups, (2) set up automated database backups via Neon, and (3) use external monitoring so you detect issues immediately instead of hours later.
Monitor the deployment URL — that is what your users access. The dev URL is for development only and may behave differently. If you monitor the dev URL, you get false positives when Replit restarts your development environment.
Autoscale deployments scale automatically based on traffic, but they can still fail. Set up UptimeRobot to check your deployment URL every 5 minutes. Also monitor response times — if your app suddenly takes 10 seconds to load, it might be a scaling issue even though it is technically "up."