Vigilmon vs Sentry: Uptime Monitoring vs Error Tracking — Do You Need Both?

Sentry and Vigilmon both help you know when something is wrong with your application. But they catch completely different types of problems. Understanding the distinction will help you build a monitoring strategy that catches every failure mode.

Quick Comparison

Factor	Vigilmon	Sentry
What it catches	Endpoint down / unreachable	Code errors and exceptions
How it checks	External HTTP requests	SDK inside your application
Setup	Add a URL, no code change	Install SDK, wrap your app
False alert prevention	Multi-region consensus	Error grouping + thresholds
Status pages	Yes (built-in)	Available (paid)
Pricing	Free tier (5 monitors)	Free tier (5k errors/month)

The Core Difference

Sentry catches errors that happen inside your running application. An unhandled exception, a failed database query, a JavaScript error in the browser — Sentry sees all of these. But Sentry does not check whether your app is actually reachable from the internet.

Vigilmon checks from outside your application whether users can reach your endpoints. It does not know why an endpoint is failing — only that it is (or isn't).

What Sentry Misses

• Your server is completely offline (Sentry cannot report if the app is not running)
• Your DNS is broken (no requests reach your app, so no Sentry events)
• Your CDN is serving a cached error page
• A networking issue between users and your server
• SSL certificate expired (users see a cert error before reaching your app)

What Vigilmon Misses

• An endpoint returns 200 OK but contains broken data (happy path exception)
• JavaScript errors in the browser
• Slow queries that degrade performance but don't cause timeouts
• Background job failures that don't affect HTTP responses

They Work Together, Not Against Each Other

A production-ready monitoring setup uses both:

Vigilmon:
✓ Website is reachable from EU, US, and APAC
✓ /api/health returns 200 OK
✗ /checkout is timing out from all regions → ALERT

Sentry (same moment):
✓ No new exceptions
✗ DatabaseTimeoutException on CheckoutController → ERROR

Vigilmon tells you the user-facing impact. Sentry tells you the root cause. Together they give you the full picture.

Real-World Failure Scenarios

Scenario 1: Server Out of Memory

• Vigilmon: Detects endpoint returning 500 errors across all regions, alerts immediately
• Sentry: Captures the out-of-memory exceptions with stack traces

Scenario 2: Silent Database Connection Pool Exhaustion

• Vigilmon: Detects slow response times escalating to timeouts, alerts
• Sentry: Captures the connection pool exceptions showing which queries failed

Scenario 3: DNS Misconfiguration After a Domain Change

• Vigilmon: Detects the endpoint is unreachable, alerts within minutes
• Sentry: Silent (no requests reach the app, no exceptions to capture)

Scenario 4: JavaScript Error Breaking the Checkout Flow

• Vigilmon: Does not detect (server returns 200, page loads)
• Sentry: Captures the JS exception and shows affected users

Setting Up Both

Vigilmon setup (2 minutes):

1. Sign up at vigilmon.online
2. Add monitors for your key endpoints
3. Add email/webhook alert

Sentry setup (5-10 minutes):

1. Sign up at sentry.io
2. Install the Sentry SDK for your framework
3. Configure your DSN

Budget Considerations

Both have free tiers:

• Vigilmon: 5 monitors, 5-minute checks, free forever
• Sentry: 5,000 errors/month, 10,000 transactions, free forever

For many small teams and startups, both free tiers together give comprehensive coverage.

Conclusion

Vigilmon and Sentry are complementary tools that catch different failure modes. Vigilmon tells you when users cannot reach your app. Sentry tells you why your app is misbehaving.

For complete production monitoring, you want both. Start with Vigilmon for external uptime visibility — it is free and takes 2 minutes to set up.

Start free at vigilmon.online — 5 monitors, no credit card, live in 2 minutes.