Vigilmon vs AppSignal: Uptime Monitoring vs Developer-Focused APM
AppSignal and Vigilmon both help developers keep their applications healthy. But they focus on different layers of the monitoring stack. This comparison helps you understand what each tool does and when to use which.
Quick Comparison
| Factor | Vigilmon | AppSignal |
|---|---|---|
| Primary focus | External uptime monitoring | APM + error tracking + metrics |
| Setup | No code change, add a URL | Install SDK, instrument code |
| Languages | Any (HTTP-based) | Ruby, Elixir, JavaScript, Node |
| What it catches | Endpoint unreachable, slow response | Exceptions, slow queries, N+1s |
| Multi-region | Yes, consensus-based | No (SDK inside your app) |
| Status pages | Yes (built-in) | Yes (add-on) |
| Pricing | Free tier | Starts at $19/month |
What AppSignal Does
AppSignal is an application performance monitoring (APM) tool built specifically for developers. It monitors:
- Error tracking: Unhandled exceptions with full stack traces
- Performance monitoring: Slow requests, database queries, N+1 queries
- Custom metrics: Counters, gauges, histograms you define
- Uptime monitoring: Basic external checks (add-on feature)
- Anomaly detection: Alert when metrics deviate from baseline
AppSignal is particularly popular in the Ruby on Rails and Elixir/Phoenix communities.
What Vigilmon Does
Vigilmon monitors external endpoint availability from multiple geographic regions. It checks whether your URLs return successful responses, measures response time, and uses consensus alerting to eliminate false positives.
The Core Difference
AppSignal looks at your application from the inside — via an SDK that hooks into your framework and instruments code execution.
Vigilmon looks at your application from the outside — via HTTP requests from multiple regions that simulate what real users experience.
What AppSignal Misses That Vigilmon Catches
- Your server is completely offline (SDK cannot report if the process is dead)
- DNS resolution failure (users cannot reach your app at all)
- Network issues between users and your server
- CDN serving stale error pages
- SSL certificate expiry before it causes exceptions
- Deploy caused the app to stop accepting connections
What Vigilmon Misses That AppSignal Catches
- Ruby exceptions and stack traces
- N+1 database queries
- Memory leaks and performance regressions
- Background job failures
- Slow API calls to external services
AppSignal's Uptime Feature vs Vigilmon
AppSignal does include uptime monitoring as an add-on feature. The difference:
- AppSignal uptime: Basic HTTP checks from a limited number of locations
- Vigilmon: Multi-region consensus checks that eliminate false alerts; dedicated uptime-first product
For teams already using AppSignal, Vigilmon can replace or supplement AppSignal's uptime feature with more reliable multi-region checking.
Using Both Together
For complete coverage:
- Vigilmon: Monitors external endpoint availability, catches infrastructure-level failures
- AppSignal: Monitors code-level performance and errors within your app
Workflow:
- Vigilmon alerts: "Your /checkout endpoint is returning 503 from all regions"
- AppSignal provides: "Unhandled DatabaseConnectionError in CheckoutsController#create"
Cost Comparison
| Tier | Vigilmon | AppSignal |
|---|---|---|
| Free | 5 monitors, forever | No free tier |
| Entry paid | Affordable | $19/month (starter) |
| Stack | Uptime focused | Full APM stack |
Conclusion
Vigilmon and AppSignal complement each other in a complete monitoring strategy. Vigilmon tells you when your application is unreachable. AppSignal tells you why it is misbehaving.
If you are using AppSignal, add Vigilmon for external multi-region uptime checking — the free tier covers 5 monitors with no credit card.
Start free at vigilmon.online — 5 monitors, no credit card, live in 2 minutes.