Know the moment
your service goes down
Lightweight uptime checks every minute. SSL certificate and domain expiry alerts before they cause outages. Port monitoring for critical services. All in one platform.
Four checks, one platform
All infrastructure checks run on dedicated lightweight infrastructure — separate from browser-based monitoring — for fast, reliable results.
Ping & uptime
HTTP HEAD checks against your URLs. Know the moment your site goes down and when it recovers. Response time and status code tracking.
- As frequent as every 1 minute
- HTTP status code and response time
- Down & recovery notifications
SSL certificates
TLS certificate expiry checks. Configure how many days before expiry you want to be warned. Never let an expired cert take your site offline.
- Configurable alert threshold (e.g. 14 days)
- Issuer, subject, and validity details
Port monitoring
TCP connect checks on any host and port. Know instantly when a database, mail server, or custom service stops responding.
- Any TCP port on any host
- Open/closed state-change alerts
Domain expiry
WHOIS-based domain registration tracking. Get reminded well before your domain lapses. Supports 20+ TLDs.
- Configurable alert threshold (e.g. 30 days)
- Registrar and expiry date details
State-change alerts, not constant noise
You get notified when something breaks and again when it recovers. Not every 60 seconds while it's still down.
Instant detection
Checks run as often as every minute. The moment a state change is detected, your alert fires.
No alert storms
One alert when service goes down. One alert when it recovers. Not a flood of repeated notifications.
Multi-channel
Email, Slack, Discord, webhooks, Zapier, and n8n. Route alerts to the right team automatically.
Infrastructure + content monitoring in one platform
ChangeNotifier isn't just an uptime checker. Combine infrastructure monitoring with visual, text, and element-level web page tracking. One dashboard for everything.
Don't wait for users to tell you it's down
Start monitoring uptime, SSL, ports, and domains in under 2 minutes.
Start monitoring free