Website Health Monitor & Uptime Checker
Keep your websites online, secure, and fast. Monitor downtime, expiring SSL certificates, broken links, redirect loops, and essential HTTP response headers around the clock.
Audited on
Diagnostic Findings & Health Actions
Certificate Validity & Expiration
Authority & Subject Details
Hop-by-Hop Redirection Path
Clean redirect paths preserve crawl budget, reduce latency, and prevent 301 loops.
Defensive HTTP Response Headers
Grade (%) • Protect your site against XSS, clickjacking, and content sniffing.
Sign in to Save & Monitor Your Websites
Get 1 website monitored completely free with automated checks every 6 hours, downtime email notifications, and SSL expiry warnings.
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Add your first website to start continuous 24/7 monitoring for downtime, SSL expirations, and broken links.
Free vs. Pro Website Monitoring
Choose the frequency and power suited for your applications.
Free Plan
Ideal for personal blogs and landing pages.
- 1 Monitored Website
- Checks every 6 or 24 hours
- Unlimited On-Demand Instant Audits
- Automated Email Downtime Alerts
- 7-Day Health Check Retention
- High-frequency 5-minute checks
- Webhooks (Discord, Slack)
Pro Plan
For production SaaS, client sites, and mission-critical APIs.
- Up to 15 Monitored Websites
- 5-Minute & 15-Minute Rapid Checks
- Instant Downtime, Recovery & SSL Expiry Alerts
- Discord, Slack & Custom Webhooks
- 90-Day Analytics & Historical Latency Charts
- Scheduled Weekly Executive PDF Digests
Why Website Health Monitoring is Critical for Developers and Businesses
Modern websites and web applications are living systems that evolve daily. Server configurations change, SSL certificates near expiration, external APIs experience intermittent degradation, and content edits can accidentally introduce broken 404 links or redirect loops. Without automated health monitoring, your customers or search engines are usually the first to discover when something goes wrong.
DevToolbox Website Health Monitor transforms isolated debugging into continuous protection. Instead of running one-off audits manually, you get continuous oversight over your domain’s uptime, SSL validity, redirect paths, security header posture, and internal link integrity.
What Does the Website Health Engine Inspect?
- Uptime & Latency: Measures precise Time to First Byte (TTFB) and HTTP response codes. Distinguishes between operational, degraded (slow response > 1.5s), and down states (5xx errors, connection timeouts, or DNS failures).
- SSL Certificate Expiration & Security: Extracts TLS certificates via direct socket handshakes. Tracks remaining days until expiration, issuer authority, SAN coverage, and alerts you before your certificate expires.
- Redirect Chains & Loop Detection: Follows every redirection step (301 Permanent, 302 Temporary, 307/308). Highlights redirect loops and confirms canonical HTTP-to-HTTPS and www vs non-www enforcement.
- HTTP Response Headers & Security Grading: Audits critical headers including HSTS, Content-Security-Policy (CSP), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and flags server framework leakage. Assigns an automated A+ to F security grade with ready-to-use configuration snippets.
- Broken Link Scanner: Recursively examines on-page anchors, testing destination URLs to identify dead 404 links, redirect hops, and network timeouts that harm SEO rankings.
Free vs. Pro Monitoring Capabilities
DevToolbox offers flexible monitoring tailored for solo developers, indie hackers, and growing agencies:
| Feature | Free Plan | Pro Plan |
|---|---|---|
| Monitored Websites | 1 Website | Up to 15 Websites |
| Check Frequency | Every 6 hours or 24 hours | Every 5m, 15m, 30m, 1h, 6h, 24h |
| On-Demand Instant Audits | Unlimited | Unlimited |
| Instant Email Alerts | Downtime alerts | Downtime, Recovery, SSL Expiry & Broken Links |
| Webhook Notifications | Not included | Discord, Slack & Custom Webhooks |
| Historical Retention | 7 Days | 90 Days with latency charts |