Documentation

Check types

• HTTP / HTTPS — Monitor status code and response time
• SSL Certificate — Verify certificate trust, hostname and expiry
• DNS — Verify DNS records resolve as expected
• TCP Port — Check host:port connectivity
• SMTP — Verify email servers on ports 25 and 587
• Ping — ICMP host reachability
• API — HTTP with custom headers, body, and response assertions
• Domain Expiry — Track domain registration expiry via WHOIS
• Blacklist — DNSBL spam-blocklist listing check
• Security Headers — Verify required security response headers
• Core Web Vitals — Lighthouse performance score and LCP via PageSpeed
• Synthetic Transaction — Multi-step scripted test scenario
• Link Checker — Crawl site and find broken links
• Heartbeat — Cron / backup job monitoring via ping

Notifications

Each check can notify by email, Slack (incoming webhook URL), or SMS (Vonage). Alerts fire on a state change — when a check goes down, recovers, or a certificate enters its expiry-warning window. A check must fail twice in a row before paging, and URL checks are verified from a second location first, so a blip at one vantage point never wakes you up.

Incidents & status pages

Every confirmed outage opens an incident that tracks its duration, cause, and an AI-written post-mortem after recovery. Publish selected checks on a public status page (/s/your-slug) with 90-day uptime history, email subscribers, maintenance notices, and embeddable SVG uptime badges.

REST API & webhooks

The full API is available on every plan: manage monitors, read incidents, and subscribe webhooks that fire when a monitor goes down or recovers (the backend for our Zapier triggers). Authenticate with an X-Api-Key header — issue keys on the in-app API page, and see the OpenAPI spec for every endpoint.