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Guides and resources on uptime monitoring, SLAs, and building reliable services.
Fundamentals
Start here if you're new to uptime monitoring or want to understand the basics.
What is Uptime Monitoring?
A complete guide to monitoring website availability, detecting outages, and keeping services reliable.
Read guideWhat is an SLA?
Service Level Agreements explained: uptime guarantees, what the numbers mean, and why they matter.
Read guideSLA Uptime Levels
Compare 99.9% vs 99.99% vs 99.999% uptime. What each level means and which one you need.
Read guideWhat is MTTR?
Mean Time to Recovery explained: how to measure and improve your incident response times.
Read guideWhat is a Dead Man's Switch?
Heartbeat monitoring explained: how to detect silent failures in cron jobs and scheduled tasks.
Read guideIncident Response Best Practices
Handle outages like a pro: from detection to resolution to postmortem.
Read guideFree tools
Calculate, check, and reference—no account required.
Uptime/SLA Calculator
See what any uptime percentage means in real downtime per year, month, and week.
Use calculatorStatus Page Templates
Copy-paste templates for incident updates, maintenance notices, and postmortems.
View templatesPostmortem Template
A lightweight, blame-free incident postmortem template with examples.
View templateCron Heartbeat Helper
Generate heartbeat schedules and curl commands for cron job monitoring.
Use helperCompare tools
Find the right monitoring tool for your team.