Free Tools

Uptime & Incident Response Tools

Quick utilities for reliability math, incident communication, and debugging.

No signup required. UpDog also offers uptime monitoring and status pages if you need the full workflow.

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Uptime / SLA downtime calculator

Convert 99.9/99.99 into real downtime budgets.
Most used
Best for: SLA docs, SLO reviews, uptime tables
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Status page update templates

Copy/paste incident updates for every stage.
Best for: incident comms, customer updates
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Postmortem template

A lightweight incident review template + example.
Best for: PIRs, root cause write-ups
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HTTP status codes

Search 4xx/5xx codes with causes and fixes.
Popular
Best for: debugging outages, runbooks
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SSL expiry checker

Check certificate expiry, issuer, SANs, and renewal timing.
Best for: preventing SSL-related outages
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Cron expression helper

Explain schedules and list the next run times.
Best for: heartbeat monitoring setup
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Uptime / SLA downtime calculator

Convert uptime percentages (99.9%, 99.99%) into actual downtime budgets by day, month, and year.

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HTTP status codes

Look up any HTTP status code with causes, fixes, and related codes for debugging.

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Incident response

Reliability math

Debugging

UpDog: Uptime monitoring + status pages

Monitor your sites, get alerts when things break, and keep customers informed with status pages.