Site health monitor

Serhii Krasnikov

About this app

Overview
Site Health Check helps you monitor domains and get timely alerts before important events like certificate or registration expiry. It combines automated checks with manual lookups so you always know the current state of your domains.

Key features

Domain expiry monitoring — track expiresAt and receive notifications ahead of time based on a configurable lead time.

RDAP and WHOIS lookups — run live lookups to fetch registration and registry data for a domain.

Serial and nameserver checks — detect changes in zone serial numbers and nameserver lists and notify you when they differ from the saved values.

Custom notification timing — set how many minutes/days before expiry you want to be notified.

Per-task check interval — configure how often each domain is checked; minimum safeguards prevent overly frequent polling.

Automatic scheduling — background scheduling of periodic checks using a reliable worker mechanism so checks continue without manual intervention.

Smart update handling — when a domain’s data changes, the app can update the stored task and optionally notify you, avoiding duplicate alerts.

Simple UI for adding and editing tasks — quick domain checks, prefill fields from lookup results, and save tasks with one tap.

Why it helps

Avoid surprises — get notified before a domain or certificate expires so you can renew on time.

Detect configuration drift — nameserver or serial changes can indicate DNS misconfiguration or unauthorized changes; the app highlights those differences.

Save time — automated checks and scheduled workers reduce manual monitoring overhead.

Flexible control — tune notification lead times and check intervals per domain to match your operational needs.

How to use

Add a domain and run a quick RDAP/WHOIS check.

Review and accept parsed values (registration date, expiry date, serial, nameservers).

Configure notify before and check interval values.

Save the task — the app will schedule periodic checks and notify you when conditions are met.

Best practices

Use conservative check intervals for public domains to avoid unnecessary requests.

Set a reasonable notify lead time (for example, 7–30 days) depending on how long renewals take.

Keep serial and nameserver checks enabled for critical domains to detect unexpected changes early.

Get started
Add your first domain, run a lookup, and set a notification lead time. Site Health Check will handle the rest — monitoring, comparing, and alerting so you can focus on running your services.

Support and feedback
If you find an edge case or want a feature (custom notification channels, team sharing, or advanced scheduling), share feedback through the app so future updates can better match your workflow.

What’s new

An attempt has been made to preserve the database between version updates.
Added several translations for several pages.