Know the moment
something breaks.
JustChecker watches your websites' uptime, SSL, domain expiry, DNS, performance, and security around the clock - and tells you the instant something needs attention.
No credit card required · Free plan available
Everything your websites need, watched 24/7
One dashboard covering every signal that matters for keeping your sites online, secure, and fast.
Uptime Monitoring
Checks as often as every 5 minutes, with a debounced Up/Down state machine so a single flaky check never cries wolf.
SSL Monitoring
Native OpenSSL checks catch expiring or invalid certificates before your visitors see a browser warning.
Domain Expiry Monitoring
RDAP/WHOIS lookups track registration expiry so you never lose a domain to an overlooked renewal.
DNS Monitoring
A/AAAA/CNAME/MX/NS/TXT records checked and diffed against history, so unexpected DNS changes never go unnoticed.
Response Time Monitoring
DNS lookup, TCP connect, SSL handshake, TTFB, and total time - a full performance breakdown per check.
Security Headers
HSTS, CSP, X-Frame-Options and more, scored out of 100 with specific recommendations to harden your site.
Robots.txt & Sitemap
Confirms your crawler files are present and accessible, so search engines can always find and index your pages.
Website Health Score
A single 0-100 score combining all 8 signals with a letter grade, strengths, issues, and next steps.
PDF Reports
Client-ready, branded PDF reports - executive summary, charts, incidents, and recommendations in one download.
Email Alerts
Down/recovered, SSL and domain expiry alerts land in your inbox the moment they happen - never a repeat spam.
Live in under two minutes
Add your website
Paste your URL, pick a check interval, and you're monitoring.
We check around the clock
Uptime, SSL, domain, DNS, performance, and security - all automatically.
Get alerted instantly
Email alerts the moment something changes - never buried in noise.
Act with confidence
A health score, clear recommendations, and a PDF report whenever you need one.
Built for teams who can't afford downtime
No bloated dashboards, no confusing setup - just the signals that matter, checked reliably and explained clearly.
No noisy alerts
A debounced state machine means you only hear about real problems.
One score, full picture
The Health Score distills 8 signals into one number and a clear grade.
Client-ready reporting
Branded PDF reports you can hand straight to a client or manager.
Fair, transparent pricing
Plans that scale with how many sites you actually monitor.
Simple pricing that scales with you
Frequently asked questions
Trusted by teams like yours
“We used to find out about downtime from angry customer emails. Now we know before they do.”
“The PDF reports are a game changer for client updates - I just generate one instead of writing a status email.”
“Monitoring 40+ client sites used to mean 40 browser tabs. Now it's one dashboard and a health score per site.”
Stay in the loop
Product updates and monitoring tips - no spam, unsubscribe any time.