One platform to monitor your website's health.
JustChecker continuously checks your website and alerts you when something goes wrong - covering uptime, SSL/TLS, domain expiry, DNS, performance, and security, all from one dashboard.
No credit card required · Free plan available
DNS Monitoring
Continuously monitor your A, AAAA, CNAME, MX, NS, and TXT records. Detect unexpected DNS changes early and get instant alerts before they impact your website, email, or users.
No credit card required · Free plan available
SSL Monitoring
Continuously monitor your SSL/TLS certificates, detect upcoming expirations, and receive timely alerts to prevent security warnings, downtime, and loss of visitor trust.
No credit card required · Free plan available
Domain Expiry Monitoring
Track your domain expiration dates and get timely alerts before they expire. Stay ahead of renewals, prevent unexpected downtime, and keep your domains active without missing important deadlines.
No credit card required · Free plan available
Response Time Monitoring
Monitor your website’s response time from multiple locations. Detect slowdowns early, analyze performance trends, and identify bottlenecks before they affect your users.
No credit card required · Free plan available
A website monitoring platform that watches everything for you
Websites break in ways you don't see until a visitor - or a customer - does: an expired certificate, a lapsed domain, an unexpected DNS change, or the server simply going down. JustChecker checks for all of it automatically, around the clock, and alerts you the moment something needs attention - no manual checking required.
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
Latest posts
Stay in the loop
Product updates and monitoring tips - no spam, unsubscribe any time.