SSL certificate & domain expiry monitoring before it costs you

CertBeacon watches your certificates and domains 24/7. Get alerts before expiry — via Email, Slack, Discord, ntfy or Webhook. Free for personal use.

• No credit card required
• No agents to install

Why CertBeacon

Your domain and certificate are the most valuable assets you own online. Never let them expire silently.

• SSL Certificate Expiry Monitoring: Automatically detect certificate validity and get early warnings before browser warnings and site outages.
• Domain Expiry Monitoring: Never lose your domain to a squatter — one forgotten renewal can cost you everything.
• Unexpected certificate alerts: We keep a record of every certificate covering your domain — and tell you when a new one appears that you did not expect.

Alerts where your team already works

Use whichever channel your team already watches — no dashboard to keep an eye on. CertBeacon comes to you before a certificate expires.

Email, Slack, Discord, ntfy and generic webhooks (which also covers DingTalk and Feishu). Paid plans can enable several channels at once for the same monitor.

What changes with CertBeacon

Same domains, same renewals — a very different experience.

• Renewal day — Alerts at 30 / 14 / 7 / 3 / 1 days, plus a 6-hour last-chance warning
• When something slips — You know first: Email, Slack, Discord, ntfy & Webhook
• Staying covered — Dual-engine checks: real TLS handshake + Certificate Transparency logs, automatic

Free plan for personal projects, forever — commercial use starts at Pro.

Set up in 3 minutes

From signup to your first alert, three steps.

• Create an account: Sign up with your email, no credit card needed
• Add a domain: Enter the domain to monitor, checks start instantly
• Get alerted: Automatic multi-channel notifications before expiry

Compare every plan

The complete difference between Free, Pro and Max — with nothing hidden in a footnote.

• Free — $0: 3 domains · checks every 24h · 30-day history
• Pro — $5/mo or $50/yr: 20 domains · checks every 6h · 90-day history
• Max — $15/mo or $150/yr: 80 domains · checks every 1h · 365-day history

3 domains free forever. Cancel auto-renew anytime — access lasts to the end of the paid period.

Frequently asked questions

How often are my domains checked?

Every 24 hours on Free, every 6 hours on Pro, and every hour on Max. Each pass re-reads certificate data from public Certificate Transparency logs and registration data from RDAP, and performs a real TLS handshake where supported.

Where does the expiry data come from?

Certificates come from public Certificate Transparency logs (crt.sh) and are verified with a real TLS handshake. Domain registration data comes from RDAP, the official successor to WHOIS. No guessing, no scraping of your site.

Which notification channels are supported?

Email, Slack, Discord, ntfy and generic webhooks (which also covers DingTalk and Feishu). Paid plans can enable several channels at once for the same monitor.

Is my data safe?

CertBeacon only reads publicly available certificate and registration data. We never need access to your servers, credentials or private keys — there is simply nothing sensitive for us to hold.

Try the free domain checker

Enter any domain to see its certificate and registration status — no signup needed.

Why we built CertBeacon

CertBeacon started as a tool we needed ourselves. A domain and its certificate are the two lifelines of any website — and both fail silently: nothing warns you that a certificate is 7 days from expiry.

Every check runs against public data — Certificate Transparency logs, RDAP records, verified with real TLS handshakes. There is nothing to install, and we never touch your servers or your keys.

All prices in USD, global sales tax handled by Creem as Merchant of Record.