Track unlimited domains and get certificate expiry alerts delivered where your team already works: Telegram, Microsoft Teams, PagerDuty or anything using webhook integrations. Replaces Let's Encrypt's discontinued expiration emails with custom day windows for any certificate authority. 100% free, no credit card.
Pick your delivery channel — Telegram for instant phone alerts, Microsoft Teams for shared inboxes, PagerDuty for on-call, web dashboard for side-by-side management. Use one or stack them.
No credit card • Instant setup • Sign in with Telegram or email magic-link
Real-time SSL Verification Telegram + Teams + PagerDuty Unlimited Domains Completely Free
Critical Change Alert
Let's Encrypt Stopped Sending Expiration Notification Emails
As of June 4, 2025, Let's Encrypt ended their expiration notification service that millions of websites relied on. If you were depending on their email alerts, you're now flying blind when certificates are about to expire.
⚠️ What This Means:
- • No more email reminders from Let's Encrypt
- • Certificates can expire without warning
- • Automatic renewal failures go unnoticed
- • Website outages become more likely
✅ Certimon Fills the Gap:
- • Real-time Telegram notifications
- • Custom reminder periods (30, 7, 1 days)
- • Works with ALL certificate providers
- • 100% free, unlimited domains
Plus: Certificate validity periods are getting shorter too! By 2029, SSL certificates will only last 47 days, making monitoring even more critical.
Without Proper Monitoring, SSL Expiry Is More Dangerous Than Ever
With Let's Encrypt no longer sending email alerts and certificate lifespans getting shorter, the risk of unexpected SSL expiration has never been higher.
💔
Website Downtime
Expired certificates cause service outages and lost revenue. Users see security warnings.
📉
SEO Impact
Search engines penalize sites with SSL issues, affecting your rankings and visibility.
🚨
Security Breach Risk
Unencrypted connections expose sensitive data to potential interception.
New
Send SSL expiry alerts where your team already works
Certimon now ships beyond Telegram — fan out the same expiry event to a Microsoft Teams channel and to PagerDuty for on-call escalation, all from one alerting rule.
Wiring expiry events into your own pipeline? See the SSL certificate monitoring API page for webhook payloads and the planned REST endpoint shape.
Why Choose Certimon?
The most flexible free SSL monitoring service — fan out the same expiry event to Telegram, Microsoft Teams, PagerDuty and the web dashboard
Instant SSL Verification
Get detailed certificate information in seconds. Check issuer, expiry date, signature algorithm, and more.
/check example.com
Smart Reminders
Set custom reminder periods. Get notified 30, 7, or any number of days before expiry.
/remind example.com 30
Telegram Integration
Receive real-time notifications directly in Telegram. Check certificates on-the-go from anywhere.
Real-time alerts 📱
Visual Status Tracking
Monitor all your domains with color-coded status indicators and detailed expiry tracking.
/domains
Smart Error Diagnostics
Get specific diagnostics for SSL issues: expired certs, hostname mismatches, self-signed certificates.
Detailed error analysis
Automatic Monitoring
24/7 hourly checks ensure you never miss an expiry. Set it and forget it.
Hourly automated scans
Get Started in 30 Seconds
Sign up with Telegram or email, then add your first domain in a few seconds.
2
Add Your Domains
Use /remind domain.com 30 to set up monitoring and reminders.
3
Stay Protected
Receive automatic notifications before your certificates expire.
Simple Commands, Powerful Results
🔍 Check SSL Certificate:
/check google.com
🔔 Set Reminder:
/remind example.com 30
📋 List All Reminders:
/list
🌐 View All Domains:
/domains
❌ Remove Reminder:
/delete example.com 30
Why Certimon Beats the Competition
👈 Scroll horizontally to see full comparison
| Certimon | Other Services | |
|---|---|---|
| Price | 100% Free | per domain pricing |
| Let's Encrypt Alerts | ✅ Replaced | ❌ Ended June 2025 |
| Domain Limit | Unlimited | Limited by plan |
| Notifications | Real-time Telegram | Email only |
| Mobile Access | Native via Telegram | Web dashboard only |
| Setup Time | 30 seconds | Account setup required |
| SSL Details | Comprehensive | Basic info only |
Lightweight SSL Monitoring Alternatives
Already comparing enterprise tools? Certimon is a focused, free option when you mainly need certificate expiry checks and Telegram alerts for small projects.
Perfect for Every Professional
👨💻
Developers
"Monitor multiple client sites and personal projects. Get instant alerts when certificates need renewal."
🏢
System Administrators
"Keep track of dozens of domains across different environments. Never let a production cert expire again."
🚀
Startups & Small Teams
"Free monitoring that scales with us. No budget concerns, just reliable SSL protection for all our domains."
Trust & Privacy
Certimon is built to monitor public TLS endpoints, not to collect personal data. Here is exactly what is stored — and what is not.
What we store
- • Your Telegram chat ID (so the bot knows where to send reminders)
- • Domains you have asked us to monitor
- • Reminder windows you set (e.g. 30 / 7 / 1 days)
- • Latest certificate expiry date and last-check timestamp per domain
- • A short audit log of commands you ran (for diagnosing issues)
What we never store
- • Private keys or certificate file contents
- • Your phone number
- • Payment details (Certimon is free, there are no payments)
- • Website traffic, request bodies, or page contents
- • Telegram messages other than the commands you send the bot
Public TLS only
We connect to your domain on port 443 the same way any browser would, and read the public certificate it serves.
Telegram-native identity
No passwords. The web dashboard uses Telegram's official Login Widget and verifies the signed payload using our bot secret.
You can delete anytime
Send /delete example.com to drop a reminder, or stop the bot in Telegram to disable notifications. No support ticket required.
Frequently Asked Questions
Quick answers about Certimon, Telegram alerts, and SSL monitoring.
Is Certimon really free?
Yes. Certimon is 100% free with unlimited domains and no registration. There are no paid plans, ads, or hidden limits.
Why does Certimon exist now that Let's Encrypt stopped expiration emails?
Let's Encrypt ended their expiration notification email service on June 4, 2025. Certimon replaces those alerts by sending real-time SSL expiry notifications via a Telegram bot for any certificate authority, not just Let's Encrypt.
How do I start monitoring an SSL certificate?
Open @CertimonBot in Telegram, tap Start, and send /remind example.com 30 to get a reminder 30 days before that certificate expires. No account or credit card is required.
Which certificate authorities does Certimon support?
All of them. Certimon checks the live TLS certificate served by the domain over HTTPS, so it works with Let's Encrypt, ZeroSSL, Cloudflare, DigiCert, GoDaddy, Sectigo, internal CAs, or any other issuer.
How often does Certimon check my domains?
Domains you have set reminders for are re-checked automatically on an hourly schedule, and you can run /check anytime for an on-demand verification.
Do I need to install anything?
No. Certimon is a hosted SaaS — pick a delivery channel (Telegram, Microsoft Teams, PagerDuty) and optionally use the web dashboard at app.certimon.com. There is nothing to install on your servers.
How many domains can I monitor — is there a usage limit?
Unlimited. There is no per-domain pricing, no per-account cap, no trial period and no premium tier. Add as many domains as you need with /remind, and run /check on demand.
When will Certimon send me a reminder?
You choose the reminder window. /remind example.com 30 alerts you 30 days before expiry; you can stack multiple windows like 30, 7 and 1 days. Certimon re-checks subscribed domains hourly and pushes a Telegram message as soon as a configured threshold is crossed.
What data does Certimon store about me and my domains?
Only what is needed to deliver reminders: your Telegram chat ID when you use Telegram, your email address when you use email magic-link login, the domains you monitor, your reminder windows, and the latest certificate expiry / last-check timestamp per domain. Certimon never stores private keys, certificate contents, your phone number, or any payment information. See the Trust & Privacy section for the full list.
Do I have to use Telegram, or can I use the web dashboard only?
Not necessarily — the dashboard at app.certimon.com supports both Telegram login and a passwordless email magic-link. Telegram is only required if you want certificate alerts delivered to a Telegram chat (alternative channels include Microsoft Teams and PagerDuty).
How does login to the web dashboard work?
The dashboard supports two passwordless sign-in methods: Telegram's official Login Widget (tap Log in with Telegram, confirm in the app, Certimon verifies the signed payload with its bot secret) and an email magic-link sent to your inbox. There is no password to remember and no separate signup form.
Don't Wait for the Next SSL Disaster
With Let's Encrypt email alerts gone and certificates getting shorter lifespans, you need reliable monitoring more than ever. Join thousands who've already made the switch.
✓ Sign up with Telegram or email
✓ Start monitoring in 30 seconds
✓ 100% free forever