Certificate monitoring made simple

Q: How do I start monitoring an SSL certificate?

Open https://t.me/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.

Q: 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.

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.

Need to replace the Let's Encrypt email alerts? Read the full Let's Encrypt expiration email alternative & migration guide, or the expiry.letsencrypt.org bot alternative.

Protect Your Websites Now

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.

Microsoft Teams

NEW

Free Workflows webhook posts Adaptive Cards into any channel. Five-minute setup, no Office 365 Connector required.

Set up Teams alerts →

The original Certimon channel — push notifications straight to your on-call engineer's phone.

See Telegram setup →

PagerDuty

NEW

Route expiry crossings into PagerDuty Events API v2 so on-call rotations and escalation policies pick them up.

Wire up PagerDuty →

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

Open the dashboard and continue with Telegram or email magic-link.

Add Your Domains

Use /remind domain.com 30 to set up monitoring and reminders.

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

❓ Get Help:

/help

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.

Datadog SSL certificate monitoring alternative

Datadog SSL monitoring is a paid module bolted onto an observability platform. Certimon is a focused free SaaS for SSL expiry — delivered to Telegram, Teams, PagerDuty or a web dashboard — when you mainly need certificate alerts for small projects.

SolarWinds SSL certificate expiration monitor alternative

See how Certimon works as a simple SSL certificate expiration alert path for domains that do not need full network monitoring.

GoDaddy SSL certificate price vs free SSL

Do you actually need to pay for SSL? Side-by-side pricing for GoDaddy DV/Wildcard/OV/EV vs Let's Encrypt, Cloudflare and ZeroSSL — plus when each makes sense.

Free SSL certificate providers compared

Let's Encrypt vs ZeroSSL vs Buypass Go SSL vs Cloudflare Universal SSL — lifetimes, ACME, wildcard support, and how to monitor any of them for free.

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.

Start monitoring Start in Telegram

✓ Sign up with Telegram or email

✓ Start monitoring in 30 seconds

✓ 100% free forever