Free · Unlimited domains · Telegram reminders
Free SSL Certificate Monitoring
Watch every certificate you care about — for free, with no per-domain fee, no signup, and reminders delivered straight to Telegram before anything turns red.
Who this is for
Free SSL certificate monitoring is a useful safety net any time renewal automation can silently fail — and that is essentially every production system. Certimon is built specifically for the people who do not want to buy a per-domain monitor or stand up a full observability stack just to get an expiry warning:
- Indie developers running a handful of side projects who need a reliable SSL expiry reminder without monthly fees.
- Freelancers and agencies juggling dozens of small client sites where each domain is too low-revenue to justify a paid per-domain monitor.
- Homelab and self-hosting operators watching personal services, internal tools, and family hosting.
- Small startups that already use Telegram for ops alerts and want one more guardrail before adding observability spend.
- System administrators who want a no-account-required backup channel separate from their primary monitoring.
What is free — and what the limits are
Plain, accurate scope. No upsell page hiding behind a paywall.
Free, no asterisks
- • Unlimited domains tracked per Telegram account.
- • Unlimited reminder schedules per domain.
- • Configurable reminder windows (for example 30, 7, 1 days).
- • On-demand
/check domain.comSSL inspection. - • Works with certificates from any CA reachable over the public internet.
- • Optional web dashboard at app.certimon.com.
Honest limits
- • Best-effort operation — no formal uptime SLA.
- • Public-internet TLS handshake only; private hostnames must be reachable.
- • Telegram delivery only (no email/SMS/PagerDuty integrations on the free service).
- • Operated by a small team, so abusive workloads may be rate limited.
- • Not a replacement for an SLO-grade monitor on revenue-critical systems — pair it with one.
Setup: free SSL certificate monitoring in five minutes
All steps happen inside Telegram. No signup form, no email confirmation, no card on file.
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1
Open the Certimon Telegram bot
In Telegram open @CertimonBot and press Start. The bot replies with the command list immediately — there is no signup, email confirmation, or credit-card step.
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2
Add each domain with a 30-day reminder
For every domain you want monitored, send a
/remindcommand. Certimon adds the domain, performs an immediate TLS handshake, and schedules the reminder window in one step:/remind example.com 30 /remind www.example.com 30 /remind api.example.com 30
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3
Layer additional reminder windows
A single reminder is fragile — phones get muted, messages scroll past. Layer extra reminders so the warning lands more than once:
/remind example.com 7 /remind example.com 1
A marketing site usually only needs 30 and 7; a checkout endpoint or login domain should also have 1.
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4
Verify the tracked list
Send
/domainsto see everything Certimon is watching. Send/check example.comat any time for an on-demand SSL handshake — useful right after deploying a new certificate.
Free vs paid per-domain SSL monitors
A fair comparison. Paid platforms exist for good reasons; this table is about when free is genuinely sufficient.
| Capability | Certimon (free) | Typical paid per-domain monitor |
|---|---|---|
| Price | Free | Per-domain fee or tiered plan |
| Domain limit | Unlimited | Capped by plan |
| Signup | None — just Telegram | Account + payment method |
| Detection method | Live TLS handshake | Live TLS handshake |
| Reminder channel | Telegram | Email, Slack, PagerDuty, webhooks |
| SLA / SLO reporting | No formal SLA | Yes |
| Multi-user teams & RBAC | Per-account | Yes |
| Best fit | Indie, agencies, homelab, small teams | Enterprises with compliance & SLA needs |
Comparing a specific vendor? See the Datadog SSL monitoring alternative, SolarWinds alternative, and GoDaddy SSL price vs free SSL pages.
Why Telegram for SSL expiry reminders
Choosing the alert channel matters as much as the detection method.
Push to where you already work
Most operators already receive uptime, deploy, and CI notifications in Telegram. A certificate reminder in the same room is hard to miss; an email in a shared inbox is easy to lose.
No SMTP plumbing to fail
Expiration notification emails get caught in SPF/DKIM/DMARC tightening, spam filters, and unmanaged forwarding rules. Telegram delivery is end-to-end through one provider with a single failure mode.
No email address to retain
Setup uses your Telegram identity. There is no email address to verify, recycle, or accidentally point at a former employee.
Replacing Let's Encrypt's discontinued email alerts? Read the Let's Encrypt expiration email alternative & migration guide or the expiry.letsencrypt.org bot alternative.
FAQ — free SSL certificate monitoring
Is Certimon really free for SSL certificate monitoring?
Yes. The service is free for unlimited domains and unlimited reminders. There is no paid tier, no per-domain fee, and no card required to sign up.
How many domains can I monitor for free?
Unlimited. The service is designed for personal portfolios, agencies that manage many small client sites, and homelab operators with internal hostnames.
What does the free SSL expiry monitor actually do?
Certimon performs a real TLS handshake against each domain on a schedule, parses the live certificate, and sends a Telegram message when expiry is within the reminder window you set (for example 30, 7, or 1 day before expiry).
Why is the reminder delivered to Telegram instead of email?
Telegram is where many operators already receive alerts from uptime monitors, CI, and chatops bots. A reminder that lands in the same channel as your other incidents is much harder to miss than an email in a shared inbox, and there is no SMTP delivery chain to fail.
Does Certimon work with Let's Encrypt, Cloudflare, and other certificate authorities?
Yes. Certimon checks the live certificate served by your hostname, so it works with certificates from any CA — Let's Encrypt, ZeroSSL, Cloudflare, DigiCert, Sectigo, GoDaddy, internal corporate CAs, and more.
Are there any limits on the free SSL certificate monitoring?
The service runs on shared infrastructure with best-effort uptime — there is no formal SLA. There are no per-user domain caps. If you need a contractual SLA, dedicated infrastructure, or per-domain SLO reporting, an enterprise observability platform such as Datadog or SolarWinds is a better fit.
Is there a free SSL certificate expiry reminder for non-public hostnames?
Certimon connects from the public internet, so the hostname must be reachable from a public IP for the TLS handshake to succeed. For internal-only hostnames, either expose them on a VPN-restricted endpoint or use a self-hosted alternative — see open source SSL monitoring for a self-host walkthrough.
Related guides
Let's Encrypt expiration email alternative
Replace the discontinued Let's Encrypt expiration emails with a free Telegram reminder.
Check SSL certificate expiration date
Quick on-demand SSL check methods: openssl, browser, and Certimon.
Open source SSL monitoring
Self-host an SSL expiry monitor for internal or air-gapped hostnames.
GoDaddy SSL price vs free SSL
When paying for SSL still makes sense — and when a free certificate plus free monitoring covers everything.
Start free SSL certificate monitoring now
Five minutes of setup, free forever, Telegram reminders before any certificate goes red.
Start free monitoring