Dev tools · alternatives · 2026

24 alternatives to CertSonar

SSL, domain & DNS monitoring get alerted before things break

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier.

1
Monitorly▲76
Get real-time alerts for your SSL expiry
2022 · its alternatives →
2
SSL Alerts▲157
Free service to send SSL certificate expiration alerts
2018 · alerts.httpscop.com · its alternatives →
3
Notify.domainsfree tier, from $2/mo▲322
Know the moment a domain opportunity appears
Aug 2026 · notify.domains · its alternatives →
4
Certly▲7
Know before your SSL, domain, or DNS breaks
Jul 2026 · certly.dev · its alternatives →
5
haveibeenexpired▲68
No more expired SSL certificates
2021 · haveibeenexpired.com · its alternatives →
6
Kit.domains▲198
Hello Hacker News community, We are excited to announce the launch of KIT.DOMAINS, our new tool designed to simplify the management and monitoring of domains. KIT DOMAINS is a convenient and reliable solution for tracking the status of your domains and SSL certificates. With KIT DOMAINS, you will receive timely notifications about expirations and emerging issues, ensuring your sites remain operational and secure. Key features: - Expiration Tracking: Monitor the expiration dates of your domains to prevent accidental lapses. - SSL Certificate Monitoring: Keep your SSL certificates up-to-date…
2024 · kit.domains · its alternatives →
7
Never have an SSL certificate expire again▲40
Automated SSL certificate monitoring with expiration alerts, Certificate Transparency discovery, and Slack/Discord/Teams notifications. Prevent downtime with continuous monitoring.
2022 · haveibeenexpired.com · its alternatives →
8
Momento▲140
A powerful platform to help you monitor your domains
2020 · domexus.com · its alternatives →
9
CertNotifier▲15
Get notified before your certificates expire
2025 · certnotifier.com · its alternatives →
10
Observe Domains▲78
Monitor domain settings, SSL certificates, expiration dates
2022 · observe.domains · its alternatives →
11
CertWarden: SSL Expiry Tracker▲10
Track SSL expiry before it breaks your site
Feb 2026 · apps.apple.com · its alternatives →
12
SSL Monitoring Solution▲6
Monitor SSL certs and avoid unexpected downtime
2025 · its alternatives →
13
SSL Remind▲63
Never forget to renew your SSL certificates
2020 · sslremind.com · its alternatives →
14
CertCobra▲12
Get Alerted When SSL Certificates Are About To Expire
2025 · its alternatives →
15
CertFleet▲1
SSL + uptime monitoring without the observability bill
Aug 2026 · its alternatives →
16
Certificate Transparency Log Monitor▲53
2016 · sslmate.com · its alternatives →
17
SSLreminder▲78
Keep the business running, get reminded to extend your SSL
2021 · sslreminder.pro · its alternatives →
18CS
CertStream – See SSL certs as they're issued in real time▲142
2017 · certstream.calidog.io · its alternatives →
19
CertChecker▲1
Never find out an SSL cert expires too late
Aug 2026 · certchecker.dev · its alternatives →
20
ExpiryPing SSL Certificate Monitoring▲2
SSL & domain expiry alerts for agencies. 5-min setup.
Jun 2026 · expiryping.dev · its alternatives →
21
Free Certificate Monitoring via RSS▲120
2024 · raphting.dev · its alternatives →
22
24/7 Uptime, SSL & SEO Alerts▲8
Website monitoring & health checks
2025 · its alternatives →
23
Watch My SSL▲6
Monitoring SSL Certificates to Prevent Expiry
2024 · watchmyssl.com · its alternatives →
24
CertPost▲3
SL monitoring that checks the certificate your server serves
Aug 2026 · certpost.ai · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →