Both are hosted services that watch SSL/TLS certificates and domain registrations and email before they expire.
| CertAvert | WatchMySSL | |
|---|---|---|
| Main product | Certificate and domain monitor | Certificate and domain monitor |
| How it runs | Hosted, nothing to install | Hosted |
| Free | 15 domains | 2 domains, checked weekly |
| Paid plans | Starter 25, $50 a year; Plus 50, $100 a year; Pro 100, $150 a year (domains) | Pro 20, $50 a year; Agency 200, $150 (or $5 and $15 a month); Enterprise on request |
| Billing | Yearly | Monthly or yearly |
| Users per account | 1 | Not found |
| How often it checks | Twice a day | Weekly (Free), daily (Pro), hourly (Agency) |
| Expiry alert days | 30 and on expiry (Free); 30, 14, 7 and on expiry (Starter); your own days (Plus, Pro) | 45, 30, 14, 7, 3 and 1 |
| Short-lived certificates | Alerts at a quarter of the lifetime (under 80 days) | Not found |
| Ports other than 443 | Any port | Not found |
| Untrusted certificate or wrong name | Shown with the reason; emailed on paid plans | Not found |
| Chain check (missing intermediates) | Yes | Not found |
| Revocation check | Yes OCSP or CRL | Not found |
| Renewal window (ARI) | Yes | Not found |
| Post-quantum key exchange | Yes | Not found |
| Certificate change alerts | Shown on every plan; emailed on paid plans | Not found |
| Certificate Transparency logs | Lists other names under your domains; no alert for new ones | Not found |
| Domain name expiry | Registration dates on every plan; reminder emails on paid plans | Registration dates tracked |
| Alert channels | Email, Slack, Discord, Teams | Email, Slack |
| API | No | Not found |
| Status pages | No | Not found |
| Internal certificates | No the free certavert-scan runs on your own network | Not found |
| Audit report | Pro (PDF and CSV, checked at /verify) | A regular list of certificate and domain dates |
"Not found": we couldn't find it on WatchMySSL's pages, which doesn't mean it isn't there. WatchMySSL is a trademark of its owner; CertAvert isn't affiliated with it.
WatchMySSL fits better if you want many domains for little money: 200 for $150 a year, checked hourly. CertAvert fits better for 15 domains free, the chain, revocation and renewal window checks, and Discord or Teams alerts.
Sources: watchmyssl.com, watchmyssl.com/pricing
We check each product's own pages and do our best to keep this right, but mistakes are possible and products change. Something wrong or out of date? Write to support@certavert.com.