No moat. Still in business.
Software directory for those who don’t want to rebuild, own the updates, the bugs, the support.
- haveibeenexpired
Watches your SSL certificates and sends alerts well before they expire, with automatic host discovery.
Since 2022
Free plan · Uptime and monitoring · Developers
- CertObserver
Finds hosts under your domains from certificate logs, watches their SSL certificates and warns you before they expire.
Since 2026
Free trial · Uptime and monitoring · Developers
- Domain Locker
Keeps every domain you own in one dashboard and alerts you to expiry dates, DNS and SSL changes.
Free plan · Uptime and monitoring
- CertPost
Reads the SSL certificate each of your hosts serves and emails warnings before it expires or breaks, for teams and agencies.
Free plan · Uptime and monitoring · Agencies
- Certimon
Tracks SSL certificates on any number of domains and warns you before they expire via Telegram, Teams, PagerDuty or webhooks.
Since 2025
Free · Uptime and monitoring