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KeyChest
SSL certificate inventory + expiry alerts — free up to 10 certs.
What it does well
- Free tier monitors up to 10 certificates and 10 domains with weekly scans.
- Automatically discovers certificates on subdomains, simplifying initial setup and inventory creation.
- Integrates with Slack and provides a REST API for custom alert workflows.
- Supports monitoring of internal servers and devices, not just public-facing websites.
Where it falls short
- Exclusively focused on certificate and domain expiry; no uptime or performance monitoring included.
- The user interface is functional but lacks the modern design of some competitors.
- Alerts are based on a fixed schedule (e.g., 30, 15, 7 days) with limited customization.
- Free plan only scans weekly, which may not be frequent enough for critical systems.
Alternatives to KeyChest
SSLPing
freemiumSSL certificate expiry monitor — alerts before your cert dies.
UptimeRobot
freemiumMost popular free uptime monitor — 50 free monitors at 5-min intervals.
StatusCake
freemiumLong-running freemium uptime tool — uptime + SSL + domain expiry in one dashboard.
Uptime Kuma
freeSelf-hosted open-source uptime monitor with status pages — Docker one-liner deploy.