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GuardSSL - Open Source SSL Certificate Monitoring Tool with Status Page and Badge Embedding

  I built GuardSSL, a modern SSL certificate monitoring and checking
  tool focused on helping developers and ops teams avoid service
  disruptions caused by expired certificates.

  Key Features:
   -  Real-time certificate checking - Get detailed certificate info
     instantly (validity, issuer, protocol version, cipher suite)
   -  Security scoring system - Automatically assesses certificate
     security (A+ to F grade), detects weak encryption algorithms and
     insecure protocols
   -  Certificate chain visualization - Visual display of complete
     certificate chain with integrity verification
   -  Status monitoring page - Publicly accessible status page
     showing SSL status and 30-day historical trends for all domains
   -  Website badges - Support classic and circular SSL status
     badges that can be embedded on any website
   -  Multi-channel notifications - Supports 5 notification
     channels: Email, Slack, Discord, Telegram, Feishu
   -  History tracking - Saves all check records with filtering and
     export capabilities
   -  Multi-language support - Available in 6 languages (Chinese,
     English, Japanese, French, Spanish)

  Tech Stack:
   - Next.js 16 + TypeScript + Tailwind CSS v4
   - Drizzle ORM + PostgreSQL
   - Redis session cache (95%+ performance improvement)

  Feel free to try it out and share your feedback! Any questions or
  suggestions are welcome in the comments.