Hi Product Hunt 👋 Every engineer knows the moment: something breaks, and you have no idea if it's your app, your DNS, your cert, or the internet just having a bad day. Synapse exists to answer that in one look, then watch it for you so you find out before your users do. At 3am, that's the difference between fixing an issue in five minutes and spending an hour chasing DNS, TLS, certificates, firewalls, or the application. I built Synapse around one simple idea: the diagnosis should be part of the alert. Every monitor runs root cause analysis when it detects a failure. Instead of "Website Down," you know whether the problem is DNS resolution, TCP connectivity, TLS negotiation, certificate expiration, redirects, or the application itself. Synapse also verifies failures from multiple regions before alerting, which helps eliminate false positives. Alerts land in Slack, Discord, PagerDuty, email, or a webhook. Even if you never buy Synapse, I wanted to build tools I'd actually use every day. That's why every diagnostic tool is completely free, no account, no signup: - SSL checker: https://synapse.mdlc.ai/tools/ss... - DMARC checker: https://synapse.mdlc.ai/tools/dm... - DNS propagation: https://synapse.mdlc.ai/tools/dn... - SPF, DKIM, HTTP, and more, 30 tools total: https://synapse.mdlc.ai/tools I also built something I wish existed years ago: Internet Weather. It's a live health map showing whether the wider internet is having problems across DNS, TLS, cloud providers, and connectivity. Before diving into your own infrastructure, you can answer one question: is it my service, or is the internet having a bad day? https://synapse.mdlc.ai/weather If you do want the monitoring: - $29/month includes 50 monitors - Every monitor type included, no feature tiers - Add 25 more monitors for $25 P.S. Synapse itself was built with MDLC, my structured workflow for shipping production apps with Claude Code. If anyone is curious how it was made: https://mdlc.ai I'd genuinely love your feedback, especially on the free tools and what's missing. Thanks for taking a look.

Synapse

Website monitoring that tells you why, not just when

Website monitoring that tells you why, not just when