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Synapse
Website monitoring that tells you why, not just when
Synapse watches your sites, APIs, DNS, and certificates, and when something breaks it finds the root cause across DNS, TCP, TLS, and the app layer, verified from multiple regions. Plus 30 free network and security tools, no signup required.
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.
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About Synapse on Product Hunt
“Website monitoring that tells you why, not just when”
Synapse was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #106 on the daily leaderboard. Synapse watches your sites, APIs, DNS, and certificates, and when something breaks it finds the root cause across DNS, TCP, TLS, and the app layer, verified from multiple regions. Plus 30 free network and security tools, no signup required.
Synapse was featured in Analytics (173.2k followers), SaaS (43.6k followers) and Developer Tools (517.5k followers) on Product Hunt. Together, these topics include over 148k products, making this a competitive space to launch in.
Who hunted Synapse?
Synapse was hunted by John P.. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Synapse stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
John P.