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SIGNL4 ensures every critical alert and incident triggers immediate action – anywhere. SIGNL4 provides a comprehensive set of features to ensure automated alerting and reliable human response. Anywhere. Anytime.

Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.

Which is more popular?
Cert Decoder might be a bit more popular than SIGNL4. We know about 1 link to it since March 2021 and only 1 link to SIGNL4.
Website, pricing, platforms and company facts side by side.
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| Website | signl4.com | certdecoder.com |
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| Company | Startup from Germany · 20 - 49 employees | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Modern monitoring and control systems can detect incidents quickly across infrastructure, cloud environments, security platforms, and IoT systems – but alerts alone do not guarantee that someone responds. Simple notifications sent via email, SMS, or chat are often missed, delayed, or ignored,...
Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of SIGNL4 yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
SIGNL4 - Mobile Alerting & Anywhere Incident Management
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing SIGNL4 and Cert Decoder.
SIGNL4's answer
Businesses of any size with critical infrastructure or processes that need to run 24/7.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
SIGNL4's answer
BASF, Mercedes Benz, Fellowes, Scania, Verdun Oil, Edeka, Unitil
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
SIGNL4's answer
If you are looking for a proven, modern and super-reliable mobile solution - SIGNL4 is the right choice.
Cert Decoder's answer:
Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.
SIGNL4's answer
SIGNL4 stands out as the ultimate solution for mobile alerting and team mobilization in the event of a critical incident, ensuring rapid response when it matters most. Unlike traditional notification systems, SIGNL4 offers automated, targeted, and persistent alerts that cut through the noise—reaching the right people at the right time via mobile push, SMS, and voice calls. With built-in alert filtering, duty scheduling, acknowledgment tracking, automated escalations, and seamless integrations with IT, IoT, and operational systems, SIGNL4 empowers teams to stay in control, minimize downtime, and enhance operational efficiency. Its intuitive interface, enterprise-grade security, and real-time collaboration features make it the go-to solution for businesses seeking reliable, fast, and actionable alerting and incident response wherever they are.
SIGNL4's answer
Founded in 1999, Derdack is a bootstrapped innovator in alert management, communication automation and incident management. SIGNL4 is our fast -growing SaaS product.
Cert Decoder's answer:
I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.
Cert Decoder's answer:
certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server
Share your experience with using SIGNL4 and Cert Decoder. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


💰 SIGNL4 is a plug-and-play cloud solution produced by Derdack. It automatically notifies teams on their mobile devices in case of critical events. The SIGNL4 node allows you to send and resolve alerts. For example,...
With this system we have very good mobile alerting with manager escalation, time scheduling and auto calling when analyst don't confirm alert.
I have been looking for an app like this for over 2 years! Finally, an emergency alert app that gives persistent notifications, and can work with iOS to even alert you when you have Do Not Disturb enabled. Since this...
We have no reviews of Cert Decoder yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


For the alerting part you might want to check out the app-based alerting service SIGNL4 which integrates with the mentioned tools:. Source: over 5 years ago
Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago
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