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We monitor the software that makes your customers happy.

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?
Based on our record, AppSignal should be more popular than Cert Decoder. It has been mentioned 8 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | appsignal.com | certdecoder.com |
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| Company | Startup from the Netherlands | — |
| Listed in |
In their own words, as submitted to SaaSHub.


AppSignal gives you error tracking, performance monitoring, host metrics and anomaly detection in one great interface. By developers for developers.
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
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of AppSignal yet.
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing AppSignal and Cert Decoder.
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
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
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.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Share your experience with using AppSignal 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.


AppSignal had the easiest installation of all the services we tried. Once you sign up, it immediately walks you through onboarding. First you add the :appsignal_phoenix hex package. Then you run mix appsignal.install...
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.


It’s pretty obvious, why we should monitor the application’s performance. Application Performance Monitoring (APM) tools are helping us with that. I prefer using New Relic and it has no significant alternatives for me. However, you can... - Source: dev.to / over 2 years ago
Import { test, expect } from "@playwright/test"; // define a test task called "has expected title" Test("has expected title", async ({ page }) => { // visit the AppSignal home page in the browser await... - Source: dev.to / about 3 years ago
Now comes the monitoring part, woo! Monitoring performance indicators in Node.js is very simple. You can opt-in to use the simple internal tools that Node provides, or you can use a fully-fledged tool like AppSignal. - Source: dev.to / over 3 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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