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FOFA
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Rapid7
Censys helps organizations, individuals, and researchers find and monitor every server on the Internet to reduce exposure and improve security.

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, Censys seems to be a lot more popular than Cert Decoder. While we know about 13 links to Censys, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | censys.com | certdecoder.com |
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In their own words, as submitted to SaaSHub.


Attack Surface Management (ASM) At Censys, we can see it all. Our world-leading attack surface management platform gives organizations a sixth sense — relentlessly monitoring assets, seeing the unseen, and proactively giving security teams an opportunity to solve issues before they have a chance...
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 Censys yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Attack Surface Management
No Cert Decoder videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Censys 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 Censys and Cert Decoder. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


You should be able to see scans from censys.io, and other. Source: about 3 years ago
Some tools to consider: Gitleaks - open-source secret scanner for git repositories, files, and directories. Retire.js - dependency check tool for client JS code. Censys - It’s a search engine that you can use, for example, to scan any... Source: over 3 years ago
You also have censys.io, but I do not have much experience with them. Source: 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
When comparing Censys and Cert Decoder, you can also consider the following products.

Shodan is the world's first search engine for Internet-connected devices.
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Criminal IP protects IT assets and businesses by analyzing all years of cyber threats and prediciting exploits. Criminal IP provides real-time intelligence to enhance cybersecurity competencies in all aspects.
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Visibility into the state of your IT infrastructure, enabling you to understand your risk potential, prevent breaches, and speed up software delivery.
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FOFA is a Search Engine for global cyberspace mapping. Through continuous active detection of global Internet assets, identifying most software and hardware network assets.
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Recorded Future provides organizations with real-time threat intelligence.
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