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Find out the technology behind websites

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, BuiltWith seems to be a lot more popular than Cert Decoder. While we know about 162 links to BuiltWith, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | builtwith.com | certdecoder.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Australia | — |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of BuiltWith yet.
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.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
How to Find Competitors Customers | BuiltWith Review | Kas Andz
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing BuiltWith 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 BuiltWith 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.


A great tool to help you discover the technology being used by a variety of websites. I was impressed that upon signing up that I had full access to a free list of leads.
Sometimes, BuiltWith may not fit your specific business needs. If so, we’ve compiled our list of best BuiltWith alternatives you may want to consider for your profiling.
BuiltWith is a truly comprehensive tool that will mine a ton of information from anyone’s site and serve it to you in a manner you will be able to crunch and use it. You might take your time since it is a lot of...
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.


Evan You, creator of Vue.js, is a prime example. Vivek Nair, Co-Founder of BotGauge, notes that You “created something that addresses real developer needs with clean logic and thoughtful design.” Vue.js powers over 1.5 million websites... - Source: dev.to / over 1 year ago
There exist websites like https://builtwith.com so answer to your question is yes. - Source: Hacker News / over 1 year ago
BuiltWith says the web client is NextJS which is interesting as ChatGPT made a big switch away to Remix IIRC. https://builtwith.com/?https%3a%2f%2fclaude.ai%2fnew. - Source: Hacker News / almost 2 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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