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Chat GPT detector. Humans Deserve the Truth.

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, GPTZero seems to be a lot more popular than Cert Decoder. While we know about 75 links to GPTZero, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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GPT
GPTZero
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| Website | gptzero.me | certdecoder.com |
| Pricing | — | |
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of GPTZero 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
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing GPTZero 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 GPTZero 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.

GPTZero is inherently cautious, which is by far its greatest strength. It uses sophisticated linguistic metrics like “perplexity” (how complex and unpredictable the text is) and “burstiness” (the variation in sentence...
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.

AI-likeness is the target, and it's the one judge that has to live in code, because it isn't an LLM. You score the reply with GPTZero, an AI detector. The score is 1 - P(human): near 0 when GPTZero reads the reply as human, which is your... - Source: dev.to / about 1 month ago
Obvious AI tells abound in the text and in the GitHub repo, which is clearly 100% vibe coded. If you cannot see this, then I don't know what to tell you. Actually, I do. For the text of the paper, paste any section after the... - Source: Hacker News / 7 months ago
GPTZero - Commercial AI detection service with free tier. - Source: dev.to / 9 months 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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