
Mailtrap
MailHog
mailslurp
Mailosaur
Mailpit
FakeSMTP
Mailcatch.app
MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a...

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, MailCatcher seems to be a lot more popular than Cert Decoder. While we know about 14 links to MailCatcher, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | mailcatcher.me | certdecoder.com |
| Pricing | ||
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of MailCatcher 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.


No analysis of MailCatcher 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 MailCatcher 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 MailCatcher 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.


I use it for testing and local development. We list it in our docs under 'other services'[0], where it is called out for local development. Because it has an API[1] you can use it for integration testing as well. Because it runs in... - Source: Hacker News / almost 2 years ago
It is unacceptable to bring a risk of accidentally sending dummy emails to real customers. To test email notifications, I recommend using Mailtrap. Mailtrap is a dummy SMTP server for testing emails sent from development and staging... - Source: dev.to / over 2 years ago
If you want to test SMTP mail delivery, there's MailCatcher: https://mailcatcher.me/. - Source: Hacker News / almost 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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FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.
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