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Web-based IMAP email client

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, Roundcube seems to be a lot more popular than Cert Decoder. While we know about 17 links to Roundcube, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | roundcube.net | certdecoder.com |
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| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Roundcube 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
Roundcube is recommended for small to medium-sized organizations, educational institutions, and individuals looking for a versatile and user-friendly webmail client. It is especially suitable for those who require an open-source solution that can be tailored to specific needs through plugins and custom development.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Siteground Webmail Review: Login Access Email Account and Roundcube Overview
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Roundcube 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 Roundcube 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.


RoundCube features LDAP connection, address book management, IDNA and SMTPUTF8 support, share/ global IMAP folders, import/ export options, threaded message listing and more.
Roundcube also offers many of the functions you can find on iRedMail including message searching, folder manipulation, multiple sender identities, support for the external SMTP server, import/export, and unlimited...
RoundCube RoundCube Webmail is a PHP webmail client that will work with a MySQL or Postgres database. One appealing feature it brings is the ability to skin the application-style user interface using XHTML and CSS 2....
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.


I’m also a happy Migadu customer, and I have never had to interact with their support. I use it for most of my domains, except for a few that are work-related. For Webmail, I have been meaning to try https://roundcube.net You can try it... - Source: Hacker News / about 1 year ago
I have tried several, and liked none of them. I'm currently on Geary, but it's lacking in functionality, and it has things like search results being a bit different upon each of my searches. Starred messages cannot be shown on top.... - Source: Hacker News / over 2 years ago
You could try a standalone email client like Mozilla's Thunderbird, or if you're experienced running a web server, you could check out something like Roundcube. I suppose you could even run it locally if you're familiar with PHP and/or... 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 Roundcube and Cert Decoder, you can also consider the following products.


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SquirrelMail is a standards-based webmail package written in PHP.
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