
Thunderbird
Microsoft Outlook
Airmail
Mailbird
eM Client
Postbox
Geary
Mailspring is a mail client for Mac, Windows and Linux.

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, Mailspring seems to be a lot more popular than Cert Decoder. While we know about 25 links to Mailspring, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | getmailspring.com | certdecoder.com |
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| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Mailspring 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
Mailspring is recommended for users who need a centralized hub for managing multiple email accounts. It is particularly well-suited for professionals who benefit from features like read receipts and link tracking, as well as those looking for a highly customizable email experience.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Installation and Configuration Free Email Client Software Mailspring
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Mailspring 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 Mailspring 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.


Mailspring offers activity tracking, meaning you get notified as soon as contacts read your email messages, and link tracking, so you can see who’s tracking your links.
Mailspring detects the language you are using and automatically spellchecks in that language.
Mailspring supports multiple accounts, read receipts, translations, undo send, and other popular email client features.
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 love Mailspring, it's modern and open source: https://getmailspring.com/ The UI uses Electron, but the actual sync engine is in C++, so it's pretty fast. - Source: Hacker News / over 3 years ago
The only app I’m aware of which translates emails is this; https://getmailspring.com. Source: over 3 years ago
Mailspring is quite nice. It also has a paid version and is actively updated so I think it's likely to stick around for awhile. 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 Mailspring and Cert Decoder, you can also consider the following products.

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Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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Airmail is a lightweight and lightning fast mail client for Mac.
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Mailbird is the best email client for Windows 7, 8 and 10
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eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
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The Power Email App for busy professionals, like you.
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