
KanbanMail
Postbox
Sortd
Superhuman
Drag for Gmail
HEY
Flow-e
Turn your inbox into a kanban board

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, Kanmail should be more popular than Cert Decoder. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | kanmail.io | certdecoder.com |
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| Company | 2020 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Kanmail turns your inbox into a kanban board. Drag emails between columns like To Do and Waiting, then clear them a column at a time. Works with any GMail/Outlook/IMAP account. Your mail never touches our servers. Open source. One-time purchase, no subscription.
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
An editorial look at what each product does well and who it suits.


No analysis of Kanmail 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 Kanmail and Cert Decoder.
Kanmail's answer
Kanmail transforms your email inbox into a kanban board, letting you drag and drop emails between columns to organize workflows visually. It combines all your email accounts (Gmail, Outlook, etc.) into one unified view while keeping your data private on your device. You pay once and own it forever with no subscriptions.
Kanmail's answer
Kanmail offers a visual kanban approach that helps you actually manage email as tasks rather than just reading messages in a list. Unlike competitors, it combines multiple accounts in custom workflow views while keeping all your data local and private. It's a one-time purchase with no subscription fees or cloud dependencies.
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.
Kanmail's answer
Kanmail's primary audience includes professionals who manage multiple email accounts and need to organize emails as actionable tasks, such as salespeople tracking leads, customer support teams managing tickets, and power users who want efficient, keyboard-driven workflows. It appeals to privacy-conscious users who prefer local data storage and those frustrated with subscription-based email clients.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
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.
Share your experience with using Kanmail 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’ve gone through this process for my email client Kanmail [1]. The third party audit is not required for email clients that run on end users computers and store credentials locally. By the looks of it Pegasus falls into this... - Source: Hacker News / over 4 years ago
I’m building a desktop email client [0] that has $45 lifetime licenses. Made to scratch my own itch I’ve been using it as my only client for 4 years now, barely makes any money though! [0] https://kanmail.io. - Source: Hacker News / over 4 years ago
I use pyinstaller for my Kanmail email client [1] and it’s fantastic, but at creating Mac app bundles or Windows exes. Tried making actual standalone binaries for another project and, as others have mentioned, they’re incredibly slow to... - Source: Hacker News / almost 5 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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