
Air Display
iDisplay
spacedesk
Luna Display
Astropad
Mountie
Splashtop Wired XDisplay
With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.

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, Duet Display 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 | duetdisplay.com | certdecoder.com |
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| Listed in |
In their own words, as submitted to SaaSHub.


No description of Duet Display 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
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Duet Display 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 Duet Display 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.


Duet Display vs SpaceDesk: While some users do claim that SpaceDesk is not as responsive as Duet Display, the overall experience is satisfactory. It’s interesting that splash top is available on both Mac and windows...
It is a well-known software operating since the time of SpaceDesk. Duet Display has advanced features that make it a perfect alternative for SpaceDesk. Previously the software was only compatible with iPads and...
For quite some time now, Duet Display has been helping old iPads work as MacBook displays that are fast too. It’s only recently that they have been focusing on Windows and they are emerging as a good alternative to...
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.


Third party app Duet (duetdisplay.com) allows vertical orientation. Source: over 3 years ago
The native Apple Sidecar monitor extension thing will only work within range of the host computer ("both devices must be within 10 meters (30 feet) of each other and have Bluetooth, Wi-Fi, and Handoff turned on "). There's third party... Source: over 3 years ago
Thanks to our friends at About Chromebooks, Penoval, the Crostini subreddit, Duet Display and MyScript for helping make this possible. Source: over 4 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 Duet Display and Cert Decoder, you can also consider the following products.

Air Display allows extra screens to extend the display size of a Mac desktop. The company behind the product is Avatron Software, which was founded in 2008. Read more about Air Display.
Compare Air Display to Duet Display or Cert Decoder:

iDisplay is an app that turns a mobile device into a secondary desktop monitor. The app currently supports iOS, Android, Windows and MacOS, and it lets users connect a desktop computer to a mobile device over WiFi. Read more about iDisplay.
Compare iDisplay to Duet Display or Cert Decoder:

spacedesk expands the Windows desktop computer screen to other computers over the local area...
Compare spacedesk to Duet Display or Cert Decoder:

Hardware that turns the iPad into a wireless second display
Compare Luna Display to Duet Display or Cert Decoder:

Astropad is a free form drawing tool designed from the ground up to take advantages of the features offered by an iPad.
Compare Astropad to Duet Display or Cert Decoder:

Mount a second screen (iPad/iPhone/tablet) to your MacBook
Compare Mountie to Duet Display or Cert Decoder: