
Space Engine
Stellarium
Heavens Above
Universe Sandbox
Satscape
See A Satellite Tonight
ISS Detector
Real-time 3D visualization of space

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, Celestia seems to be a lot more popular than Cert Decoder. While we know about 29 links to Celestia, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | celestiaproject.space | certdecoder.com |
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| Platforms | — | |
| Company | 2001 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


The expandable free and open-source real-time space simulator that lets you explore our universe in three dimensions.
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 Celestia 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 Celestia 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.


Incredible work! My son really had a blast scrolling around and exploring last night. Did you take any inspiration from Celestia (https://celestiaproject.space)? It's been over 15 years since I last really used it (and starts with... - Source: Hacker News / over 1 year ago
An honorable mention: https://celestiaproject.space This but in 3D and adjustable for any date. - Source: Hacker News / about 2 years ago
Pretty much everything beyond our solar system is essentially fixed on a human timescale. Over 2000 years, a typical star will move about half a degree. That's the width of the moon in the sky. There are of course notable exceptions... - Source: Hacker News / about 2 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 Celestia and Cert Decoder, you can also consider the following products.

Space Engine is a realistic virtual Universe you can explore on your computer.
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Stellarium is a free open source planetarium for your computer.
Compare Stellarium to Celestia or Cert Decoder:
Website for tracking Satellites, Space ships and other space objects.
Compare Heavens Above to Celestia or Cert Decoder:

Universe Sandbox ² is a physics-based space simulator where you can simulate Events and even break physics and friction with certain features.
Compare Universe Sandbox to Celestia or Cert Decoder:

A satellite tracking program for Windows, Mac OS and Linux.
Compare Satscape to Celestia or Cert Decoder:

Free web app to explore satellite locations.
Compare See A Satellite Tonight to Celestia or Cert Decoder: