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Single-user mockup / wireframing / diagramming tool

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, Pencil Project seems to be a lot more popular than Cert Decoder. While we know about 11 links to Pencil Project, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | pencil.evolus.vn | certdecoder.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Vietnam | — |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Pencil Project 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
This tool is recommended for designers, project managers, and developers who need a simple yet effective solution for GUI prototyping and wireframe creation. It is also suitable for smaller teams or individuals with limited budgets who are looking for a no-cost alternative to more complex and expensive design software.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Pencil Project | Free UI Mockup Design Software
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 Pencil Project 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 Pencil Project 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.


Pencil Project is one of the best Visio alternatives which is open-source GUI prototyping software suitable for developers to create mockups, flow charts, floor designs, etc. It has a rich set of shapes and designed...
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 am a software developer, so doing UX is never my strength. From time to time though, I would resort to using the open source tool Pencil (https://pencil.evolus.vn/) to get a low fidelity mock-up. Lately I've been encountering bugs... - Source: Hacker News / over 3 years ago
Thanks for your replies. I checked some of them out, but I found one on my own that fits me perfectly: Pencil. Source: over 3 years ago
I wouldn't use text to illustrate a GUI. We use Pencil with the crayon-styled stencils to make quick mockups. The crayon styling makes it clear that they're just mockups so people don't poke at the style aspects of the design. We've... Source: about 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 Pencil Project and Cert Decoder, you can also consider the following products.



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LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
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A macOS/iOS apps to treat ideas as links of concepts.
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VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
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