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Nomorobo VS Cert Decoder

Compare Nomorobo VS Cert Decoder and see what are their differences

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Nomorobo logo Nomorobo

Nomorobo blocks annoying robocalls, telemarketers, and phone scams.

Cert Decoder logo Cert Decoder

Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.
  • Nomorobo Landing page
    Landing page //
    2022-07-17
  • Cert Decoder
    Image date //
    2025-03-22

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.

Nomorobo features and specs

  • Call Blocking
    Nomorobo effectively blocks unwanted robocalls and telemarketers using a large database of known spam numbers, reducing nuisance calls.
  • Real-Time Protection
    The service offers real-time protection and updates its database frequently, ensuring it remains effective against emerging spam numbers.
  • Easy to Use
    Nomorobo is designed to be user-friendly with a straightforward setup process, making it accessible to non-technical users.
  • Compatibility
    Nomorobo is compatible with many major phone services and can be used on both landlines and mobile phones.
  • Free for VOIP Lines
    Nomorobo offers its call blocking service for free to Voice Over IP (VOIP) phone users.

Possible disadvantages of Nomorobo

  • Limited Free Mobile Version
    Nomorobo is not free for mobile phones and requires a subscription, which could be a drawback for some users.
  • Not 100% Effective
    While effective, no call blocking service, including Nomorobo, can block every single spam call, and some unwanted calls might still get through.
  • Potential for Blocking Wanted Calls
    There's a possibility that legitimate calls might be accidentally blocked if they are mistakenly identified as spam.
  • Dependence on Subscriber's Internet Connection
    Nomorobo's effectiveness on VOIP lines is dependent on the subscriber's internet connection, which might pose an issue if connectivity is poor.
  • Variable Carrier Support
    While it supports many carriers, there are still some that do not support integration with Nomorobo, limiting its usability for some users.

Cert Decoder features and specs

  • User-Friendly Interface
    Cert Decoder is designed with a simple and intuitive interface that makes it easy for users to navigate and use the tool without requiring extensive technical knowledge.
  • Comprehensive Analysis
    The tool provides detailed analyses of certificates, including information about validity, issuer, encryption algorithms, and more, helping users understand their security certificates thoroughly.
  • Free to Use
    Cert Decoder offers its services free of charge, making it accessible for individuals and organizations without budget constraints.
  • Quick Processing
    The tool processes certificate information rapidly, providing almost instant results for users, which is crucial for time-sensitive tasks.

Possible disadvantages of Cert Decoder

  • Limited Advanced Features
    Compared to some paid alternatives, Cert Decoder might lack advanced features that are necessary for more complex certificate management and diagnostics.
  • Reliance on Internet Access
    Users need an active internet connection to utilize the tool, which can be a limitation in areas with unreliable internet service.
  • Privacy Concerns
    While using an online service to decode certificates, there can always be privacy concerns regarding sensitive data being uploaded to a third-party server.
  • No Offline Mode
    Cert Decoder does not offer an offline mode, which could be a drawback for users who require functionality without constant internet availability.

Analysis of Cert Decoder

Overall verdict

  • Cert Decoder appears to be a free online tool for decoding and inspecting SSL/TLS certificates, CSRs, and related cryptographic data, making it useful for quick, no-install certificate analysis, though it should be used with awareness of general web tool privacy considerations when handling sensitive certificate data.

Why this product is good

  • Provides quick, browser-based decoding of certificates without needing to install software
  • Useful for troubleshooting SSL/TLS certificate issues on the fly
  • Simple interface aimed at both technical and semi-technical users
  • No cost to use for basic certificate decoding tasks

Recommended for

  • System administrators needing to quickly verify certificate details
  • Developers debugging SSL/TLS configuration issues
  • IT support staff troubleshooting website certificate errors
  • Students or professionals learning about certificate structure and encoding

Nomorobo videos

+ Add

Nomorobo - reviews! Is it worth it? Does this app actually block robocalls?

More videos:

Cert Decoder videos

No Cert Decoder videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Nomorobo and Cert Decoder)

Nomorobo

Cert Decoder

Caller ID
100 100%
Caller ID
0% 0
Decoding
0 0%
Decoding
100% 100
Call Management
100 100%
Call Management
0% 0
Monitoring Tools
0 0%
Monitoring Tools
100% 100

Questions & Answers

As answered by people managing Nomorobo and Cert Decoder.

What's the story behind your product?

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.

Which are the primary technologies used for building your product?

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

How would you describe the primary audience of your product?

Cert Decoder's answer:

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

Why should a person choose your product over its competitors?

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.

Who are some of the biggest customers of your product?

Cert Decoder's answer:

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

User comments

Share your experience with using Nomorobo and Cert Decoder. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, Nomorobo seems to be a lot more popular than Cert Decoder. While we know about 11 links to Nomorobo, we've tracked only 1 mention of Cert Decoder. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Nomorobo mentions (11)

  • Scam 888-902-2150
    Does Comcast support spam filtering, e.g. NoMoRobo or Stir/Shaken? I recently switched from AT&T digital phone to a VoIP provider, enabled these two features, and all sales/spam calls just magically vanished. Source: over 3 years ago
  • HELP - I get 10-20 calls/texts a day from small business loan sharks
    I have this installed on my home phone which has greatly reduced the number of calls I get https://nomorobo.com/. Source: over 3 years ago
  • Phone is getting bombarded with about 30 phone calls an hour this morning.
    Do you use nomorobo.com? Ww find it screens a good percentage of our junk calls. But not all. Source: over 3 years ago
  • meirl
    Perhaps the most life-improving thing ever done in my home is registering at nomorobo.com. Source: over 3 years ago
  • My landline number gets the same spam calls about 8 times a day, is there anyway I can block these numbers?
    See if nomorobo is compatible. It won't block the numbers but it will disconnect them within 2-3 rings. Source: almost 4 years ago
View more

Cert Decoder mentions (1)

  • Banana.dog back from the dead
    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

What are some alternatives?

When comparing Nomorobo and Cert Decoder, you can also consider the following products

Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.

Hiya - Know who's calling or texting and block spammers on Android

CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.

RoboKiller - A paid application for iOS and Android users which blocks and pranks spam callers, such as scammers.

NoPhoneSpam - Block calls from annoying or private numbers on your Android device. By bitfire.

Silence: Block Unknown Callers - Block unknown callers. Contribute to x13a/Silence development by creating an account on GitHub.

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