
Auth0
Keycloak
Okta
LoginRadius
Amazon Cognito
Clerk Authentication
SuperTokens
FusionAuth is a CIAM platform that is 100% free for unlimited users.

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, FusionAuth seems to be a lot more popular than Cert Decoder. While we know about 31 links to FusionAuth, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | fusionauth.io | certdecoder.com |
| Pricing | ||
| Platforms | — | |
| Company | 2019 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


FusionAuth adds authentication, authorization, user management, reporting, analytics and much more in minutes not months.
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
FusionAuth is recommended for developers and organizations that require a highly customizable and feature-rich identity management solution. It’s particularly suitable for businesses with specific authentication needs, such as multi-tenant environments, custom user registration workflows, and advanced security features. It is ideal for medium to large enterprises and development teams comfortable with configuring and maintaining a flexible authentication platform.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
No Cert Decoder videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing FusionAuth 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 FusionAuth 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.


Like Auth0, FusionAuth is a powerful user management solution with a lot more to offer. Getting started and setting up FusionAuth takes no time because it is compatible with databases, such as Java and C#.
/ Digitalberry news / IAM: A comparison of open-source toolsIAM: A comparison of open-source toolsWhy use an Identity Provider (IdP)?Comparative study of Identity Providers (IdP)1. Our team’s first choice: Keycloak2....
One of the biggest differences between Auth0 and FusionAuth is cost. FusionAuth is free for unlimited users. No strings, gimmicks, or tricks. No cost increases when you hit a certain Monthly Active User threshold....
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.


Why does the https://fusionauth.io/ website suck then? Enough of these code is worthless propaganda articles. - Source: Hacker News / about 1 month ago
As someone who came from Auth0 and god-awful Amazon Cognito, we've been using FusionAuth for years. Their APIs and SDKs have been amazing to work with. https://fusionauth.io It does what Auth0 does but significantly more cheaper and you... - Source: Hacker News / about 2 years ago
FusionAuth is one of the most decorated and successful open-source IAM solutions. It has been downloaded by more than 10 million customers and hosts over 1 million digital identities. - Source: dev.to / over 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 FusionAuth and Cert Decoder, you can also consider the following products.

Auth0 is a program for people to get authentication and authorization services for their own business use.
Compare Auth0 to FusionAuth or Cert Decoder:

Open Source Identity and Access Management for modern Applications and Services.
Compare Keycloak to FusionAuth or Cert Decoder:

Enterprise-grade identity management for all your apps, users & devices
Compare Okta to FusionAuth or Cert Decoder:

Loginradius is a cloud-based customer identity and access management platform. LoginRadius empowers businesses to deliver a delightful customer experience without compromising security.
Compare LoginRadius to FusionAuth or Cert Decoder:

Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
Compare Amazon Cognito to FusionAuth or Cert Decoder:

Clerk is a complete suite of embeddable UIs, flexible APIs, and admin dashboards to authenticate and manage your users.
Compare Clerk Authentication to FusionAuth or Cert Decoder: