
Auth0
Keycloak
Next.js
Okta
AuthKit
Amazon Cognito
Kinde
Clerk is a complete suite of embeddable UIs, flexible APIs, and admin dashboards to authenticate and manage your users.

With Cozystack, you can transform your bunch of servers into an intelligent system with a simple REST API for spawning Kubernetes clusters, Database-as-a-Service, virtual machines, load balancers, HTTP caching services, and other services with ease.

Which is more popular?
Based on our record, Clerk Authentication seems to be more popular. It has been mentioned 47 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | clerk.com | cozystack.io |
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| Company | Startup from the United States · 50 - 99 employees · 2019 | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Clerk Authentication yet.
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.


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Recommendations tracked on public social media and blogs since March 2021.


I work at malibou, an HRIS that also runs payroll for its customers, built on Next.js with Clerk for authentication. Every row we serve belongs to exactly one company, and companies must never see each other. That sentence isn't hard to... - Source: dev.to / 24 days ago
For hosted auth, the market has a few solid options. Auth0 is the incumbent — mature, well-documented, but the pricing can surprise you as you scale. Clerk is developer-friendly with great React components, though you're fairly locked... - Source: dev.to / 4 months ago
We mostly go with solutions that don't let us worry or deeply invest in authentication like third party services such as Clerk, a BaaS like Supabase or even Better Auth, so we have auth ready in seconds and we can ship fast. - Source: dev.to / 5 months ago
Tracking Cozystack since Feb 2024.
When comparing Clerk Authentication and Cozystack, 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 Clerk Authentication or Cozystack:

Open Source Identity and Access Management for modern Applications and Services.
Compare Keycloak to Clerk Authentication or Cozystack:

A small framework for server-rendered universal JavaScript apps
Compare Next.js to Clerk Authentication or Cozystack:

Enterprise-grade identity management for all your apps, users & devices
Compare Okta to Clerk Authentication or Cozystack:

The world's best login box, powered by WorkOS + Radix.
Compare AuthKit to Clerk Authentication or Cozystack:

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 Clerk Authentication or Cozystack: