ClerkAuthentication and user management for modern web apps

FusionAuthDownloadable, API-first customer identity and auth you can deploy anywhere.

Comparison · Identity & Access Management · weekly run Nov 3

Clerk vs FusionAuth

Which one do AI engines recommend, and how do they differ on price, fit and features?

The short answer

Clerk is the stronger AI pick in Identity & Access Management: it has a visibility score of 3.1 versus 1 for FusionAuth, and ranks ahead in 50% of the answers that name both.

Choose Clerk if…

You want the brand AI engines rank higher (3.1 vs 1)
You want a lower entry price ($25 vs $162)
You need SOC 2 Type 2 or HIPAA or GDPR (EU-U.S. Data Privacy Framework) or CCPA coverage
Free user management up to 1,000,000 MAUs

Choose FusionAuth if…

AI answers describe it more positively (100% vs 56% positive)
You need a self-hosted or on-premises option
You need SOC 2 Type II or ISO 27001 or HIPAA BAA available or GDPR coverage
Clear public pricing tiers

AI visibility side by side

Latest weekly run · Nov 3

Metric	Clerk	FusionAuth
Visibility score	3.1%	1%
Change vs last week	up+1.6%	up+1%
Rank in Identity & Access Management	#22	#29
Share of voice	1.3%	0.4%
Mentions this run	4	1
Positive in AI answers	56%	100%

The stronger value in each row is marked with a ✓.

Visibility score trend

Weekly runs over the last 60 days

Clerk +0.6000000000000001pp · FusionAuth +0.6pp over 1 weekly runs.

Engine by engine

Clerk leads on 2 of 3 engines

ChatGPT

1.1%

AI Mode

3.7%

Perplexity

2.4%

ClerkFusionAuth

Head to head in AI answers

2 engine answers name both brands

1Clerk ranked higher

1FusionAuth ranked higher

Prompt	Engine	Clerk	FusionAuth
Top identity and access management platform options for B2B SaaS companies	ChatGPT	#8	#9
Which identity and access management platform has transparent pricing?	AI Mode	#5	#4

Features, pricing & fit

Dimension	Clerk	FusionAuth
Pricing model	Usage-based	Usage-based
Entry price	Free; paid from $25 / mo	Free; paid from $162 / mo
Free plan	Yes	Yes
Deployment	Cloud (SaaS)	Self-hosted, on-premises, hybrid, air-gapped, or FusionAuth Cloud (dedicated hosting)
Compliance	SOC 2 Type 2, HIPAA, GDPR (EU-U.S. Data Privacy Framework), CCPA	SOC 2 Type II, ISO 27001, HIPAA BAA available, GDPR
Support	Community Discord, Email support, Priority support, Dedicated technical account manager	Community forums and GitHub, Email support, 24/7 email and phone support, Private Slack channel
Founded	2019	2009
Headquarters	San Francisco, CA, United States	Broomfield, CO, United States
Employees	51–200	51–200
Funding	Series C · $101M raised	Growth (led by Updata Partners) · $65M raised
Best for	Developers building React and Next.js apps who want prebuilt auth and user management, including B2B SaaS needing organizations and SSO	Developer and engineering teams that need customer authentication they can self-host or run on dedicated infrastructure.