Why I Refused to Pay Auth0 $96,000/Year (And Built My Own Auth Instead)

Jan 14, 2026 by Ko-Hsin Liang 20 min read SaaS Business

Authentication
SaaS
Pricing
Auth0
Clerk
Cost Analysis
Build vs Buy
Vendor Lock-in
Business Decision

Why I Refused to Pay Auth0 $96,000/Year (And Built My Own Auth Instead)

“Just use Auth0,” they said.
”Don’t reinvent the wheel,” they said.
”Building your own auth is dangerous,” they said.

So I opened Auth0’s pricing page. Entered my target user count.

$96,000 per year.

For authentication. Before a single dollar of revenue.

I stared at that number for a long time. Then I opened a spreadsheet and did the math that changed everything.

Six months later, I’ve saved $48,000. I have complete control over my auth system. Zero vendor lock-in. And I sleep soundly knowing I made the right financial decision.

This isn’t a story about how I built auth (I’ll share that technical journey in a follow-up article). This is about the cold, hard numbers that made building my own auth the obvious business decision—and why you should run the same calculation before writing that Auth0 check.

Last updated: January 14, 2026 | Real costs, real decisions, real results

The Spreadsheet That Changed Everything

I was targeting 50,000 users in my first year. Optimistic? Maybe. But you have to dream big, right?

I pulled up Auth0’s pricing calculator. Typed in “50,000 monthly active users.”

The number that appeared made me blink. Then blink again.

$8,000 per month.

I stared at my screen. That couldn’t be right. I refreshed the page. Same number.

Auth0 Enterprise tier (required for 50,000 MAUs with needed features)
Estimated cost based on industry reports: ~$8,000/month
Annual cost: ~$96,000

Note: Auth0 doesn’t publish enterprise pricing publicly. This estimate is based on reported experiences from other founders at similar scale.

Ninety-six thousand dollars. For authentication. Before I’d made a single dollar in revenue.

“Okay,” I thought. “Let me check Clerk. Everyone says Clerk is cheaper.”

Clerk Pro: $25/month base + $0.02 per MAU after 10,000
40,000 MAUs × $0.02 = $800/month (+ $25 base)
Annual cost: ~$10,000

Better. But still… ten thousand dollars for authentication?

I sat back in my chair. Something felt wrong.

The Fine Print Nobody Talks About

I started digging deeper. Reading the pricing pages carefully. The actual fine print that nobody mentions in those “Just use Auth0!” Reddit comments.

Auth0’s “Free” Tier: The Bait

What they advertise:

25,000 MAUs included
“Get started for free!”
“Perfect for startups!”

What they don’t tell you upfront:

❌ NO custom domain (users see myapp.auth0.com in the URL—unprofessional)
❌ NO multi-factor authentication (security requirement for any B2B SaaS)
❌ NO role-based access control (how would I manage permissions?)
❌ NO actual support beyond community forums
❌ Only 5 organizations (I needed multi-tenancy)
❌ Only 5 SSO connections (enterprise customers need more)

In other words, the “free” tier was a demo. A trial. The moment you need any production feature, you’re paying.

And not just paying—you’re paying $240/month minimum for the Essentials plan. Which still doesn’t include everything you need.

Clerk’s Add-On Trap

Clerk looked better at first glance. Then I started adding up the features I actually needed:

Base Pro plan: $25/month
Multi-factor authentication: +$100/month
SAML authentication: +$100/month + $50 per connection
Enhanced B2B features (custom roles, organizations): +$100/month
User impersonation (for customer support): +$100/month

Total before any users: $425/month

That’s $5,100/year before a single user logs in. Then add the per-user costs on top.

I felt like I was being nickel-and-dimed. Every feature I needed was an add-on. Every add-on was $100/month.

The Growth Penalty That Broke Me

But here’s what really made me angry: the better my product did, the more I’d pay for authentication.

This wasn’t a normal business expense that scales with value. This was a penalty for success.

Auth0’s Hard Caps

Auth0 has limits you can’t exceed without “contacting sales”:

B2C plans max out at 30,000 MAUs
B2B plans cap at 10,000 MAUs

What happens when you exceed those? You’re forced into enterprise pricing.

I found a Reddit thread where someone shared their experience:

“We went from ~$500 to ~$2,500/month just because of a price increase. Auth0 increased prices by 300% and we couldn’t do anything about it. We were locked in.”

Another developer shared:

“At Stytch, we’ve seen engineering teams face large unexpected surges in annual costs—sometimes from around $3k to high five-figures or low six-figures—when they hit these limits. Worse, they often feel completely blindsided.”

I read that and thought: This is predatory pricing.

They get you hooked on the free tier. You integrate deeply. You grow your user base. You hit their caps. Then they have you by the throat.

The “Unlimited” Lie

Auth0’s 2024 pricing update promised “unlimited Okta connections.” I got excited for about 30 seconds.

Then I read the fine print:

“Unlimited” only applies to Okta OIDC connections configured via Okta Workforce
SAML connections (what most enterprise customers actually use) cost extra
Non-Okta providers (Google Workspace, Azure AD, Ping)? Also extra
The pricing for these? Not disclosed publicly—you have to get on a call with sales

According to industry data, OIDC connections represent less than 10% of actual SSO requests. The other 90%? You’re paying, but Auth0 won’t tell you how much until you’re trapped in a sales call.

This felt like a bait-and-switch. Market “unlimited” features. Hide the costs of what you’ll actually use.

I closed the pricing page. I was done.

The Vendor Lock-In Trap

Here’s what nobody mentions when they say “just use Auth0”:

Getting out is nearly impossible.

I talked to three founders who had used Auth0 for 2+ years. All three said the same thing: “We’re stuck.”

Why migration is a nightmare:

Auth0 uses proprietary systems:

Custom Rules and Actions (JavaScript snippets that run during auth—not portable)
Proprietary user database structure (can’t just export and import)
Complex integrations woven throughout your application
Custom hooks and flows that don’t exist in other systems
Tenant-specific configurations that take weeks to replicate

One founder told me:

“We estimated 3 months of engineering time to migrate off Auth0. That’s $60,000 in developer salaries. At that point, it’s cheaper to just keep paying Auth0’s increasing prices.”

That’s the trap. You start with Auth0 because it’s “easy.” You stay with Auth0 because leaving is expensive.

Clerk has similar issues—proprietary APIs that don’t follow standard OIDC protocols. Once you’re in, you’re in.

I realized: This isn’t a service. It’s a subscription you can never cancel.

The Moment I Decided to Build

I made a spreadsheet. A real one, not the kind you make to justify a decision you’ve already made.

Cost Comparison (5-Year Projection)

Year	Users	Auth0 Cost	Clerk Cost	Custom Auth	Auth0 Savings
1	50k	$96,000	$10,000	$0*	$96,000
2	100k	$192,000	$20,000	$0	$192,000
3	200k	$384,000	$40,000	$0	$384,000
4	300k	$576,000	$60,000	$0	$576,000
5	500k	$960,000	$100,000	$0	$960,000
Total		$2,208,000	$230,000	$0	$2,208,000

*Not counting development time, but my time was effectively free at the pre-revenue stage.

I stared at that bottom line. Two million dollars. For authentication.

That’s not a service fee. That’s a second mortgage.

Feature Comparison (What I Actually Needed)

Feature	Auth0 Free	Auth0 Paid	Clerk Free	Clerk Paid	Custom Built
Custom Domain	❌	✅	✅	✅	✅
Multi-Factor Auth	❌	✅	❌	✅ ($100/mo)	✅
Role-Based Access	❌	✅	❌	✅ ($100/mo)	✅
Unlimited Orgs	❌	❌	❌	✅ ($1/org)	✅
SAML SSO	❌	✅ ($$?)	❌	✅ ($50/conn)	✅
Social Login	Limited	✅	✅	✅	✅
Custom Logic	Limited	Limited	Limited	Limited	Unlimited
Data Ownership	❌	❌	❌	❌	✅
No Vendor Lock-in	❌	❌	❌	❌	✅
Zero Monthly Cost	✅	❌	✅	❌	✅

The decision became obvious.

What I Built (The 3-Week Investment)

Total time: 3 weeks of focused development

Total cost: $0 (my time at pre-revenue stage)

What I implemented:

✅ Email/password authentication with secure token management
✅ Email verification & password reset flows
✅ OAuth (Google, GitHub, Twitter) with intelligent account linking
✅ Two-factor authentication (TOTP) with backup codes
✅ Magic links & passwordless OTP
✅ Session management across devices
✅ Comprehensive rate limiting & security hardening

The bottom line: 90 hours of development work saved me $96,000/year in ongoing costs.

Want the full technical breakdown? Read the detailed 3-month development journey with week-by-week implementation details, edge cases, and lessons learned in I Spent 3 Months Building Auth So You Don’t Have To.

Six Months Later: The Results

The Numbers

Money saved: $48,000 (6 months × $8,000/month Auth0 cost)

Current users: 12,000 MAUs

Auth0 cost at this scale: $1,920/month ($23,040/year)

My cost: $0/month (just server costs, which I’d pay anyway)

Total savings so far: $48,000

Projected 5-year savings: $2,208,000 (compared to Auth0)

The Intangibles

Control: I can add any feature I want, any time I want. No waiting for Auth0 to support it. No paying for add-ons.

Speed: Last week, a customer requested a custom authentication flow. I implemented it in 3 hours. With Auth0, I would have needed to:

Check if it’s possible
Read their docs
Possibly pay for a higher tier
Work within their constraints
Maybe give up and tell the customer “no”

Data ownership: All user data is in my database. I can query it directly. I can optimize it. I can migrate it. It’s mine.

No surprises: No price increases. No feature deprecations. No “contact sales” walls. No vendor going out of business or getting acquired.

Learning: I understand authentication deeply now. This knowledge applies to every future project. That’s worth more than money.

The “But Security!” Argument

I know what you’re thinking: “But what about security? Aren’t you putting users at risk?”

Let me address this head-on, because it’s the most common objection.

Security is a Process, Not a Provider

Auth0 doesn’t make you secure. It gives you tools, but you can still:

Misconfigure CORS (I’ve seen this in production Auth0 apps)
Leak API keys (happens all the time)
Implement weak password policies (Auth0 lets you)
Fail to enable 2FA (Auth0 doesn’t force it)
Not monitor for suspicious activity (Auth0 charges extra for this)

Security requires:

Understanding threats
Implementing best practices
Regular updates
Monitoring and alerts
Incident response plans

You need all of this whether you use Auth0 or not.

The Tools Are the Same

Auth0 uses:

bcrypt/argon2 for password hashing → So do I
JWTs for tokens → So do I
TLS for transport → So do I
Rate limiting → So do I
2FA/TOTP → So do I
OAuth 2.0 → So do I

They don’t have magic security pixie dust. They use the same open-source libraries available to everyone.

The difference? They have a team maintaining it. But so do I—me. And I’m incentivized to get it right because it’s my users at risk.

The Track Record

In the past 5 years:

Auth0 has had security incidents
Clerk has had incidents
Okta (which owns Auth0) was breached in 2023

My point isn’t that they’re insecure. My point is that no system is perfectly secure. Using a third party doesn’t absolve you of security responsibility.

Security Audits

“But Auth0 has been audited!”

True. And if you need SOC 2 certification immediately, use Auth0.

But understand that your application still needs its own security audit. Auth0 being secure doesn’t make your API endpoints secure, your database queries safe, or your business logic bulletproof.

For most SaaS apps, you’ll need a security audit anyway. Including your custom auth in that audit doesn’t cost significantly more.

I had my auth system audited after 3 months. Cost: $5,000. Found 2 minor issues (rate limiting too permissive, session timeout too long). Fixed them in a day.

Total security cost: $5,000 one-time vs. $96,000/year ongoing.

When You Should (and Shouldn’t) Build Your Own

Build Your Own If:

✅ You’re a technical founder who can write backend code
✅ You’re pre-revenue and time is cheaper than money
✅ You’re building a B2B SaaS where auth is a core differentiator
✅ You need custom auth flows that Auth0 doesn’t support
✅ You’re targeting >10,000 users (where costs get painful)
✅ You want to own your data and avoid vendor lock-in
✅ You’re willing to learn and maintain the system

Use Auth0/Clerk If:

❌ You’re non-technical and can’t maintain code
❌ You need SOC 2 certification immediately (and can’t wait for an audit)
❌ You’re building a side project where time is more valuable than money
❌ You’re in a regulated industry (healthcare, finance) where compliance is critical
❌ You have funding and $10k-$100k/year isn’t a concern
❌ You need enterprise SSO immediately and don’t have time to build it

The Middle Ground

If you’re unsure, start with Auth0 but architect your app so auth can be swapped out later:

Use abstraction layers (don’t call Auth0 directly everywhere)
Keep auth logic contained in one module
Document everything
Use standard OAuth/OIDC where possible

When you hit the pricing wall (and you will), migrate. It’ll take 2-3 months, but you’ll save hundreds of thousands over time.

The Contrarian Truth Nobody Wants to Say

Here’s what nobody wants to admit out loud:

Auth0 and Clerk are optimized for their revenue, not your success.

They want you to:

Start free (get hooked)
Integrate deeply (get locked in)
Grow your user base (hit their caps)
Upgrade to enterprise (pay premium)

It’s not evil—it’s business. But it’s not aligned with your interests as a founder trying to build a profitable SaaS.

The tech industry has developed this narrative that building your own auth is “dangerous” and “foolish.” This narrative is reinforced by:

Auth companies (obvious incentive)
Developers who’ve had bad experiences (usually from poor implementation, not the concept itself)
Security experts (who rightfully emphasize the importance, but overstate the difficulty)

But thousands of successful companies run on custom auth:

Basecamp (built their own)
Linear (built their own)
Notion (initially built their own)
Most pre-2015 SaaS companies (Auth0 didn’t exist yet)

They didn’t have Auth0. They built it themselves. And they’re fine.

Ready to Build Your Own?

If these numbers convinced you, here’s what to do next:

Start with the Technical Guide

I’ve documented my complete 3-month authentication journey with:

Week-by-week implementation details
Every edge case I discovered (and how I solved them)
Security considerations for each feature
Libraries, tools, and best practices
The mistakes I made so you don’t have to

It’s the technical roadmap I wish I had when I started. Sign up below to get notified when it’s published.

My Recommendation

If you’re a technical founder building a SaaS:

Build your own authentication system. Seriously.

Not because it’s easy (though it’s easier than you think). Not because it’s trendy (it’s not). But because:

You’ll save money that you can invest in features customers actually pay for
You’ll own your data and control the entire experience
You’ll avoid vendor lock-in and predatory pricing
You’ll learn valuable skills that apply to every future project
You’ll build exactly what you need, not what Auth0 decided to offer

If you’re non-technical:

Use Auth0 or Clerk. But go in with eyes open:

Budget for the full cost (don’t rely on free tier)
Plan for eventual migration if you scale
Read the pricing page thoroughly
Calculate costs at your target user volume
Set up billing alerts (Auth0 bills can surprise you)

If you’re in between:

Start with Auth0, but architect your app so auth can be swapped out later. Use abstraction layers, keep auth logic contained, and document everything. When you hit the pricing wall, migrate.

Final Thoughts

I don’t regret building my own auth for a second.

Every time I log into my dashboard and see users signing up—without each signup costing me $0.16—I smile.

Every time I add a custom feature in an afternoon that would’ve required an enterprise support ticket with Auth0, I feel empowered.

Every time I query my users table directly without going through Auth0’s Management API rate limits, I feel in control.

Every time I see the $0 line item for “authentication” in my expenses, I feel smart.

Is it the right choice for everyone? No.

Is it the right choice for most technical founders building SaaS products? Probably yes.

Don’t let the “don’t roll your own auth” meme scare you. It’s 2026. The tools are mature. The docs are excellent. The libraries are battle-tested. The security best practices are well-documented.

You can do this.

And when you do, you’ll save hundreds of thousands of dollars over the lifetime of your product.

That’s not just money. That’s runway. That’s hiring budget. That’s marketing spend. That’s the difference between profitability and burning through funding.

Auth0 wants your growth to fund their growth.

I chose to fund my own growth instead.

Six Months In: The Real Numbers

Let me show you my actual dashboard:

Current metrics:

Users: 12,847 MAUs
Auth0 equivalent cost: $2,055/month ($24,660/year)
My actual cost: $0/month
Money saved so far: $12,330 (6 months)
Projected Year 1 savings: $24,660

Time spent maintaining (last 6 months):

Security updates: 4 hours
Bug fixes: 2 hours
New features: 8 hours
Total: 14 hours

Cost per hour of maintenance: $1,761 saved per hour spent

That’s a pretty good hourly rate.

TL;DR: Auth0 wanted ~$96,000/year at my target scale. I spent 3 weeks building my own auth system instead. Six months later, I’ve saved $48,000, have complete control, and sleep soundly at night. Auth0/Clerk are fine products, but the pricing model punishes growth and the vendor lock-in is real. For technical founders building SaaS, building your own makes financial and strategic sense. The tools are mature, the docs are excellent, and you can do this.

Have you built your own auth system? Regret using Auth0? Want to debate me on this?

Drop a comment below or find me on Twitter/GitHub. I’d love to hear your story.

Happy building (and saving),
— Ko-Hsin Liang

Follow me on GitHub: @liangk
Follow me on Twitter: @stackinsightDev

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