I need an auth-as-a-service provider that's dev-friendly and has better pricing than Auth0 for a B2C app.

If your priority is B2C + developer experience + lower cost than Auth0, I’d shortlist these:

My take

For a typical B2C startup, I'd look at Clerk and Supabase first.

• Clerk is probably the closest developer-friendly Auth0 replacement. It has prebuilt sign-in/sign-up/profile UI, SDKs, webhooks, user management, and a particularly nice developer experience. Its current free tier covers 50,000 monthly retained users (MRU), while Pro is $20/month when billed annually and includes another 50K MRU.Clerk
• Supabase Auth is the pricing play. Pro is $25/month with 100K MAU included, then $0.00325 per additional MAU. If you're already using Supabase/Postgres, the integration is especially attractive.Supabase+1
• Firebase Auth is compelling if you're building mobile-first. Identity Platform currently gives 50K MAU at no cost, with usage pricing above that.Firebase+1
• Stytch is worth considering if passwordless, magic links, MFA, or more specialized authentication flows are central to the product. Its published free tier is 5K MAU, with Standard starting around $249/month.

One important wrinkle: don't compare the headline user numbers blindly. Clerk bills monthly retained users, whereas Auth0 and Supabase generally use monthly active users. Clerk's definition can exclude users who sign up but never return after the initial period, so its economics can be better than a simple MAU-to-MRU comparison suggests.Clerk+1

If I were narrowing it down

• Next.js/React B2C web app: Clerk
• B2C + Postgres/Supabase already: Supabase Auth
• iOS/Android-heavy: Firebase Auth
• Auth is a sophisticated core product requirement: Stytch
• You want maximum control and don't mind owning infrastructure: also consider self-hosted/open-source options such as Better Auth or SuperTokens

If you tell me roughly 1K / 10K / 100K / 1M MAU, whether you need social login, passkeys, MFA, phone/SMS, and custom emails, and your stack (Next.js, React Native, Flutter, etc.), I can calculate the approximate monthly cost for each and highlight the migration/DX tradeoffs.

If your app is B2C and developer experience + cost are the priorities, I’d shortlist Clerk, Stytch, and Supabase Auth rather than defaulting to Auth0.

My ranking

1. Clerk — my default recommendation

clerk.com

For a modern B2C app, Clerk is probably where I'd start. Its current free tier covers 50,000 monthly retained users (MRUs) per app. Pro is $20/month when billed annually, with another 50K MRUs included and published overage pricing.Clerk

The important distinction is MRU vs. MAU: Clerk only counts a user after they return at least 24 hours after signing up. That's potentially much cheaper than traditional MAU billing for apps with lots of casual signups.Clerk

It's particularly good if you want:

• React/Next.js-first developer experience
• Drop-in polished UI
• Social login + passwordless/passkeys
• User profiles and account management
• Organizations if you eventually add B2B
• Good TypeScript ergonomics

Downside: if you're building a massive free/ad-supported consumer app, MRU costs can eventually become significant.

2. Stytch — strongest pure Auth0 alternative

stytch.com

I'd look very seriously at Stytch if you want authentication to be an infrastructure component rather than a big user-management platform.

Its current self-serve pricing gives you 10,000 MAUs free, with the full auth feature set rather than putting important capabilities behind increasingly expensive plans. After that, it uses pay-as-you-go pricing rather than forcing you into large MAU tiers.Stytch+1

That's attractive compared with Auth0's current B2C structure: Auth0 gives you 25K MAUs free, but its paid tiers start at $35/month and pricing gets considerably more tiered as usage increases.Auth0+1

I'd choose Stytch over Clerk when: you have a technically sophisticated team and want maximum control over the authentication experience.

3. Supabase Auth — potentially the cheapest

supabase.com

If you're already considering Postgres/Supabase, this is hard to beat on economics.

You get authentication alongside your database, storage, APIs, etc., rather than paying for a standalone identity product. The main caveat is that you're buying into the broader Supabase architecture, so it's less attractive if you already have your backend stack settled elsewhere.

What I'd pick

For a typical new B2C startup:

Clerk → Stytch → Supabase Auth I'd pick Clerk if minimizing development time is worth more than minimizing the absolute auth bill.

I'd pick Stytch if authentication is a core part of the product and you want a more API/infrastructure-oriented solution.

I'd pick Supabase Auth if you're already building around Supabase/Postgres.

One particularly important thing: don't compare the headline free-user numbers directly. Auth0 bills MAU, Clerk bills MRU, and Stytch uses MAU/pay-as-you-go. The economics can be dramatically different depending on your signup-to-retention ratio.Stytch+1

If you tell me roughly (1) expected MAUs at launch, (2) MAUs at 100K users, (3) social login vs email/password, and (4) whether you need passkeys/MFA, I can calculate a rough monthly cost comparison for Auth0 vs Clerk vs Stytch vs Supabase at 10K / 100K / 1M users.

Supabase Auth and Clerk are the top developer-friendly, cost-effective authentication-as-a-service alternatives to Auth0 for B2C applications, offering significantly higher free tiers and lower per-user scaling costs.aibizhub.io

Auth0's B2C tier scales steeply and becomes very expensive past early development limits, whereas modern alternatives bundle generous monthly active users (MAUs) into flat base tiers.aibizhub.io

Top Dev-Friendly B2C Auth Alternatives

Breakdown of Top Options

• Supabase Auth: The most cost-effective option if you are scaling quickly. Its Pro plan includes up to 100,000 MAUs for a flat $25/month , making it radically cheaper than Auth0 once your user base grows past a few thousand active users. It provides deep developer flexibility and robust multi-tenant capabilities, though it shines brightest if you use or don't mind a Postgres database backend.aibizhub.io
• Clerk: Built explicitly for modern web frameworks (like Next.js, Remix, and React) with gorgeous pre-built components (<SignIn />, <UserProfile /> ) that save dozens of frontend hours. Their Pro tier starts at $25/month with 50,000 MAUs included before charging nominal overages (~$0.02 per additional MAU), completely undercutting Auth0's per-user pricing structure.aibizhub.io
• Firebase Auth: Highly reliable and free for core email/password and social login providers. It is exceptionally easy to wire up, though it lacks the advanced B2C customization, fine-grained access control, and pre-built account management dashboards of Clerk or Auth0.

If you can share your primary tech stack (e.g., Next.js, mobile React Native, Python/Django) and your expected monthly active user count for the first year, I can calculate the exact cost projection for you.

For a B2C app, I’d generally avoid Auth0 unless you specifically need its enterprise CIAM depth (complex policies, regulated environments, lots of identity providers, etc.). There are several more developer-friendly options with better economics.Propicked

My shortlist:

Propicked AlternativeTo## My recommendation by app stage

Early-stage B2C startup (0–100k users)

Pick:

1. Clerk — fastest path to a polished product.
2. Supabase — best value if you already use Postgres.

Clerk is particularly attractive if you want prebuilt sign-in, user profiles, organizations, and session handling without building auth screens yourself.Bytes Brothers

Consumer app expecting millions of users

Pick:

• Amazon Cognito if cost is the priority.
• Supabase if you value developer velocity and control.
• Stytch if passwordless/passkeys are core.

If you are migrating away from Auth0

Consider:

• FusionAuth for Auth0-like capabilities.
• Stytch for a cleaner modern auth stack.
• Clerk if you can adopt its product model.

A practical ranking for a typical B2C app

1. 🥇 Clerk — best developer experience
2. 🥈 Supabase — best price/value
3. 🥉 Stytch — best modern auth primitives
4. FusionAuth — best control
5. Amazon Cognito — best raw cost at scale

For most B2C apps I’d choose Clerk if speed matters, Supabase Auth if cost and ownership matter, and Stytch if your product is built around passwordless/passkeys.Propicked+1

If you share your stack (Next.js, React Native, Flutter, native iOS/Android, backend language) and expected MAU (10k vs 1M vs 10M), the recommendation changes quite a bit.

Yes. For a B2C app, I’d put these at the top of the list:

My pick: Clerk

For a typical modern B2C product, Clerk is probably the closest "Auth0 but nicer for developers" option.

Its current free tier is 50,000 monthly retained users per application, and Pro is $25/month ($20/month if billed annually), also including 50K MRUs. It has prebuilt sign-in/sign-up/profile UI, social login, MFA, passkeys, APIs, webhooks, and SDKs.Clerk+1

The important pricing distinction is that Clerk bills MRUs (monthly retained users) rather than Auth0's MAUs. A user who signs up and never returns isn't counted as a retained user.Clerk

That can make a very meaningful difference for consumer apps with lots of low-retention signups.

If cost is your #1 priority: Supabase Auth

If you're already using Postgres/Supabase, I'd seriously consider Supabase Auth. Its economics are particularly attractive once you get into tens or hundreds of thousands of users. A current comparison puts Supabase Pro at $25/month with 100K MAUs included, with relatively low overage afterward.DesignRevision

The tradeoff is that Clerk generally gives you a more polished, dedicated identity-management experience, whereas Supabase makes more sense if you want auth tightly integrated with your database/backend.

One I'd consider for very large B2C: WorkOS

WorkOS AuthKit is interesting if you're expecting substantial scale. Its user-management component is currently free up to 1 million MAUs, although WorkOS has a different pricing model for enterprise SSO connections.Clerk

So if you're projecting, say, 200K–1M consumer users, I'd definitely run the numbers rather than automatically choosing Clerk.

Why I'd avoid Auth0 for a new B2C app

Auth0 is still a strong product, but its current pricing structure is increasingly difficult to justify for straightforward consumer authentication. Its pricing page currently shows a free tier up to 25K MAUs, while paid tiers add significant cost and feature distinctions.Auth0

For example, if what you need is simply:

email/password + Google/Apple + MFA/passkeys + sessions + account management + webhooks …I wouldn't start with Auth0 today unless you have a specific Auth0 capability that you need.

My rough decision tree:

• <50K retained users: Clerk
• 50K–500K users + already on Supabase: Supabase Auth
• 100K–1M+ users and auth cost is critical: compare WorkOS vs Supabase
• Mobile-first / Firebase stack: Firebase Auth
• Want to own the auth infrastructure: Better Auth
• Complex enterprise identity requirements mixed into a B2C product: Auth0/Okta becomes more defensible

If you tell me your expected MAUs (e.g. 10K / 100K / 1M), stack (Next.js, React Native, etc.), and whether you need Google/Apple/social login + MFA, I can do the actual 12-month cost comparison of Clerk vs Supabase vs WorkOS vs Auth0 for your app.

For a typical modern B2C product, Clerk is probably the closest "Auth0 but nicer for developers" option.

Its current free tier is 50,000 monthly retained users per application, and Pro is $25/month ($20/month if billed annually), also including 50K MRUs. It has prebuilt sign-in/sign-up/profile UI, social login, MFA, passkeys, APIs, webhooks, and SDKs.Clerk+1

The important pricing distinction is that Clerk bills MRUs (monthly retained users) rather than Auth0's MAUs. A user who signs up and never returns isn't counted as a retained user.Clerk

That can make a very meaningful difference for consumer apps with lots of low-retention signups.

If cost is your #1 priority: Supabase Auth

If you're already using Postgres/Supabase, I'd seriously consider Supabase Auth. Its economics are particularly attractive once you get into tens or hundreds of thousands of users. A current comparison puts Supabase Pro at $25/month with 100K MAUs included, with relatively low overage afterward.DesignRevision

The tradeoff is that Clerk generally gives you a more polished, dedicated identity-management experience, whereas Supabase makes more sense if you want auth tightly integrated with your database/backend.

One I'd consider for very large B2C: WorkOS

WorkOS AuthKit is interesting if you're expecting substantial scale. Its user-management component is currently free up to 1 million MAUs, although WorkOS has a different pricing model for enterprise SSO connections.Clerk

So if you're projecting, say, 200K–1M consumer users, I'd definitely run the numbers rather than automatically choosing Clerk.

Why I'd avoid Auth0 for a new B2C app

Auth0 is still a strong product, but its current pricing structure is increasingly difficult to justify for straightforward consumer authentication. Its pricing page currently shows a free tier up to 25K MAUs, while paid tiers add significant cost and feature distinctions.auth0.com

For example, if what you need is simply:

email/password + Google/Apple + MFA/passkeys + sessions + account management + webhooks …I wouldn't start with Auth0 today unless you have a specific Auth0 capability that you need.

My rough decision tree:

If you are moving away from Auth0 because of its steep scaling costs and want something with a modern, high-tier developer experience (DX) for a B2C application, three standout options beat Auth0 significantly on both pricing and integration speed.

Top Dev-Friendly, Budget-Conscious Auth0 Alternatives

1. Supabase Auth
   • Best for: Bootstrapped and scaling B2C apps wanting an all-in-one backend bundle.
   • Why it's dev-friendly: It features fantastic native SDKs, seamless social logins, and deep integration with PostgreSQL Row Level Security (RLS) if you use their database. Even if you just use it as a standalone auth provider, the DX is clean and lightweight.
   • The Pricing Advantage: It blows Auth0 out of the water. The Supabase Pricing Pro plan sits at $25/month and includes a massive 100,000 monthly active users (MAUs) before any extra usage charges kick in. For early-to-mid stage B2C growth, this is arguably the lowest cost on the market.reddit.com+3
2. Kinde
   • Best for: Feature-rich B2C/consumer software that wants enterprise-grade security capabilities without enterprise bloat.
   • Why it's dev-friendly: Built specifically for modern product teams with brilliant documentation, rapid setup SDKs, pre-built flows, and out-of-the-box support for passkeys, multi-factor auth, and social providers.
   • The Pricing Advantage: Check out Kinde Pricing —their free tier is exceptionally generous, and their paid Pro plans start at $25/month with robust user allowances included. It scales predictably and cleanly compared to Auth0's legacy enterprise add-on pricing model.kinde.com+2
3. Logto
   • Best for: Modern consumer identity and access management (CIAM) with a unique, cost-effective billing structure.
   • Why it's dev-friendly: Logto offers gorgeous pre-built UI components, extensive integration guides for major frameworks, and an open-source core with a fully managed cloud option.
   • The Pricing Advantage: Unlike traditional MAU models that charge you flat rates whether a user logs in once or fifty times, Logto Cloud uses a token-based/usage-friendly approach on their Pro tier starting around $24/month. Review the details directly on Logto Pricing to see how their token calculation fits your specific B2C engagement frequency.logto.io+3

(Note: Clerk is often mentioned for elite DX, but for B2C scaling, their per-MAU pricing can ramp up quickly past their lower tiers compared to Supabase or Kinde).reddit.com+2

To help narrow down the exact fit, tell me:

• What is your estimated Monthly Active User (MAU) count for the first 6–12 months?
• What tech stack (e.g., Next.js, Node, iOS, Python) is your app built on?