AuthKit vs Better Auth for B2B SaaS

Every B2B team ships a login form on day one. The interesting question is what happens on day 400, when your first serious enterprise customer sends a security questionnaire, asks for SAML against their Okta tenant, wants SCIM so that offboarding a departing employee revokes access in your app, and expects tamper-resistant audit logs piped into their SIEM.

Until recently the comparison between AuthKit and Better Auth had an easy shape: one was a library you ran, one was a platform someone else ran. That shape is out of date. Better Auth shipped hosted infrastructure with a dashboard, audit logs with SIEM drain, and self-service SSO and SCIM provisioning, and in July the company was acquired by Vercel, which has real operational weight behind it.

So the useful comparison is no longer library against platform. It is two platforms, and the question is which one fits a B2B product selling to IT buyers.

Logos will not settle this

Before the substance, one thing worth clearing out of the way. OpenAI appears on Better Auth's customer list. OpenAI is also a WorkOS customer. So is Databricks-adjacent infrastructure on both sides of plenty of comparisons.

What that tells you is that both products are used seriously by companies with real requirements. What it tells you about your situation is nothing. Skip the logo wall on both sites and compare the parts that map onto deals you are actually trying to close.

Where these two genuinely converge

It is worth being precise about this, because a comparison that pretends the other product is missing things it has is a comparison nobody trusts.

Better Auth ships enterprise SSO, SAML 2.0, a real SCIM 2.0 implementation, organizations with teams and invitations, RBAC, MFA, and passkeys. It is framework-agnostic across more than twenty frameworks, MIT licensed, with over 850 contributors and several million weekly downloads. Its hosted tier adds the dashboard, audit logging with a SIEM drain, self-service SSO and SCIM setup for your customers' admins, and a threat detection product.

On a feature checklist, that is close to parity with what a B2B team needs on the enterprise tier. If someone tells you Better Auth cannot do SAML or SCIM, they have not looked recently.

The difference is not the checklist. It is everything that sits behind each line on it.

The long tail is the product

SAML and SCIM are commodities. What is not a commodity is the hundredth identity provider.

WorkOS ships more than 60 pre-built integrations across SSO, Directory Sync and HRIS, with setup guides written per provider: Okta, Entra ID, Google Workspace, JumpCloud, OneLogin, PingFederate, SailPoint, CyberArk. That number is not a marketing stat, it is a maintenance commitment. Every one of those providers reads the same specification and behaves differently, which is why a generic OIDC connection needs per-connection settings for client authentication method, ID token signing algorithm, and whether profile claims arrive in the token or from the userinfo endpoint. Those settings exist because real customers hit each of those differences.

With a library in your codebase, that long tail is your backlog. Each provider a customer names that your plugin does not cover cleanly becomes work you scope, ship and maintain, at the exact moment a deal is waiting on it.

Where user lifecycle actually starts

This is the difference most feature tables miss entirely.

SCIM syncs from the identity provider. In a large company, the identity provider is not where employment ends. The HR system is. Someone is terminated in Workday on Friday, and whether that reaches your app depends on whether their IT team wired HR to the IdP and whether that sync ran.

WorkOS integrates directly with Workday, BambooHR and Rippling, so lifecycle events can come from the system that actually knows. That matters because it is the difference between "we support SCIM" and being able to answer the question a security reviewer asks, which is how quickly access is revoked after someone leaves. Those are not the same answer, and only one of them survives an audit sample.

Who is on the hook

Self-hosting the library means login uptime is your on-call rotation's problem. That is well understood and it is a legitimate choice.

The hosted comparison is more interesting, because both options now put a vendor in your auth path. The question becomes what that vendor commits to in writing. WorkOS's SLA commits to a monthly uptime of at least 99.99% for SSO, Directory Sync and Audit Logs, backed by service credits when it is missed. Better Auth's hosted offering launched in January and is early by comparison; check what its current terms commit to before you quote a number to a customer, because at some point one of your enterprise contracts will require you to.

Worth saying plainly, since it cuts against us too: any hosted dependency in your identity path is a dependency. If WorkOS is unreachable, your enterprise logins are affected, and the runbook for that is ours rather than yours. That is the trade. It is a reasonable one when the alternative is owning the operational surface yourself, and it is not a free lunch.

Two roadmaps, pointed at different quarters

Vercel's announcement was explicit that the Better Auth team continues working on agent identity, feeding that work into Vercel Connect and eve. That is a genuinely interesting problem and they are well placed to work on it.

It is also a different problem from the one a B2B SaaS team is working through this quarter. If your next two quarters are SAML edge cases, a directory sync that has to survive a customer's Workday export, and a security questionnaire with a retention question on it, the roadmap you want energy pointed at is that one. Neither roadmap is wrong. They just serve different buyers, and it is worth knowing which one you are.

What it costs, and when

AuthKit is free up to a million monthly active users. You pay for enterprise connections as customers ask for them, at $125 per connection per month for SSO and for Directory Sync, with automatic volume discounts starting at 16 connections.

That shape matches how a B2B business earns: your user management layer costs nothing while you grow, and the enterprise line item appears exactly when a customer worth the line item asks for it. You can price an enterprise deal before you sign it, because the cost scales with how many enterprise customers you have rather than how many employees they brought.

When the enterprise tier isn't your deciding factor

Not every product is on this curve yet, and if yours isn't, none of the above decides anything.

Self-hosting deserves splitting in two, because the two meanings get conflated and only one of them is a real constraint here.

If it means shipping your product into a customer's own cloud or data center, that is supported. You create a separate production environment per on-prem customer so each installation carries its own API key and stays isolated to that team, and traffic reaches the API over HTTPS on 443 through firewall rules, ACLs, or a tunnel. Past those two considerations the integration behaves the same as a cloud deployment. That is what most teams mean when a prospect says they need on-prem, and it is not a reason to rule out a hosted platform.

If it means running the authentication service itself, with nothing leaving the network, that is a different requirement and a real one. Air-gapped environments cannot reach a hosted API, and our own documentation says so plainly rather than pretending otherwise, recommending a separate deployment package that integrates with the customer's internal authentication. If that is your deployment model, the question is settled before a comparison starts.

Two others. If you are pre-enterprise, building for consumers, or selling to buyers who have never said the word SAML, the enterprise tier is a problem you can reasonably defer. And if having auth in your repository matters more to your team than anything on the enterprise checklist, that is a preference worth being honest with yourself about, because a hosted product asks you to give it up.

When it is

The rest of it comes down to three questions, and none of them is about plugin counts.

• How many identity providers can you support on the day a customer names one, without opening a ticket?
• Where do lifecycle events come from when the customer's source of truth is Workday and not Okta?
• Whose name is on the uptime commitment when a contract requires one?

Those are the questions AuthKit is built to answer, and they are the ones that decide enterprise deals. A login box is the smallest part of it. What matters is the coverage behind the plugins, the integrations that already exist so you are not building them mid-deal, and an operational surface with a team whose only job is keeping it up.

If the next twelve months of your roadmap are defined by enterprise customers, that is the trade worth making.

Start with AuthKit, or if you are already on Better Auth, there is a migration guide for users, organizations and password hashes.