Ask a developer building a new product in 2026 which auth provider they chose, and you will get a story about pricing. Not about features. The auth market has commoditized faster than almost any other piece of the modern stack, and the commodity price floor has settled at a number that makes the incumbent look like a relic.

The incumbent is Auth0, now part of Okta. The acquisition by the workforce-identity giant was supposed to be a growth story. Instead it created a pricing and positioning schism that has turned a premium customer-identity product into something developers actively avoid until they have no other choice.

The Okta arc

Auth0 was built as a Customer Identity and Access Management (CIAM) product, purpose-made for B2C and B2B applications where the end user is a customer, not an employee. Okta was built for workforce identity, employee access to internal tools. As a LinkedIn analysis by BLS360 notes, the two products served fundamentally different markets before the acquisition.

Post-acquisition, the product lines have converged in ways that benefit Okta’s enterprise revenue model more than Auth0’s startup-friendly legacy. The Okta Customer Identity Cloud (CIC), which wraps Auth0’s underlying technology, offers a Developer free tier up to 15,000 monthly active users, then jumps to Starter at $2 per MAU per month with a $300 monthly minimum, and Plus at $6 per MAU per month, according to PublicAPIs.io’s 2026 comparison. Auth0’s own branded tiers are even tighter: a free tier up to 7,500 MAU, Essentials at $35 per month for up to 1,500 MAU, Professional at $240 per month for up to 1,500 MAU, and Enterprise custom pricing, per the same source.

The gap between the free tier and the first paid tier is steep. A team that grows from 7,000 MAU to 8,000 MAU on Auth0’s free plan does not graduate gracefully. It hits a wall, and the wall has a $240 per month price tag for a Professional plan that still only covers 1,500 MAU. The math does not work for a startup still figuring out product-market fit.

Meanwhile, Okta has been pushing into AI agent identity. Auth0’s blog post on AI agents for nonprofits describes features like Token Vault for secure token handling, Fine-Grained Authorization (FGA) for RAG, and Asynchronous Authorization for human-in-the-loop approval. These are real capabilities. They are also capabilities that almost no early-stage startup needs.

The result is a product pulled in two directions. It offers enterprise-grade CIAM with workforce-identity lineage and AI agent features that matter at scale. But its pricing no longer matches the risk profile of a team that might never need any of that.

The gap between the free tier and the first paid tier is steep. A team that grows from 7,000 MAU to 8,000 MAU on Auth0’s free plan does not graduate gracefully.

The 50,000-MAU floor

While Auth0 and Okta CIC have been raising their entry prices, the rest of the market has converged on a different number. Supabase Auth, Firebase Authentication, AWS Cognito, and Microsoft Azure AD B2C all offer a free tier of 50,000 monthly active users, according to PublicAPIs.io’s comparison. That is not a coincidence. It is a de facto commodity floor, set by the cloud providers who treat auth as a loss leader for their broader platform.

Supabase Auth offers Pro at $25 per month for up to 100,000 MAU, Team at $599 per month, and Enterprise custom pricing. Firebase Authentication offers Spark free up to 50,000 MAU and Blaze pay-as-you-go at $0.0055 per verification beyond that, with no monthly minimums. AWS Cognito offers 50,000 MAU free, then $0.0055 per MAU beyond, with advanced security features at $0.05 per MAU. Azure AD B2C offers 50,000 MAU free, Premium P1 at $0.00325 per MAU, and Premium P2 at $0.01625 per MAU.

The structural advantage is obvious. A team that picks Supabase for its database gets Supabase Auth for free up to 50,000 MAU. A team on Firebase gets Firebase Auth for free up to the same threshold. The auth provider is bundled into the platform decision, and that decision is made early, before the team knows whether it will ever need Auth0’s feature depth.

Auth0’s 7,500-MAU free tier looks like a relic of a pre-commodity era. Not because Auth0 is bad. Because the market has moved underneath it.

The inflection points

Run the numbers at two common thresholds.

At 10,000 MAU, Supabase Auth costs $25 per month on the Pro plan. Firebase Authentication costs nothing on the Spark free tier. Auth0’s Professional plan costs $240 per month and covers 1,500 MAU, meaning a team at 10,000 MAU would need multiple Professional tiers or Enterprise custom pricing. The cost gap is not a factor of two or three. It is an order of magnitude.

At 100,000 MAU, Supabase Auth still costs $25 per month on the Pro plan. Firebase Authentication would cost roughly $275 per month on Blaze pay-as-you-go, assuming all 50,000 MAU beyond the free tier are charged at the verification rate. Auth0 would require Enterprise custom pricing at that volume, and the Okta CIC Starter tier at $2 per MAU per month would cost $200,000 per month at 100,000 MAU, before the $300 monthly minimum even matters.

These are not edge cases. They are the growth path of a normal software business. A team that picks Auth0 at 1,000 MAU and grows to 100,000 MAU faces a pricing shock that can consume its entire infrastructure budget. A team that picks Supabase Auth or Firebase Authentication at the same starting point faces a cost increase that is manageable, predictable, and in Supabase’s case, nearly flat.

The rational choice for most teams is to start with the platform-native auth provider and only migrate to Auth0 or Okta CIC when the feature gap actually hurts. That threshold is higher than most founders assume.

The deprecation risk

Social login providers have a history of deprecating or restricting free tiers. The specific graveyard is hard to pin down without naming providers whose policies have changed, but the structural risk is clear. Every major auth provider has shown pricing volatility. Auth0’s tier jumps are dramatic. Okta CIC’s per-MAU minimums create a floor that can catch a growing team off guard. Firebase Authentication and AWS Cognito have both adjusted their free tier terms over time.

The risk is not that a specific provider will disappear. It is that any provider can price itself out of a startup’s budget without warning. A team that builds deeply on Auth0’s custom database connections or Okta CIC’s Universal Directory faces a painful migration if the pricing becomes untenable. A team that builds on Supabase Auth or Firebase Authentication faces the same risk, but the cost of switching is lower because the auth layer is simpler and the data lives in a standard Postgres or Firestore database.

The deprecation risk is real. It is also symmetrical across all providers. The question is whether the provider’s pricing model gives you room to grow before you have to make that decision.

Decision matrix

For a solo developer or an early-stage team with fewer than 10,000 MAU, the choice is straightforward. Supabase Auth or Firebase Authentication offer the best free-tier economics. Supabase Auth gives you Postgres underneath, which means your user table is portable. Firebase Authentication gives you Google’s infrastructure and a massive ecosystem. Neither requires a credit card at the start.

For a team scaling past 100,000 MAU, the build-your-own path on Supabase or Firebase remains cheaper than Auth0. The trade-off is feature depth. Auth0 currently provides AI agent identity features, Token Vault, FGA for RAG, and asynchronous authorization, that the platform-native providers do not. But those features matter at a stage most startups will not reach before Series B, if they reach it at all.

The honest summary is that auth in 2026 is a platform decision disguised as a vendor decision. Pick your database first. Pick your cloud provider second. The auth provider will follow, and it will be cheaper than you expect, unless you pick the one that used to be the default.