Auth0 vs OneLogin: Which Is Right for You?

Purpose and scope

Auth0 is a customer identity platform now operating as Okta's Customer Identity Cloud. It gives developers programmable authentication and authorization for the applications they build, including social and passwordless login, multi-factor authentication, role-based access control, and extensive customization through Actions and a large SDK and API surface. In 2026 Auth0 added a B2B-specific pricing tier aimed at multi-tenant SaaS builders. Its centre of gravity is the product engineering team that needs flexible identity for external users.

OneLogin, acquired by One Identity in 2021, is a workforce identity and access management platform. It centres on single sign-on across a catalog of more than 6,000 application integrations, multi-factor authentication, and user provisioning and lifecycle management driven by directory and HR systems. Its centre of gravity is the IT team responsible for giving employees secure, governed access to the SaaS and internal applications they use day to day.

Features

Auth0's strength is developer control and CIAM depth. Programmable login flows, fine-grained extensibility, support for many identity providers and protocols, passkeys on the free plan, and a mature SDK ecosystem let teams tailor authentication to a product without building it from scratch. The trade-off is that this flexibility carries complexity, and costs can rise sharply as monthly active users grow or as enterprise CIAM features such as advanced security and support are added.

OneLogin's strength is workforce access breadth and simplicity. Its application catalog, SSO, adaptive MFA, and HR-driven provisioning cover the core employee-access lifecycle with relatively transparent per-user pricing. The Advanced plan includes SSO, directory, and MFA, while the Professional plan adds identity lifecycle management and HR-driven identity. The trade-off is that OneLogin is less suited to developer-built customer identity, and some buyers perceive a slower roadmap and reduced mindshare since the One Identity acquisition.

Pricing and fit

The two price on different bases, which reflects their different jobs. Auth0 bills per monthly active user, with a free tier up to 25,000 MAU and paid B2C Essentials from $35 per month and B2B Essentials from $150 per month for 500 MAU, scaling with usage and features; high-MAU consumer apps and enterprise CIAM tiers can become expensive, so model active-user growth carefully. OneLogin bills per user per month, with an Advanced plan from $4 and a Professional plan from $8, which is straightforward to forecast for a known employee headcount. For low-volume customer apps, Auth0's free and self-service tiers are attractive; for workforce access, OneLogin's per-seat model is predictable.

On fit, Auth0 suits product and engineering teams adding identity to customer-facing applications. OneLogin suits IT teams centralising employee access and provisioning across SaaS and internal systems.

Implementation and ecosystem

Both platforms can stand up core capabilities quickly. Auth0 integrates into an application through its SDKs and APIs, so basic flows take days, while sophisticated, customised customer journeys take longer and require developer ownership. OneLogin deploys SSO and its application catalog in days to weeks, with provisioning and HR-driven lifecycle adding configuration time. Auth0's ecosystem is developer-oriented, with deep documentation, SDKs, and the broader Okta identity portfolio behind it. OneLogin's ecosystem is IT-administrator-oriented, with its app catalog and directory and HR integrations. The internal owners differ accordingly: Auth0 is owned by engineering, OneLogin by IT and security operations.

User sentiment

Buyers frequently note that Auth0 offers excellent developer experience, deep extensibility, and strong documentation, making it a default for teams adding customer identity, with the most common reservations centred on cost escalation at high monthly active users and the complexity that its flexibility introduces. OneLogin reviewers consistently praise straightforward workforce SSO, a broad application catalog, and relatively transparent per-user pricing, while flagging less developer-centric CIAM capability and a perception of a slower roadmap since the One Identity acquisition. Across both platforms, sentiment is strongest where the tool matched the use case: product teams value Auth0 for customer identity, IT teams value OneLogin for employee access, and dissatisfaction usually traces to applying one to the other's primary job.

Recommendation

Choose Auth0 when you are building customer-facing applications and need flexible, developer-controlled authentication and authorization, and you can model monthly-active-user costs as you scale. Choose OneLogin when your priority is centralising employee access, single sign-on, and provisioning across SaaS and internal apps with predictable per-seat pricing. Organisations that need both customer and workforce identity should not assume one product covers both well; many run a CIAM platform such as Auth0 for external users alongside a workforce IAM tool for employees. The decision turns on whether your binding need is customer identity in your own apps or governed employee access.

Alternatives to both