FusionAuth may suit teams managing end users at scale that need configurable authentication and authorization.
Free plan Free trial From $162 a month, billed yearly AndroidiPhone & iPadWebWindowsMacLinux+2
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Best API Authentication Platforms 2026
API authentication platforms help teams control sign-in and access for applications that use APIs. This list helps buyers compare deployment options, pricing models, free plans and trial periods.
Listings follow the page's current order and are not presented as a scored ranking. Compare the maker-published platform support and pricing details before choosing a tool.
02
Okta Customer Identity Cloud
Auth0 may suit organizations building customer sign-in and access workflows across applications, including teams that need single sign-on, passwordless methods, or…
AndroidiPhone & iPadWeb+4 Record5.6 Visit
03
Descope
Descope suits teams building B2C or B2B applications that need authentication, user management or authorization.
AndroidiPhone & iPadWeb+2 Record5.4 Visit
04
Clerk
Clerk may suit application teams that need sign-in, user profiles, organization management, or subscription billing.
AndroidiPhone & iPadWeb+2 Record5.3 Visit
05
Curity Identity Server
WebMacLinux+2 Record5.1 Visit
6
Frontegg
AndroidiPhone & iPadWeb+1 Free plan Record5.0 Visit Frontegg is aimed at developers and architects building customer-facing products, as well as infosec, customer success, support and product teams.
7
Stytch
AndroidiPhone & iPadWeb+1 Free plan Record4.9 Visit Stytch suits developers building applications that need identity tools for people, AI agents, or business organizations.
9
Amazon Cognito
AndroidiPhone & iPadWeb+1 Free plan Record4.5 Visit Cognito may suit developers building web or mobile applications that need user sign-in, access control, or AWS service access.
Before you choose
Match the deployment platform
Check whether the platform you need is supported. Options listed for this category include web, API, iOS, Android, self-hosted and Linux deployments.
A tool that supports self-hosted or Linux deployment may fit a different setup than a web or API service.
Separate free plans from trials
A free plan provides a stated no-cost option. A free trial gives access for a stated period, which can be 14 or 30 days among the listed offers.
Check the offer type before comparing tools. A trial and a free plan are different terms.
Read the pricing model
The list includes freemium, free and paid pricing models. Keycloak is marked free with an open-source note, while LoginRadius and PingOne are marked paid.
Freemium tools can pair a free plan with paid pricing. Review the listed paid starting point when that figure is provided.
Check the current offer
Pricing notes can include annual billing, a monthly starting price, a free plan or a trial period. Use those details to frame a comparison rather than treating labels as interchangeable.
If you need to read or change the code, check the tool's licence and deployment terms before committing.
Questions
What platforms do these API authentication tools support?
Platforms listed for this category include web, API, iOS, Android, self-hosted and Linux.
Can I start with a free plan?
A free plan is offered by tools on this list. Keycloak is marked free and has an open-source pricing note.
Which tools list a free trial?
Curity Identity Server and LoginRadius list 14-day trials. Okta Customer Identity Cloud and PingOne list 30-day trials.
What pricing models appear on the list?
The listed pricing models are freemium, free and paid.
Does a free plan have the same terms as a free trial?
No. A free plan and a free trial are separate offer types. Check the pricing note for the tool you are considering.
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