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Best Multi-Factor Authentication APIs in 2026

Multi-factor authentication APIs add extra checks to sign-in flows, such as passkeys, push verification, TOTP, SMS OTP, or email OTP. They are for teams building authentication into web, mobile, or backend products.

25 apps
Research read 23 Sept 2026
How the order is worked out

1

Authgear

Free plan Open source AndroidAPIiPhone+2

Authgear covers sign-in, user management, and SSO, with SDKs, APIs, and self-hosting support.

9.3 Free plan · paid from $50/mo Visit site
2

SuperTokens

Free plan Open source AndroidAPIiPhone+3

Choose SuperTokens if you need customizable authentication and want the option to self-host its Core or use managed Cloud.

8.7 Free plan · paid from $0.02/user/mo Visit site
3

Descope

Free plan AndroidAPIiPhone+2

Descope combines visual authentication-flow design with SDKs, APIs, and a broad range of authentication methods.

7.6 Free plan · paid from $249/mo (annual) Visit site
4

FusionAuth

Free plan AndroidAPIiPhone+5

FusionAuth offers identity management with multiple authentication methods, standards, and deployment options.

7.5 Free plan · paid from $162/mo (annual) Visit site
5

LinOTP

Free plan AndroidAPIiPhone+4

LinOTP offers a broad range of authentication methods, integrations, and deployment choices as open-source software.

7.5 Open source Visit site
6

miniOrange Multi-Factor Authentication

Free plan LinuxMacSelf-hosted+2

miniOrange combines endpoint, VPN, web-app, and legacy-application MFA with adaptive policies and reporting. The free trial offers a way to evaluate the listed features before choosing a paid plan.

7.4 From $2/user/mo · 30-day trial Visit site
7

MojoAuth

Free plan AndroidAPIiPhone+2

Choose MojoAuth for consumer app authentication when passwordless sign-in, developer tools, and a gradual move from passwords matter.

7.4 Free plan · paid from $50/mo · 30-day trial Visit site
8

Bird Verify

Free plan APIWeb

Bird Verify offers several code-delivery channels and controls for verification sessions and workspaces. Account for message charges and country-specific channel availability when planning its use.

7.3 From $0.00 Visit site
9

OpenOTP Authentication Server
by OpenOTP Authentication Server
Free plan AndroidAPIiPhone+5

Choose OpenOTP if you need MFA for network access with a choice of deployment, authentication methods and directory integrations.

7.3 Free plan · 30-day trial Visit site
10

privacyIDEA

Free plan AndroidAPIiPhone+4

Choose privacyIDEA if you need an open source authentication server for adding two-factor authentication to existing services and want a WebUI, integrations, and multiple token types.

7.3 Open source Visit site
11

Sinch Verification API

Free plan AndroidAPIiPhone+1

Sinch Verification API offers several phone-based verification methods and developer access through REST and mobile SDKs.

7.2 Visit site
12

Stytch

Free plan AndroidAPIiPhone+1

Stytch combines a broad set of identity, access-control, and fraud tools with implementation options for frontend and backend developers.

7.2 Free plan Visit site
13

Plivo Verify

Free plan APIWeb

Choose Plivo Verify if your direct brand needs configurable OTP delivery and Fraud Shield, and can meet the monthly commitment.

7.0 Visit site
14

Authsignal

Free trial AndroidAPIiPhone+1

6.6 From $499/mo · 30-day trial Visit site
15

LoginRadius

Free trial AndroidAPIiPhone+2

LoginRadius covers authentication, access management, integrations, and deployment choices for customer identity. The 14-day trial offers a way to evaluate it, while pricing requires a request.

6.3 Pricing on request · 14-day trial Visit site
16

TraitWare SDK

Free trial AndroidAPIExtension+6

5.9 Pricing on request Visit site
17

Twilio Verify

Free trial APIWeb

Twilio Verify provides a broad set of verification channels and controls through an API.

5.6 From $0.05 Visit site
18

YubiCloud

Free plan Web

5.6 Free plan Visit site
19

Infobip 2FA

Paid Web

4.5 60-day trial Visit site
20

Telesign Verify

Paid AndroidiPhoneWeb

4.5 Visit site
21

Duo Auth API

Paid

4.4 Pricing on request Visit site
22

Yubico SDKs

Paid AndroidiPhoneLinux+2

4.4 Open source Visit site
23

Vonage Verify

Paid Web

Vonage Verify offers two paid approaches to messaging-based verification.

4.3 Visit site
24

Telnyx Verify

Paid Web

4.1 From $0.03 Visit site
25

Rublon REST API

Paid

3.9 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free plans, paid starting prices, trial terms, supported SDK languages, webhooks, and the verification methods you need. Check platform fit across web, API, Android, iOS, self-hosted, and Linux. If you need to inspect or change code, review the licence and deployment terms.

Questions

Do multi-factor authentication APIs have free plans?

A free plan is offered by services in this category. Check limits and included methods before using one for a live system.

Can I try a paid MFA API before paying?

Trial periods vary. Listed examples include 14-day, 30-day, and 60-day trials; some paid services list pricing on request without a stated trial.

Which MFA methods should I compare?

Compare passkeys, push verification, TOTP, SMS OTP, and email OTP against your sign-in and recovery needs.

Can I self-host an MFA API?

Self-hosted and Linux platforms appear among the deployment options. Confirm the service's platform support and licence before selecting a self-hosted setup.

What integration details matter for an MFA API?

Check supported SDK languages, webhook support, API access, and compatibility with your web, Android, or iOS application.

Questions

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