The Best Multi-Factor Authentication APIs in 2026
We researched multi-factor authentication APIs through official websites, including pricing pages, plan tables, and product documentation. Products are ranked on their core verification capabilities, value for money, and verified features for adding OTP, push, passkey, and other second-factor authentication workflows to applications.
Our top picks
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Top ranked
Authgear#1 of 258.9/10A flexible MFA API for web, mobile, hosted, and self-managed deployments.
Free plan
-
Runner-up
Descope#2 of 258.8/10A broad MFA and CIAM toolkit with adaptive access, provisioning, and passwordless flows.
Free plan
-
Top-ranked free plan
FusionAuth#3 of 258.7/10A flexible MFA and identity platform with free self-hosting and paid cloud tiers.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 25 tools, best first
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Best forBroad MFA API with flexible deployment
A flexible MFA API for web, mobile, hosted, and self-managed deployments.
8.9/10★★★★☆Visit Authgear -
Best forTeams needing adaptive MFA and provisioning
A broad MFA and CIAM toolkit with adaptive access, provisioning, and passwordless flows.
8.8/10★★★★☆Visit Descope -
Best forSelf-hosted identity and MFA platforms
A flexible MFA and identity platform with free self-hosting and paid cloud tiers.
8.7/10★★★★☆Visit FusionAuth -
Best forMature customer identity with broad MFA
A broad MFA and CIAM platform for organizations that need adaptive authentication and lifecycle controls.
Pricing on request · 14-day trial Our LoginRadius verdict → Visit LoginRadiusFor vendors Sponsor this spot · #4 · $69/mo →8.6/10★★★★☆Visit LoginRadius -
Best forDeveloper-focused MFA and organization auth
Developer-focused MFA and organization auth with SSO, SCIM, RBAC, and fraud controls.
8.5/10★★★★☆Visit Stytch -
Best forAffordable infrastructure-wide MFA
Affordable MFA infrastructure with broad application, network, desktop, and legacy coverage.
8.4/10★★★★☆Visit miniOrange -
Best forMultichannel verification with mobile SDKs
A flexible multichannel verification API with mobile SDKs and usage-based pricing.
- Push verification
- Email OTP
- Webhook support
8.3/10★★★★☆Visit Telesign -
Best forPay-as-you-go multichannel verification
A pay-as-you-go verification API for multichannel authentication flows.
8.2/10★★★★☆Visit Twilio Verify -
Best forPhone-based verification with mobile SDKs
A focused phone-verification API with mobile SDKs and multiple delivery methods.
8.1/10★★★★☆Visit Sinch -
Best forMultichannel verification workflows
A multichannel verification API with workflow controls, failover, and fraud monitoring.
8.0/10★★★★☆Visit Vonage -
Best forTeams needing simple OTP delivery and reporting
A focused OTP API for teams that need multiple delivery channels and reporting.
7.9/10★★★★☆Visit Infobip -
Best forLow-cost global OTP verification
A low-cost verification API for global OTP delivery, with a focused phone-based factor set.
- Webhook support
- SMS OTP
7.8/10★★★★☆Visit Telnyx -
Best forTeams integrating Duo push and passcode authentication
A server-side API for enrolling users and verifying Duo push, phone, and passcode authentication.
- Push verification
- SMS OTP
7.7/10★★★★☆Visit Duo -
Best forFree YubiKey OTP validation API
A free, focused API for adding YubiKey OTP validation to applications.
7.6/10★★★★☆Visit YubiCloud -
Best forDevelopers integrating YubiKey credentials
A broad, open-source toolkit for developers building YubiKey authentication into apps.
- TOTP support
- Passkey support
7.5/10★★★★☆Visit Yubico -
Best forConfigurable SMS, email, and WhatsApp OTP
A configurable OTP API for SMS, email, and WhatsApp verification flows.
- Email OTP
- Webhook support
- SMS OTP
7.4/10★★★★☆Visit Bird Verify -
Best forSMS, voice, and WhatsApp OTP delivery
A focused OTP API for teams that need SMS, voice, and WhatsApp delivery.
7.3/10★★★★☆Visit Plivo -
Best forRisk-based MFA with push verification
A broad MFA API platform with risk-based push verification, starting at $499 per month.
- TOTP support
- Passkey support
- Push verification
7.2/10★★★★☆Visit Authsignal -
Best forSelf-hosted token management and auditing
A flexible Linux-based MFA server for teams that want control over tokens and audit records.
7.1/10★★★★☆Visit privacyIDEA -
Best forLow-cost open-source authentication stacks
A low-cost, flexible authentication stack with optional MFA and managed cloud hosting.
7.0/10★★★★☆Visit SuperTokens -
Best forLow-cost MFA with legacy-system bridges
A flexible, low-cost MFA server for legacy bridges and mixed deployments.
- TOTP support
- Passkey support
- Push verification
6.9/10★★★☆☆Visit OpenOTP -
Best forOpen-source enterprise token infrastructure
A flexible open-source MFA server for organizations integrating varied token and identity systems.
6.8/10★★★☆☆Visit LinOTP -
Best forSimple passwordless MFA for web APIs
A flexible passwordless MFA API with strong login options for web and API products.
6.7/10★★★☆☆Visit MojoAuth -
Best forPasswordless device-bound authentication
A flexible SDK for device-bound authentication across apps, platforms, and deployments.
- Passkey support
6.5/10★★★☆☆Visit TraitWare -
Best forTeams connecting applications to Rublon-managed MFA
A language-independent API for connecting applications to Rublon-managed MFA workflows.
6.4/10★★★☆☆Visit Rublon
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | Authgear | Yes | $50/mo | 8.9 |
| 2 | Descope | Yes | $249/mo | 8.8 |
| 3 | FusionAuth | Yes | $162/mo | 8.7 |
| 4 | LoginRadius | No | 8.6 | |
| 5 | Stytch | Yes | 8.5 | |
| 6 | miniOrange Multi-Factor Authentication | No | $2/user/mo | 8.4 |
| 7 | Telesign Verify | 8.3 | ||
| 8 | Twilio Verify | No | $0.05/unit usage-based | 8.2 |
| 9 | Sinch Verification API | 8.1 | ||
| 10 | Vonage Verify | No | 8.0 | |
| 11 | Infobip 2FA | No | 7.9 | |
| 12 | Telnyx Verify | No | $500/mo | 7.8 |
| 13 | Duo Auth API | 7.7 | ||
| 14 | YubiCloud | Yes | 7.6 | |
| 15 | Yubico SDKs | Free | 7.5 | |
| 16 | Bird Verify | No | 7.4 | |
| 17 | Plivo Verify | No | 7.3 | |
| 18 | Authsignal | No | $499/mo | 7.2 |
| 19 | privacyIDEA | Yes | Free | 7.1 |
| 20 | SuperTokens | Yes | $20/user/mo | 7.0 |
| 21 | OpenOTP Authentication Server | Yes | 6.9 | |
| 22 | LinOTP | Yes | Free | 6.8 |
| 23 | MojoAuth | Yes | $50/mo | 6.7 |
| 24 | TraitWare SDK | 6.5 | ||
| 25 | Rublon REST API | 6.4 |
Head-to-head All 28 comparisons →
- Authgear vs Descope
- Authgear vs FusionAuth
- Authgear vs LoginRadius
- Authgear vs Stytch
- Authgear vs miniOrange Multi-Factor Authentication
- Authgear vs Telesign Verify
- Authgear vs Twilio Verify
- Descope vs FusionAuth
- Descope vs LoginRadius
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How we rank Multi-Factor authentication APIs
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update