Seamless Auth
Seamless Auth: A developer-focused auth engine with flexible deployment and core passwordless methods. Ranked #20 of 27 in Passwordless Authentication Software by our editors (7.1/10); pricing: 14-day trial; best for developers wanting self-hosted basic passwordless auth.
At a glance
- Editor score7.1 / 10
- Pricing14-day trial
- Best forDevelopers wanting self-hosted basic passwordless auth
- Free planNo
- Paid from$49/mo
- Facts checked20 Sep 2026
Where it wins
- Open-source engine supports managed hosting or self-hosting
- Passkeys, magic links, OTP, OAuth, and TOTP MFA
- Sessions, organizations, memberships, and audit data included
Where it doesn't
- No free plan beyond the 14-day trial
- Enterprise identity breadth is narrower around SSO and directory sync
- Biometric authentication is not part of the listed feature set
Our verdict on Seamless Auth
Built for application developers and product teams, this passwordless authentication infrastructure supports passkeys, magic links, email and phone OTP, OAuth, TOTP MFA, session management, organizations, memberships, and user administration. It runs as a managed hosted instance or as a self-hosted open-source authentication engine, with web, iOS, Android, API, and self-hosted deployment options. React, React Native, Express, OAuth providers, and Postgres integrations extend its fit across common application stacks.
The pricing structure starts with a 14-day free trial that includes a full managed auth instance, core passwordless methods, TOTP MFA, and no credit card requirement. The MVP plan costs $49 per month and adds managed hosting, unlimited users, a dedicated authentication service and database, authentication events, and one day of log retention. Business costs $149 per month and adds authentication audit logs, configurable rate limits and TTLs, and seven-day log retention. Enterprise uses tailored deployments with advanced compliance support and higher-scale or custom infrastructure options. Teams should choose the paid tier based on their need for retention, audit detail, and deployment customization.
Its strongest fit is for teams that want control over the authentication engine and a focused set of passwordless flows rather than a broad enterprise identity suite. The available integrations and CLI support local and self-hosted workflows, while session issuance, refresh, and revocation cover core application needs. Enterprise buyers seeking verified SSO, OIDC, directory synchronization, or biometric support should consider a product with broader identity and device capabilities. For developers prioritizing open-source deployment, passkeys, magic links, OTP, and straightforward monthly plans, this is a focused option.
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Seamless Auth pricing
All 4 Seamless Auth plans and prices →
Seamless Auth fact sheet
| Free plan | No |
|---|---|
| Paid from | $49/mo |
| Passwordless methods | passkeys, magic links, email OTP, phone OTP, OAuth |
| Magic links | Yes |
| Biometric login | Not verified |
| SAML SSO | Not verified |
| OpenID Connect | Not verified |
| Directory synchronization | Not verified |
| Free trial | 14 days · no card needed |
| Deployment | Cloud, Self-hosted, Mobile |
| Platforms | Web, iOS, Android |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 5 integrations: React, React Native, Express, OAuth providers, Postgres |
| Pricing | 14-day trial (source) |
| Website | seamlessauth.com |
| Facts checked | 20 Sep 2026 |
Seamless Auth integrations
Seamless Auth lists 5 integrations on its own site.
- React
- React Native
- Express
- OAuth providers
- Postgres
Alternatives to Seamless Auth
- Cisco Duo PasswordlessA broad passwordless suite with strong authentication coverage and a low-cost entry tier.9.3
- Secret Double OctopusA broad hybrid authentication platform for organizations securing users, devices and legacy access.8.9
- Ivanti Passwordless AuthenticationEnterprise passwordless authentication with FIDO2, biometrics, risk policies and desktop login.8.8
See all Seamless Auth alternatives →
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Seamless Auth is listed in our Passwordless Authentication Software directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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