Seamless Auth review
A developer-focused auth engine with flexible deployment and core passwordless methods.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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.
Seamless Auth pros and cons
- 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
Seamless Auth fact sheet, pricing and score →
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