Auth0 vs MojoAuth

Auth0 (an Okta company) is an identity platform providing hosted login, social and enterprise SSO, and adaptive multi-factor authentication for web, mobile, and API-first applications. Both its Authentication API and Management API are secured exclusively through OAuth 2.0 / OIDC bearer tokens issued via a tenant's /oauth/token endpoint — there is no standalone API-key scheme. It bills per monthly active user, with a free tier for small projects and paid Essentials/Professional/Enterprise plans for scale.

MojoAuth is a passwordless authentication API offering OTP over SMS/email, magic links, passkeys/WebAuthn, and social login, plus SSO connections (OIDC/SAML) for enterprise buyers. Every request to its api.mojoauth.com backend requires an X-API-Key header, returning structured JSON errors ("API Key Required" / "Invalid API Key") when the key is missing or wrong. Pricing is free up to 25,000 monthly active users, with paid Startup and Enterprise plans beyond that.