Head to head
FusionAuth vs Firebase Authentication
Both platforms are scored with the same methodology and the same category rubric. Nothing on this page is influenced by advertising.
49/100Higher score | 45/100 | |
|---|---|---|
| Category rank | #6 | #7 |
| Confidence | High confidence | High confidence |
| External Reputation | 74 | 80 |
| AI Authority | 30 | 11 |
| Web Authority | 23 | 21 |
| Expert Assessment | 62 | 65 |
| TOP10 User Score | — | — |
| Pricing | Starter from $162/mo (billed annually, at the page default of 1,000 MAUs), community-forum support only, basic hosting included · free tier: Community — free, unlimited, self-hosted with core authentication features and community support (forums, Slack, GitHub); passkeys/WebAuthn and biometrics reportedly require registering a free Community licence | $0.0055 per MAU/month above 50,000 Tier 1 MAUs (Blaze plan, pay-as-you-go) · free tier: Spark plan: no payment method required; other authentication services (email, social, anonymous) included at no cost; Phone Auth listed as 'Not applicable'. With Identity Platform: 50,000 MAUs free and 50 SAML/OIDC MAUs free. |
| Pricing model | Subscription (MAU-based tiers; free self-hosted Community edition) | Usage-based (two plans: no-cost Spark and pay-as-you-go Blaze) |
| Best for | Engineering-led B2C or mid-market B2B SaaS teams that need data sovereignty or on-prem CIAM, are comfortable with OAuth2/OIDC concepts, and want an API-first platform they can start free and later move to managed hosting without switching vendors. | Consumer-facing mobile or web products with standard email/social/phone sign-in needs, especially teams already committed to Firestore or the wider Firebase/Google Cloud stack, and startups whose user base fits inside the 50,000 free MAU allowance. |
| Avoid if | You lack dedicated engineering capacity for identity work, require a truly open-source core, need 24x7 support or an SLA on a small budget, need cheap SCIM provisioning, or require FedRAMP or Zanzibar-style fine-grained authorization. | You sell enterprise SSO (SAML/OIDC billed at $0.015/MAU after 50 free users), need deep customization of login flows or fine-grained authorization, run high-volume SMS auth in expensive regions, require contractual data residency, a published SLA or a named compliance attestation, or have a hard multi-cloud portability mandate. |
| Markets | SMB, Mid-Market, Enterprise, Developers, Startups | Startups, SMB, Mobile and web app developers, Enterprise (via Identity Platform) |
| Founded | — | — |
| Headquarters | — | — |
A higher TOP SCORE means more of the evidence favours that platform on this methodology — it is not a recommendation, and it does not account for your specific requirements. Advertisers are never declared the winner of a comparison.