Auth0 vs Firebase Authentication pricing
Both are in authentication & identity apis. Auth0 is billed mau-based; Firebase Authentication is billed mau-based (+ per-sms). Numbers below are copied from each vendor's pricing page.
Auth0Free tier or trial
- Free tier
- 25k MAU (free plan)
- Billed
- MAU-based
- Best for
- Full-featured CIAM for B2C and B2B
- Verified
- Jun 27, 2026
Firebase AuthenticationFree tier or trial
- Free tier
- 50k MAU (basic email/social)
- Billed
- MAU-based (+ per-SMS)
- Best for
- Mobile/web auth inside Firebase
- Verified
- Jun 27, 2026
Auth0 plans
| Plan | Price | What it covers |
|---|---|---|
| Free | $0 | Up to 25,000 MAU (B2C) / 500 MAU (B2B); includes social connections, basic MFA, and community support. |
| B2C Essentials | from $35-$70/mo (500 MAU) | Adds passwordless, MFA, role-based access; entry price for B2C scaled to MAU (raised toward $70/mo in late 2025). |
| B2B Essentials | from $150/mo (500 MAU) | Organizations support (unlimited orgs), B2B-oriented features, scaled by MAU. |
| B2C Professional | from $240/mo (1,000 MAU) | Adds external user databases, more MFA options (phone/email/WebAuthn/Guardian push), enhanced attack protection, longer log retention. |
| B2B Professional | from $800/mo (1,000 MAU) | Professional feature set for B2B with organizations and advanced protection, scaled by MAU. |
| Enterprise | Custom | Custom user/SSO tiers, 99.99% SLA, enterprise rate limits, advanced admin/support, private cloud options. |
- MAU-based pricing with hard caps gets expensive fast at scale; widely called a startup 'growth penalty'
- Post-Okta pricing changes seen as steep and unpredictable (reports of large bill jumps and a B2C Essentials hike)
- B2B-critical features (enterprise SSO connections, higher rate limits, custom SLA, private cloud) gated behind custom Enterprise pricing
Source: https://auth0.com/pricing
Firebase Authentication plans
| Plan | Price | What it covers |
|---|---|---|
| No-cost tier (Spark / Blaze free allowance) | $0 | First 50,000 monthly active users free for standard auth (email/password, social/federated, anonymous). |
| Standard MAU (Blaze, 50,001–100,000) | $0.0055 / MAU | Graduated per-MAU billing once you exceed the 50k free tier. |
| Standard MAU (100,001–1,000,000) | $0.0046 / MAU | Next graduated pricing band. |
| Standard MAU (1,000,001–10,000,000) | $0.0032 / MAU | Volume band; rate continues to fall to $0.0025/MAU above 10M. |
| Enterprise SSO (SAML / OIDC) | $0.015 / MAU | First 50 SAML/OIDC MAUs free, then $0.015 per MAU (requires Identity Platform upgrade). |
| Phone / SMS authentication | ~$0.01–$0.06 / SMS | Billed per SMS by destination country (US/Canada/India ~$0.01, UK ~$0.04, Brazil ~$0.05, most others ~$0.06); first 10/day free for testing. |
- Enterprise features (SAML/OIDC, MFA, SLA, real support) require the paid Identity Platform tier
- Per-SMS phone-auth costs can climb quickly for high-volume or international apps, and have been targets of SMS-pumping abuse
- Support is thin on the free tier; edge cases outside the docs can be hard to resolve