Authentication and user management · Comparison
Auth0 vs Firebase Authentication
2 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.
Side by side
| Metric | Auth0 | Firebase Authentication |
|---|---|---|
| What you're paying for | Compliance includedAudited enterprise identity — SOC 2 Type 2, ISO 27001 and six hosting regions — with a free plan of 25,000 users and one enterprise connection. | Worth the priceSign-in that plugs into Firebase and Google Cloud, free to 50,000 monthly users, with SAML at $0.015 per user and a self-serve Google Cloud BAA. |
| Overall score | 6.8 | 8.4Best |
| Free option | Free plan | Free plan |
| Card to start | No card needed | No card needed |
| Getting access | Self-serve | Self-serve |
| Starter priceCheapest paid plan | $35/mo | $0.0055/MAU above 50,000 |
| Pricing model | Tiered | Usage-based |
| Pricing page | Public prices | Public prices |
| Free plan | 25,000 MAU, no card to sign up | 50,000 MAU; Spark capped at 3,000 a day |
| Entry paid plan at 10,000 users | $700/mo (B2C Essentials) | $0 (Blaze), 50,000 MAU at no cost |
| Enterprise SSO | 1 connection free; 3 on B2B Essentials, more from $100/mo each | 50 SAML/OIDC users free on Blaze, then $0.015 each |
| SOC 2 report | Type 2, from the Support Center | SOC 2 (Google), via Compliance Reports Manager |
| HIPAA BAA | With an Enterprise subscription | Google Cloud BAA, accepted in the console |
| Data region | AU, CA, EU, JP, UK or US per tenant | US only |
| Log retention on the entry paid plan | 5 days (Essentials) | 30 days in Cloud Logging (activity logs, opt-in) |
| Bottom line | From its public pages, Auth0 is the most complete compliance and data-region package of the three, with a generous free plan. Its paid plans cost more per user than the others, so price the B2C or B2B plan at your user count first. | From its public pages, Firebase Authentication is the least expensive route here to SAML SSO and a self-serve BAA, inside the Firebase platform. Check US-only processing and the protections it does not list. |
Evidence: Auth0: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Firebase Authentication: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.
Entry price
Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.
- Auth0Essentials (B2C)$35/mo500 MAU; $700 at 10,000, $2,100 at 30,000
- Pro MFA (OTP, Duo)
- 5-day log retention
- Standard support
- Firebase AuthenticationBlaze$0.0055/MAUAfter 50,000 free MAU; $0.0046 from 100,000, $0.0032 from 1M, $0.0025 from 10M
- SAML/OIDC: 50 MAU free, then $0.015 each
- Phone sign-in and SMS MFA billed per SMS ($0.01 in the US)
- First 10 SMS a day not billed
- Identity Platform SLA
Prices as listed on each pricing page, in USD per month, excluding tax. Observed: Auth0 2026-10-15, Firebase Authentication 2026-10-15.
Which one fits
- If you need to start today without a sales call
- Firebase AuthenticationSelf-serve sign-up, no card needed; the highest score of the 2 self-serve products here (8.4/10).
- If you want to try it without entering a card
- Firebase AuthenticationFree plan, no card needed, and the highest score of the 2 that skip the card (8.4/10).
- Lowest starter price
- Auth0$35/mo for the Essentials plan. Firebase Authentication lists no comparable paid price.
- Highest overall score
- Firebase Authentication8.4/10 (Excellent). The review shows the score breakdown and the run behind it.
Picked by fixed rules from the table above, not by hand. How we score
Full reviews
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