Auth0 vs Firebase Authentication: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Auth0 and Firebase Authentication side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Auth0
Identity platform for developers
Best for you if:
- • You want easy integration
Firebase Authentication
Backend authentication by Google
Best for you if:
- • You want easy to implement
| At a Glance | Auth0 | Firebase Authentication |
|---|---|---|
Starts at | Free plan, paid from $35/mo, billed monthly Essentials plan | Free plan |
Category | Identity & Access Security | Identity & Access Developer Tools |
Rating | 4.5/5 G2 4.3 · Capterra 4.7 424 reviews | 4.9/5 G2 4.9 5 reviews |
Free plan | Yes | Yes |
Watch out for | Overage pricing at $0.07/MAU applies per user beyond the base limit. | Phone verification costs $0.01-$0.06 each. |
Choose Auth0 or Firebase Authentication?
Choose Auth0 if
- You want easy integration
- You want many features
Choose Firebase Authentication if
- You want easy to implement
- You want multiple auth methods
In-Depth Analysis
Auth0
Identity platform for developers
Auth0's free tier at 25,000 MAUs is the most generous in the identity space, far ahead of Firebase Auth (free at 50K MAUs but with fewer features) and Clerk (500 MAUs free).
Watch out
Overage pricing at $0.07/MAU applies per user beyond the base limit.
Strengths
- Pro: Easy integration
- Pro: Many features
- Pro: Great docs
Weaknesses
- Con: Expensive at scale
- Con: Complex pricing
Key features
Firebase Authentication
Backend authentication by Google
Firebase Authentication's Spark plan is incredibly generous, offering 50,000 MAU for free, which is far more than many competitors.
Watch out
Phone verification costs $0.01-$0.06 each.
Strengths
- Pro: Easy to implement
- Pro: Multiple auth methods
- Pro: Free generous tier
- Pro: Good security
Weaknesses
- Con: Vendor lock-in
- Con: Limited customization
- Con: Part of Google ecosystem
Key features
Plans and prices: Auth0 vs Firebase Authentication
| Tool | Plans and prices | Source |
|---|---|---|
| Auth0 |
| auth0.com/pricing read Oct 31, 2026 |
| Firebase Authentication |
| firebase.google.com/products/auth read Oct 5, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Auth0 pricing and Firebase Authentication pricing.
Key Takeaways
Auth0
- Choose if you want identity platform for developers
Firebase Authentication
- Choose if you want backend authentication by Google
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- User ratings rest on too few reviews to rank (4.5/5 from 424 reviews for Auth0, 4.9/5 from 5 reviews for Firebase Authentication; we compare ratings only above 20 reviews on both sides).
- Auth0 starts at $35/mo, billed monthly; Firebase Authentication has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Auth0 and Firebase Authentication compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. User ratings rest on too few reviews to rank (4.5/5 from 424 reviews for Auth0, 4.9/5 from 5 reviews for Firebase Authentication; we compare ratings only above 20 reviews on both sides). Auth0 starts at $35/mo, billed monthly; Firebase Authentication has no public paid plan price on file. Both have a free plan.
What are Auth0 and Firebase Authentication used for?
Auth0: Identity platform for developers. Firebase Authentication: Backend authentication by Google.
What does Auth0 cost vs Firebase Authentication?
Auth0's cheapest paid plan is Essentials at $35/mo, billed monthly; it also has a free plan. Firebase Authentication has no public paid-plan price on file. Prices read on the vendors' pricing pages, latest check Oct 31, 2026.
What's the main difference between Auth0 and Firebase Authentication?
Auth0's main strength: easy integration. Firebase Authentication's main strength: easy to implement.