Auth & Backend · side by side
Better Auth vs Firebase Auth
Compare Better Auth, Firebase Auth by active-user allowances, social login, MFA, SSO, organizations and audit logs.
Auth & Backend pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Better Auth
1
Firebase Auth
25K
Better Auth
Custom / not listed
Custom / unlisted usage pricing · 1 servers
Firebase Auth
$0 / mo
Spark plan · 25K MAUs
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Auth & Backend overview & pricing
| Auth & Backend | Better Auth | Firebase Auth |
|---|---|---|
| Provider | Open source | |
| Billing unit | servers | MAUs |
| Plan at selected usage | Custom / unlisted usage pricing | Spark plan |
| Monthly estimate | Custom / not listed | $0/mo |
| Workload | 1 servers | 25K MAUs |
| Free access | Free, open source | 50,000 MAUs |
| Published plans | Starter, Pro, Enterprise | Spark plan, Blaze plan |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Better Auth
- Open source
- Firebase Auth
Billing unit
- Better Auth
- servers
- Firebase Auth
- MAUs
Plan at selected usage
- Better Auth
- Custom / unlisted usage pricing
- Firebase Auth
- Spark plan
Monthly estimate
- Better Auth
- Custom / not listed
- Firebase Auth
- $0/mo
Workload
- Better Auth
- 1 servers
- Firebase Auth
- 25K MAUs
Free access
- Better Auth
- Free, open source
- Firebase Auth
- 50,000 MAUs
Published plans
- Better Auth
- Starter, Pro, Enterprise
- Firebase Auth
- Spark plan, Blaze plan
Prices checked
- Better Auth
- 2026-10-08
- Firebase Auth
- 2026-10-08
Auth & Backend monthly cost
Better Auth: Not pricedFirebase Auth: $0
Different workloads, separate estimates
Check how each provider defines an active user and separates consumer identity from enterprise organizations. SAML, MFA, custom domains and audit logs can be gated behind higher plans. A backend platform can also charge separately for storage, functions and traffic.
Auth & Backend feature comparison
| Auth & Backend | Better Auth | Firebase Auth |
|---|---|---|
| A/B Testing | Not listed | No-cost |
| Analytics | Not listed | No-cost |
| App Check | Not listed | No-cost, subject to quotas and limits |
| App Distribution | Not listed | No-cost |
| App Hosting - Outgoing bandwidth (Uncached) | Not listed | Not applicable |
| App Hosting - Outgoing bandwidth (Cached) | Not listed | Not applicable |
| App Hosting - Storage | Not listed | Not applicable |
| Authentication - Phone Auth | Not listed | Not applicable |
| Authentication - Monthly active users | Not listed | 50K MAUs |
| Authentication - Monthly active users (SAML/OIDC) | Not listed | 50 MAUs |
| Cloud Firestore - Stored data (Standard) | Not listed | 1 GiB total |
| Cloud Firestore - Network egress (Standard) | Not listed | 10 GiB/month |
| Cloud Firestore - Document writes (Standard) | Not listed | 20K writes/day |
| Cloud Firestore - Document reads (Standard) | Not listed | 50K reads/day |
| Cloud Firestore - Document deletes (Standard) | Not listed | 20K deletes/day |
| Cloud Functions - Invocations | Not listed | Not applicable |
| Cloud Functions - Outbound networking | Not listed | Not applicable |
| Cloud Functions - Cloud Build minutes | Not listed | Not applicable |
| Cloud Messaging (FCM) | Not listed | No-cost |
| Crashlytics | Not listed | No-cost |
| Hosting - Storage | Not listed | 10 GB |
| Hosting - Data transfer | Not listed | 360 MB/day |
| Hosting - Custom domain & SSL | Not listed | |
| Hosting - Multiple sites per project | Not listed | |
| In-App Messaging | Not listed | No-cost |
| Performance Monitoring | Not listed | No-cost |
| Realtime Database - Simultaneous connections | Not listed | 100 |
| Realtime Database - Stored data | Not listed | 1 GB |
| Realtime Database - Data downloaded | Not listed | 10 GB/month |
| Realtime Database - Multiple databases per project | Not listed | |
| Remote Config - Fetch Requests | Not listed | Up to 100,000 per day per project |
| Test Lab - Virtual Device Tests | Not listed | 10 tests/day |
| Test Lab - Physical Device Tests | Not listed | 5 tests/day |
| Test Lab - Android Device Streaming | Not listed | 30 no-cost minutes per project, per month |
| Google Cloud BigQuery | Not listed | Yes (Sandbox limits) |
| Google Cloud Other IaaS | Not listed | |
| Gemini in Firebase | Not listed | No-cost |
| Firebase Studio | Not listed | No-cost for 3 workspaces |
A/B Testing
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Analytics
- Better Auth
- Not listed
- Firebase Auth
- No-cost
App Check
- Better Auth
- Not listed
- Firebase Auth
- No-cost, subject to quotas and limits
App Distribution
- Better Auth
- Not listed
- Firebase Auth
- No-cost
App Hosting - Outgoing bandwidth (Uncached)
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
App Hosting - Outgoing bandwidth (Cached)
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
App Hosting - Storage
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
Authentication - Phone Auth
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
Authentication - Monthly active users
- Better Auth
- Not listed
- Firebase Auth
- 50K MAUs
Authentication - Monthly active users (SAML/OIDC)
- Better Auth
- Not listed
- Firebase Auth
- 50 MAUs
Cloud Firestore - Stored data (Standard)
- Better Auth
- Not listed
- Firebase Auth
- 1 GiB total
Cloud Firestore - Network egress (Standard)
- Better Auth
- Not listed
- Firebase Auth
- 10 GiB/month
Cloud Firestore - Document writes (Standard)
- Better Auth
- Not listed
- Firebase Auth
- 20K writes/day
Cloud Firestore - Document reads (Standard)
- Better Auth
- Not listed
- Firebase Auth
- 50K reads/day
Cloud Firestore - Document deletes (Standard)
- Better Auth
- Not listed
- Firebase Auth
- 20K deletes/day
Cloud Functions - Invocations
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
Cloud Functions - Outbound networking
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
Cloud Functions - Cloud Build minutes
- Better Auth
- Not listed
- Firebase Auth
- Not applicable
Cloud Messaging (FCM)
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Crashlytics
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Hosting - Storage
- Better Auth
- Not listed
- Firebase Auth
- 10 GB
Hosting - Data transfer
- Better Auth
- Not listed
- Firebase Auth
- 360 MB/day
Hosting - Custom domain & SSL
- Better Auth
- Not listed
- Firebase Auth
Hosting - Multiple sites per project
- Better Auth
- Not listed
- Firebase Auth
In-App Messaging
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Performance Monitoring
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Realtime Database - Simultaneous connections
- Better Auth
- Not listed
- Firebase Auth
- 100
Realtime Database - Stored data
- Better Auth
- Not listed
- Firebase Auth
- 1 GB
Realtime Database - Data downloaded
- Better Auth
- Not listed
- Firebase Auth
- 10 GB/month
Realtime Database - Multiple databases per project
- Better Auth
- Not listed
- Firebase Auth
Remote Config - Fetch Requests
- Better Auth
- Not listed
- Firebase Auth
- Up to 100,000 per day per project
Test Lab - Virtual Device Tests
- Better Auth
- Not listed
- Firebase Auth
- 10 tests/day
Test Lab - Physical Device Tests
- Better Auth
- Not listed
- Firebase Auth
- 5 tests/day
Test Lab - Android Device Streaming
- Better Auth
- Not listed
- Firebase Auth
- 30 no-cost minutes per project, per month
Google Cloud BigQuery
- Better Auth
- Not listed
- Firebase Auth
- Yes (Sandbox limits)
Google Cloud Other IaaS
- Better Auth
- Not listed
- Firebase Auth
Gemini in Firebase
- Better Auth
- Not listed
- Firebase Auth
- No-cost
Firebase Studio
- Better Auth
- Not listed
- Firebase Auth
- No-cost for 3 workspaces
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Which authentication & backend providers fit your needs?
Firebase Auth features & plan notes
- Google ecosystem
- Phone auth
- Generous no-cost usage limits
- No payment method needed
- Authentication: 50K MAUs (50 MAUs for SAML/OIDC)
- Cloud Firestore: 1 GiB total stored data, 10 GiB/month network egress, 20K writes/day, 50K reads/day, 20K deletes/day
- Hosting: 10 GB storage, 360 MB/day data transfer, custom domain & SSL, multiple sites per project
- Realtime Database: 100 simultaneous connections, 1 GB stored, 10 GB/month downloaded
- Remote Config: Up to 100,000 fetch requests per day per project
- Test Lab: 10 virtual device tests/day, 5 physical device tests/day, 30 no-cost Android device streaming min/month
- SQL Connect: 3-month no-cost trial (limit 1 Cloud SQL instance per project)
- Firebase Studio: No-cost for three workspaces
- No-cost products included: A/B Testing, Analytics, App Check, App Distribution, Cloud Messaging (FCM), Crashlytics, In-App Messaging, Performance Monitoring
How to compare authentication & backend providers
Check how each provider defines an active user and separates consumer identity from enterprise organizations. SAML, MFA, custom domains and audit logs can be gated behind higher plans. A backend platform can also charge separately for storage, functions and traffic.
Browse Auth & Backend pricing