Firebase Pricing 2026: Spark vs Blaze & Firestore Costs

Current Firebase Pricing (September 2026)

Plan	Monthly Cost	Realtime DB	Firestore	Hosting
Spark (Free)	$0	1 GB stored, 10 GB downloads/month	1 GiB, 50K reads/day, 20K writes/day	10 GB storage, 360 MB transfer/day
Blaze	Pay-as-you-go	Unlimited	Unlimited	Unlimited
Enterprise	Custom	Custom	Custom	Custom

Blaze Plan Usage-Based Pricing

Firestore Operations

Reads per 100,000 $0.06

Writes per 100,000 $0.18

Deletes per 100,000 $0.18

Storage

Firestore storage per GB/month $0.18

Realtime Database per GB/month $5.00

Hosting storage per GB $0.026

Other Services

Cloud Functions invocation per million $0.40

Hosting bandwidth per GB $0.15

Authentication users (first 1M free) Free

Cost Estimation Examples

These examples use representative US multi-region Firestore rates and the public Firebase rates shown above. Firestore operation and storage prices vary by location, so use Google Cloud's calculator before approving a production budget.

Scenario 1: Small Mobile App (100,000 daily users)

Firestore reads (3M/month) $1.80

Firestore writes (500K/month) $0.90

Firestore storage (5 GB) $0.90

Hosting bandwidth (50 GB/month) $6.00

Total ~$10/month

Scenario 2: Medium Web App (1M daily users)

Firestore reads (50M/month) $30.00

Firestore writes (5M/month) $9.00

Firestore storage (50 GB) $9.00

Cloud Functions (10M calls/month) $4.00

Hosting bandwidth (500 GB/month) $60.00

Total ~$112/month

Scenario 3: Realtime Database-heavy app

Stored data above free quota (9 GB)$45.00

Downloads above free quota (90 GB)$90.00

Database subtotal$135/month

This is where the corrected $5/GB storage rate matters. Realtime Database bills stored data and downloaded data separately.

What Firebase Bills Separately

Firestore: document and index-entry reads, writes, deletes, stored data and network egress. Only one database per project receives the free quota.
Realtime Database: stored data and downloads, including protocol and encryption overhead.
Cloud Functions: invocations, compute time, outbound networking, builds and container storage after their individual allowances.
Hosting and Storage: storage and transfer are separate meters. Hosting currently includes 10 GB storage and 360 MB transfer per day before paid usage.
Authentication: most core authentication is free, but phone verification and Identity Platform usage can generate separate charges.

Free-to-Paid Thresholds and Cost Controls

Blaze retains eligible no-cost allowances, but enabling billing also unlocks services that can spend beyond those limits. Set a Google Cloud budget alert before launch, monitor Firestore reads caused by listeners and security-rule lookups, and review egress separately from storage.

Budget alerts notify you but do not automatically cap spending. If you implement an automated billing shutdown, Google warns that disabling billing can interrupt the application and may delete some resources. Use application-level quotas, rate limits and dashboards as the safer first line of control.

Primary sources checked September 29, 2026: Firebase pricing, Realtime Database billing, and Firestore billing.

Firebase vs Alternatives

vs Supabase: Firebase is fully managed; Supabase is PostgreSQL-based alternative. Firebase has broader ecosystem (Auth, Hosting, Functions), Supabase is cheaper for large databases.
vs MongoDB Atlas: Firebase is real-time optimized; MongoDB is document database optimized. Firebase better for mobile/web apps, MongoDB better for complex queries.
vs AWS DynamoDB: Firebase is simpler, better real-time. DynamoDB is AWS ecosystem, complex configuration.

When to Upgrade from Spark

Upgrade to Blaze (pay-as-you-go) when:

Your database exceeds 100 MB (Realtime) or 1 GB (Firestore)
You're running production applications with real traffic
You need unlimited storage and operations
You want to use Cloud Functions or advanced features

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