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Firebase Realtime Database

firebase.google.com/products/realtime-databasePaaSstorage/firebase-realtime-databaseJSON compare report an error provider JSON

Free allowance: 1 GB stored on the Spark (no-cost) plan; 10 GB/month downloaded (~360 MB/day)
Verdict: fails: egressdata cannot be read back out at a usable rate or price
Cost: free tier
Identity: email?placeholder, not evidence; card unknown, phone unknown
Binding limit: per-ip-shaping100 simultaneous connections
Evidence: reported2 sources; a third party said so
Freshness: stale on 2026-11-05checked 2026-10-21 (inherited); stale on 2026-11-05

Free tier	1 GB stored on the Spark (no-cost) plan; 10 GB/month downloaded (~360 MB/day) unit GB; metered on stored-bytes
Price	none stated
Limits	per-ip-shaping (binding) 100 simultaneous connections source 1 GB stored; 10 MB max string (so ~7.5 MB of binary as base64); 256 MB max response per read; 32 levels max depth; 768 byte key length; 1,000 writes/sec per DB; 100 simultaneous connections on Spark; 10 GB/month download
Binding	per-ip-shaping one stream is shaped, and a user's throughput is the shaped rate times the number of streams
Identity	email (placeholder) not published
Egress	Metered on Blaze at $1/GB, with 'No-cost up to 360 MB/day (equivalent to ~10 GB/month)' on Spark. 360 MB/day vs 500 GB/day = 1,400x short. free allowance: 10 GB per month
Per-object cap	not stated
Retention	not stated
Interface	rest, cli rest
Tooling	Firebase SDKs, REST API (`PUT/PATCH/GET .json`), Admin SDK, `firebase-tools` CLI; data is a JSON tree
Composes with	1 GB per database instance; multiple instances are possible via sharding, but the Spark plan limits you to a small number of instances and each shares the project's 10 GB/month download. 500 GB would need 500 projects.
Reliability	Durable and simple, but base64 in JSON costs +33% and the 10 MB per-string cap means chunking into ~7.5 MB pieces. The 100-connection Spark limit and 360 MB/day download cap both bind hard.

Evidence 2

date	source	what it proved
2026-10-21	firebase.google.com/pricing	'Realtime Database \| GB stored 1 GB (no-cost)'; 'GB downloaded 10 GB/month (no-cost)'; 'No-cost up to 360 MB/day (equivalent to ~10 GB/month) Then $1/GB'
2026-10-21	firebase.google.com/docs/database/usage/limits	'Maximum size of a string \| 10 MB'; 'Size of a single response served by the database \| 256 MB'; 'Maximum depth of child nodes \| 32'; 'Write rate \| 1,000 writes/second'; 'The Spark plan limit on simultaneous connections is 100'

More fields 1

{
 "dead_end": {
  "failure_class": "quota",
  "why": "1 GB stored on the Spark (no-cost) plan; 10 GB/month downloaded (~360 MB/day)",
  "retry_when": null,
  "first_recorded": "2026-10-21"
 }
}

Unknown values 4

$.per_object_cap.notes the field may be stated in a source that was not read
$.per_object_cap.stated the field may be stated in a source that was not read
$.retention.notes the field may be stated in a source that was not read
$.retention.stated the field may be stated in a source that was not read