compare_providers
Supabase vs Firebase: open contracts against a polished SDK
Firebase edges Supabase on the Kin Score (46.1 to 42.8), but Supabase is more than three times as agent-ready.
Firebase
Firebase scores 46.1 and Supabase 42.8, both developing. The two scores rest on very different foundations.
Firebase scores 0 on both contract quality and contract governance, because the catalog finds no OpenAPI for it. Firebase is reached through SDKs, not a published HTTP contract. Its points come from discoverability (76.7), developer ergonomics (78.6), access clarity (60.5) and operational transparency (52.6). Supabase publishes OpenAPI, AsyncAPI, Spectral rules, plans, rate limits, FinOps, agentic access and agent skills. None of those appear for Firebase.
That is why Supabase is far more agent-ready: 48.1 against 14.2. An agent can read Supabase’s contracts. With Firebase it has to work through an SDK. Firebase wins the composite on polish. Supabase is the one an agent can use.
Facet by facet
The six Kin Score facets, 0 to 100. The facet leader is the one the tool names in facet_leaders. Each facet links to how it is measured.
| Facet | Supabase | Firebase | Leader |
|---|---|---|---|
| Discoverability | 65 | 76.7 | Firebase |
| Contract Quality | 63.2 | 0 | Supabase |
| Contract Governance | 13.6 | 0 | Supabase |
| Operational Transparency | 36.8 | 52.6 | Firebase |
| Developer Ergonomics | 32.6 | 78.6 | Firebase |
| Access Clarity | 26.3 | 60.5 | Firebase |
| Kin Score | 42.8 | 46.1 | Firebase |
| Agent readiness | 48.1 agent-ready | 14.2 agent-aware | Supabase |
Artifact coverage
Every artifact type either provider publishes, from the tool's artifact_matrix. Differences are listed first.
| Artifact | Supabase | Firebase |
|---|---|---|
| AgentSkill | ✓ | — |
| AgenticAccess | ✓ | — |
| AsyncAPI | ✓ | — |
| FinOps | ✓ | — |
| OpenAPI | ✓ | — |
| Plans | ✓ | — |
| RateLimits | ✓ | — |
| Rules | ✓ | — |
| Scopes | — | ✓ |
| APIsJSON | ✓ | ✓ |
| Documentation | ✓ | ✓ |
| MCP | ✓ | ✓ |
| Security | ✓ | ✓ |
What it costs to get in
Each provider's economics as the tool returns them. Grade A is quoted on the provider's own pricing page, B is arithmetic on quotes, C a stated prior. Entry cost is the cheapest published paid tier — a floor on getting in, not the price of the API alone. Grades: A quoted on the provider's page, B arithmetic on quotes, C a stated prior.
| Supabase | Firebase | |
|---|---|---|
| Audience | — | — |
| Pricing basis | — | — |
| Delivery | — | — |
| Entry (per month) | not published | not published |
| Marginal cost | — | — |
| Take rate | — | — |
| Source | — | — |
Cheapest published way in: neither publishes one. Priced 0 of 2.
The full compare_providers response
{"providers":[{"slug":"supabase","name":"Supabase","band":"developing","composite":42.8,"trend":"flat","delta":1.4,"api_count":21,"api_count_basis":"split","artifact_types":["MCP","AgentSkills","Security","Rules","Plans","RateLimits","FinOps","AgenticAccess","Documentation","AsyncAPI","APIsJSON","OpenAPI"],"industries":["cybersecurity","data-analytics","developer-tools"],"regions":[],"facets":{"discoverability":65,"contract_quality":63.2,"contract_governance":13.6,"operational_transparency":36.8,"developer_ergonomics":32.6,"access_clarity":26.3},"facet_gap":{"discoverability":11.7,"contract_quality":0,"contract_governance":0,"operational_transparency":15.8,"developer_ergonomics":46,"access_clarity":34.2},"agent_readiness":{"score":48.1,"band":"agent-ready"},"economics":null},{"slug":"firebase","name":"Firebase","band":"developing","composite":46.1,"trend":"flat","delta":0,"api_count":4,"api_count_basis":"split","artifact_types":["MCP","Security","Scopes","APIReference","APIsJSON"],"industries":["cybersecurity","data-analytics","telecommunications"],"regions":[],"facets":{"discoverability":76.7,"contract_quality":0,"contract_governance":0,"operational_transparency":52.6,"developer_ergonomics":78.6,"access_clarity":60.5},"facet_gap":{"discoverability":0,"contract_quality":63.2,"contract_governance":13.6,"operational_transparency":0,"developer_ergonomics":0,"access_clarity":0},"agent_readiness":{"score":14.2,"band":"agent-aware"},"economics":null}],"artifact_union":["APIsJSON","AgentSkill","AgenticAccess","AsyncAPI","Documentation","FinOps","MCP","OpenAPI","Plans","RateLimits","Rules","Scopes","Security"],"artifact_matrix":{"APIsJSON":{"supabase":true,"firebase":true},"AgentSkill":{"supabase":true,"firebase":false},"AgenticAccess":{"supabase":true,"firebase":false},"AsyncAPI":{"supabase":true,"firebase":false},"Documentation":{"supabase":true,"firebase":true},"FinOps":{"supabase":true,"firebase":false},"MCP":{"supabase":true,"firebase":true},"OpenAPI":{"supabase":true,"firebase":false},"Plans":{"supabase":true,"firebase":false},"RateLimits":{"supabase":true,"firebase":false},"Rules":{"supabase":true,"firebase":false},"Scopes":{"supabase":false,"firebase":true},"Security":{"supabase":true,"firebase":true}},"facet_leaders":{"discoverability":{"provider":"firebase","score":76.7},"contract_quality":{"provider":"supabase","score":63.2},"contract_governance":{"provider":"supabase","score":13.6},"operational_transparency":{"provider":"firebase","score":52.6},"developer_ergonomics":{"provider":"firebase","score":78.6},"access_clarity":{"provider":"firebase","score":60.5}},"best_overall":"firebase","cheapest_entry":null,"economics_basis":{"stamp_generated":"2026-10-17","priced":0,"of":2,"note":"Entry cost is the cheapest published paid tier — a floor on getting in, not the price of the API alone. Grades: A quoted on the provider's page, B arithmetic on quotes, C a stated prior."},"unknown":[]}Result read 2026-10-27. Scores move as providers publish; run it yourself for today's numbers.
Run this comparison yourself
Everything above came from one call to compare_providers. Swap in any two of the catalog's providers (three or more works too) and you get the same answer for your own shortlist. It is an Understanding tool, included in the Understanding and Influence plans, or pay per call.
https://apis.io/mcp:
{"name": "compare_providers", "arguments": {"providers": ["supabase","firebase"]}}curl "https://apis.io/api/v1/compare?providers=supabase,firebase" \
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