COMPARE
Speakeasy generates SDKs and MCP servers from your OpenAPI spec. StateAnchor gates every spec change to ensure those SDKs never break. The two tools work together — not against each other.
Speakeasy builds your MCP server. StateAnchor ensures it never drifts.
CAPABILITIES
Most teams use both. Speakeasy for generation. StateAnchor for enforcement.
THE CORE DISTINCTION
“Did my spec change produce correct SDK output?”
“Is this spec change safe to ship to consumers?”
These are different questions. One is about generation quality. The other is about contract safety. Both matter.
Speakeasy’s contract testing asks whether your schema still generates a valid SDK. StateAnchor asks whether the change is safe to ship to all consumers — even ones not captured by SDK compilation. A schema can pass contract testing while still containing a consumer-breaking change (a field removed, a type tightened, a required parameter added to an existing endpoint).
FEATURE COMPARISON
An honest, row-by-row comparison. Speakeasy is an excellent tool — the comparison below is factual, not dismissive. Check speakeasy.com for the latest on their capabilities.
| Capability | Speakeasy | StateAnchor |
|---|---|---|
| SDK & MCP artifact generation | TypeScript, Python, Go, Java, C#, PHP, Ruby, Kotlin, Unity, Terraform + MCP server | TypeScript, Python, Go SDKs + MCP server |
| Contract testing via GitHub Actions | Yes -- verifies your schema still generates a valid SDK on every PR (shipped Jan-Feb 2026) | Gate engine evaluates every spec change for consumer safety, not SDK-generation validity |
| Breaking-change gate (ERR / WARN / INFO lanes) | Linting and validation; contract testing is SDK-generation-centric, not spec-governance-centric | Categorical gate -- ERR always blocks, WARN threshold-based, INFO always passes |
| Drift audit trail | Check speakeasy.com for current capabilities | Append-only Merkle audit log (RFC 6962) -- every gate decision permanently recorded and cryptographically verifiable |
| CI enforcement mode | CI integration for generation pipeline; contract testing verifies SDK compilation | Gate runs on every push; ERR verdict fails the CI check before merge |
| Works alongside the other tool | Yes -- designed to work with contract enforcers like StateAnchor upstream | Yes -- designed to work with SDK generators like Speakeasy downstream. Gate-only mode produces zero artifact conflict. |
WORKING TOGETHER
If you’re generating MCP servers or SDKs with Speakeasy and shipping them to agents or consumers, StateAnchor’s gate catches the changes that would break them before they reach CI. Your Speakeasy workflow stays unchanged — StateAnchor runs on your OpenAPI spec one step upstream.
The gate blocks breaking changes before Speakeasy regenerates. That means your generated SDKs and MCP servers always reflect a spec that passed the safety check. You get generation quality (Speakeasy) and contract safety (StateAnchor) in a single pipeline.
Connect your first repo →Already using Speakeasy?
Gate-only mode sits on top of Speakeasy’s SDK generation — same output, with contract enforcement added. StateAnchor gates the spec before Speakeasy runs. Your generated MCP servers and SDKs continue to build from specs that have passed the safety check. No conflict, no duplication.
Speakeasy handles generation and SDK contract testing. StateAnchor handles consumer safety enforcement. Not a replacement — the governance layer Speakeasy doesn’t ship.
Connect a repo in ~=5 minutes. The gate runs on every push automatically.
Connect a repo →Free to start. No credit card required.