Comparison
Swagger describes your API. Elva runs it.
A spec and a viewer are where API management starts, not where it ends. Elva writes the spec from your code, scores it, enforces one contract per audience, and hosts the gateway your agents call.
Written by the Elva team. Swagger and SwaggerHub are trademarks of SmartBear Software and are not affiliated with Elva. Elva speaks OpenAPI natively.
SwaggerSPEC AND TOOLING
The format most of the industry writes APIs in, plus an editor, a viewer, and code generators. It renders the spec you hand it faithfully, and has no opinion on whether that spec still matches production.Starts from a spec you maintainFree open source, per seat on SwaggerHubStyle rules, not runtime enforcement
ElvaAPI MANAGEMENT
A system of record that reads your repo, writes the specs, scores every endpoint, and enforces one contract per audience at runtime. Collections are an output, not the input.Starts from the code, rescanned every commitFlat pricing, unlimited members and endpointsGovernance blocks the publish
Four real differences
The gaps that matter once agents show up
01Someone has to write the spec. Elva does
OpenAPI is an excellent format for describing an API. It has nothing to say about who keeps the description true.SWAGGERThe spec is an artifact you own and maintain. When the code moves and the file does not, the viewer confidently shows the wrong thing.
ELVAElva reads routes, handlers, and types from the repo, writes OpenAPI 3.1 itself, and rescans on every commit. The document cannot fall behind the code.
02A grade and a fix, not a rendered document
A spec can be valid, lint-clean, and still unusable by an agent: no descriptions, loose types, undocumented auth.SWAGGERStyle rules and validation catch structural problems. Whether an endpoint is genuinely ready for a partner or an agent is a judgment call.
ELVAEvery endpoint is graded on design, developer experience, AI readiness, security, and performance, with a concrete fix attached and an AI that can apply it.
03Governance that can say no
A diff between two spec versions tells you what changed. It does not tell you whose build breaks, or stop it from shipping.SWAGGERValidation and version history exist, and CI can fail a lint. Consumer impact and approval are up to your own process.
ELVAContracts define what each audience sees per field. Breaking changes block the publish until approved, and the gateway enforces the same rules at runtime.
04From a document to a running gateway
Agents do not read documentation. They call tools, retry badly, and act on whatever schema you hand them.SWAGGERA spec can describe an API. It cannot authenticate a call, hide a field, throttle a retry storm, or tell you which agent did what.
ELVAHosted MCP servers with OAuth2, per-tool scopes, field redaction, rate limits, and a full log of which agent called which tool, in one place.
Side by side, capability by capability
Swagger
DISCOVER
Generate specs from source codePartial
Rescan on every commitNo
Finds undocumented endpointsNo
Import OpenAPI and collections✓
Consumption tracing per endpointNo
Unused endpoint detectionNo
UNDERSTAND
Endpoint-level quality scoringStyle rules
AI readiness scoreNo
AI fixes applied to the specNo
Score history and trendsNo
Manual request testingTry it out
Automated test generationNo
Chaos suites for agent behaviorNo
GOVERN
Auto changelog from codeNo
Contracts per audienceNo
Field-level exposure controlNo
Block-publish on breaking changePartial
Approval workflowsPartial
Runtime enforcement of the contractNo
PUBLISH
Docs site✓
Collection exportPartial
Client SDK generation✓
MCP server generationNo
Hosted MCP with auth gatewayNo
Per-tool scopes and rate limitsNo
Per-agent and per-key call logsNo
COMMERCIALS
Pricing modelPer seat
Members includedPaid per user
Endpoint limitsAPI count
Free tierOpen source
SSO / SAML, audit logsEnterprise
On-prem deployment✓
Elva
DISCOVER
Generate specs from source code✓
Rescan on every commit✓
Finds undocumented endpoints✓
Import OpenAPI and collections✓
Consumption tracing per endpoint✓
Unused endpoint detection✓
UNDERSTAND
Endpoint-level quality scoring✓
AI readiness score✓
AI fixes applied to the spec✓
Score history and trends✓
Manual request testing✓
Automated test generation✓
Chaos suites for agent behavior✓
GOVERN
Auto changelog from code✓
Contracts per audience✓
Field-level exposure control✓
Block-publish on breaking change✓
Approval workflows✓
Runtime enforcement of the contract✓
PUBLISH
Docs site✓
Collection export✓
Client SDK generation✓
MCP server generation✓
Hosted MCP with auth gateway✓
Per-tool scopes and rate limits✓
Per-agent and per-key call logs✓
COMMERCIALS
Pricing modelFlat per workspace
Members includedUnlimited
Endpoint limitsUnlimited
Free tierYes, 1 repo
SSO / SAML, audit logsEnterprise
On-prem deploymentEnterprise
Compiled from public product documentation in July 2026. The OpenAPI toolchain moves fast, so check the current docs. If something here is out of date, tell us and we will fix it.
Switching
You do not have to throw anything away
Import the specs you already have, keep the toolchain your consumers rely on, and let Elva reconcile the document against the code. The gap is usually the point.
01Import collections and specsOpenAPI and Swagger files, whatever version, plus Postman collections and environments. Everything lands in the catalog with its history intact.
02Connect the repoThis is where the gap shows. Expect to find endpoints no collection ever mentioned, usually a third of your surface.
03Export back out any timeElva emits standard OpenAPI 3.1, so Swagger UI, your codegen, and any tool that reads a spec keep working exactly as they do today.
WHEN SWAGGER IS ENOUGHYou need a readable reference for an API whose spec is already accurate, and a viewer your consumers can open. Swagger UI is the industry default for a reason, and Elva emits the same OpenAPI you would put in it.
WHEN YOU NEED ELVANobody can list every endpoint you own. A partner or an agent depends on your response shape. Someone asks which agent called what, and the honest answer is that you do not know. That is the day a client stops being enough.
FAQ
Do I need an OpenAPI spec to use Elva?
No. Elva writes the spec from your code and rescans on every commit, so the spec is an output that cannot drift instead of an input someone must maintain.
Does Elva work with the OpenAPI files I already have?
Yes. Existing specs import into the catalog, and from then on they are checked against the code, with drift flagged the moment the two disagree.
What does Elva add beyond Swagger UI?
Endpoint scoring, one enforced contract per audience with breaking-change gates, generated tests, and hosted MCP servers behind an auth gateway. A spec and a viewer are where that pipeline starts, not where it ends.
Point Elva at one repo and see what is missing
Free forever on your first repo. Import your existing specs in the same minute.