A Swagger and SwaggerHub alternative
Swagger describes your API. Evlio runs it.
A spec and a viewer are where API management starts, not where it ends. Evlio writes the spec from your code, scores it, enforces one contract per audience, and hosts the gateway your agents call. Import your existing OpenAPI files; nothing is rewritten by hand.
Need an editor, not a platform? Open the free OpenAPI editor →
Written by the Evlio team. Postman, Swagger and SwaggerHub are trademarks of their respective owners. Evlio is not affiliated with or endorsed by them.
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
EvlioAPI 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. Evlio 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.
EVLIOEvlio 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.
EVLIOEvery 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.
EVLIOContracts 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.
EVLIOHosted 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✓
OpenAPI editorSwagger Editor, open source, local or hosted by SmartBear
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
Evlio
DISCOVER
Generate specs from source code✓
Rescan on every commit✓
Finds undocumented endpoints✓
Import OpenAPI and collections✓
OpenAPI editorFree editor at app.evlio.xyz/editor, plus specs generated from code
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✓
Capability rows 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.
What it costs, product by product
Swagger (open source)
PRICING AND PLANS
Pricing modelFree, open source
Members includedRuns on your machine
Free tierThe tools are free
API or design limitsNone
HostingYou host it
Team collaborationNo
SSO / SAMLNo
SwaggerHub
PRICING AND PLANS
Pricing modelPer user: from $19 Individual, $29 Team, $49 Enterprise a month
Members includedEach user is a paid seat
Free tierFree trial, no free plan
API or design limits10 APIs Individual, 50 Team, unlimited Enterprise
HostingSaaS, or on-premise on request
Team collaborationTeam plan and above
SSO / SAMLAdd-on at $5 per user/month, Team and above
Evlio
PRICING AND PLANS
Pricing model$0 Free · $100/mo Startup · $600/mo Business, flat
Members includedUnlimited on every plan
Free tier1 repo, 1 hosted MCP server, 1,000 tool calls/mo
API or design limitsUnlimited endpoints
HostingHosted; private cloud or on-prem on Enterprise
Team collaborationEvery plan
SSO / SAMLEnterprise
Swagger plans and prices checked on swagger.io/product/pricing. Evlio prices from our pricing page.
Switching
Switching from SwaggerHub
Bring the specs you already have and keep the toolchain your consumers rely on. Evlio emits standard OpenAPI 3.1, so Swagger UI and your codegen keep working exactly as they do today.
01ImportUpload your OpenAPI 2.0 or 3.x files, or connect the repo and let Evlio regenerate them from code. Expect the repo to surface endpoints no spec ever mentioned.
02DocsSpecs publish to documentation hosted by Evlio, the API documentation platform Evlio is built on.About Evlio →
03TeamEvery member is free on every plan. There is no per-user seat to migrate, and no one to leave out.
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 Evlio emits the same OpenAPI you would put in it.
WHEN YOU NEED EVLIONobody 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 Evlio?
No. Evlio 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 Evlio 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 Evlio 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.
- SOC 2 Type II · certified
- ISO 27001 / 27701 · certified
- GDPR · compliant
- Encryption · TLS 1.3 / AES-256
- SSO / SAML and SCIM · available
Point Evlio at one repo and see what is missing
Free forever on your first repo. Import your existing specs in the same minute.