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APIs · head to head

Swagger/OpenAPI vs Trustly

Swagger/OpenAPI logo

Swagger/OpenAPI

APIs

API specification and documentation framework using OpenAPI standard

From
Free
Rated
-
Full reviewWebsite
Trustly logo

Trustly

APIs

Pay-by-bank payments network, majority-owned by private equity firm Nordic Capital

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Swagger/OpenAPI has a free tier, so it costs nothing to try first.
  • Each has a real cost: Swagger/OpenAPI the OpenAPI Specification itself is licensed under Apache License 2.0 and free to use; SwaggerHub is a separate paid tool built on top of it; Trustly it is majority-owned by Nordic Capital, a private equity firm, so its long-term roadmap is ultimately oriented toward an eventual sale or IPO rather than indefinite independent operation.
  • They diverge on capability: Swagger/OpenAPI covers OpenAPI Specification, Trustly covers Pay by bank checkout.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Swagger/OpenAPI and Trustly actually diverge.

Attributes where Swagger/OpenAPI and Trustly differ
AttributeSwagger/OpenAPITrustly
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo
PlatformsWeb, CLI, DesktopWeb, API
Founded2001Unknown

Identical on both: user rating (Not yet rated), category (APIs).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Swagger/OpenAPI

  • OpenAPI Specification
  • Interactive Documentation
  • Code Generation
  • GitHub
  • GitLab
  • Jenkins
  • IDE plugins
  • Web support

Only in Trustly

  • Pay by bank checkout
  • Instant refunds
  • Verified payouts
  • Multi-market bank connectivity
  • Merchant dashboard and reconciliation
  • Fraud and risk tooling

What people use each for

The jobs each tool is most often brought in to do.

Swagger/OpenAPI

  • API Developmentnot Trustly
  • API Gatewaynot Trustly
  • API Testingnot Trustly
  • API Documentationnot Trustly
  • Microservicesnot Trustly

Trustly

  • An e-commerce merchant wanting a lower-cost alternative or complement to card payment acceptancenot Swagger/OpenAPI
  • A gaming or gambling operator needing verified, instant payouts to players' bank accountsnot Swagger/OpenAPI
  • A merchant wanting instant refunds processed directly to a customer's bank account rather than card reversal delaysnot Swagger/OpenAPI
  • A business in a market with strong open banking adoption wanting pay-by-bank as a checkout optionnot Swagger/OpenAPI

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Swagger/OpenAPI

  • The OpenAPI Specification itself is licensed under Apache License 2.0 and free to use; SwaggerHub is a separate paid tool built on top of it

Trustly

  • It is majority-owned by Nordic Capital, a private equity firm, so its long-term roadmap is ultimately oriented toward an eventual sale or IPO rather than indefinite independent operation.
  • Consumer familiarity with paying by bank transfer still lags card payments in most markets, so merchants typically see it used as a secondary option rather than a full card replacement.
  • The 1.15 to 3.15% merchant fee range is not a single published rate, so a merchant cannot know its actual cost without a sales negotiation.
  • As with all open banking-dependent payment methods, reliability depends on the consistency of the underlying banks' own APIs, which Trustly does not control.
  • Its verified payout functionality is heavily used in gaming and gambling, a sector with additional regulatory scrutiny, which is worth factoring in when evaluating vendor risk exposure by association.

Pricing, plan by plan

Swagger/OpenAPI

Free
  • Open SourceFree
    • OpenAPI specification
    • Community tools
  • SwaggerHub FreeFree
    • Cloud editor
    • API mocking
    • API testing
  • SwaggerHub Pro$75/monthly
    • Team collaboration
    • Advanced mocking
    • Analytics

Trustly

On request
  • Trustly$undefined/month
    • Typical merchant cost of 1.15% to 3.15% depending on volume and market
    • Exact rate negotiated per merchant, not published as a flat card

Which should you pick?

Choose Swagger/OpenAPI if

  • You need openapi specification.
  • You want to start without paying.
  • You work on Web, CLI, Desktop.
  • You also want interactive documentation.
Swagger/OpenAPI review

Choose Trustly if

  • You need pay by bank checkout.
  • You work on Web, API.
  • You also want instant refunds.
Trustly review

Questions people ask

Is Swagger/OpenAPI or Trustly better?
Neither clearly leads. Swagger/OpenAPI starts at Free and Trustly at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Swagger/OpenAPI or Trustly?
Swagger/OpenAPI has a free tier; the other does not. Paid plans start at Free for Swagger/OpenAPI and On request for Trustly.
Does Swagger/OpenAPI or Trustly run on more platforms?
Swagger/OpenAPI runs on Web, CLI, Desktop. Trustly runs on Web, API.
Can I use Swagger/OpenAPI for free?
Yes. Swagger/OpenAPI has a free tier, so you can try it without paying. Trustly starts at On request.
What is Swagger/OpenAPI best used for?
Swagger/OpenAPI is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what Trustly is typically brought in for.
What can Swagger/OpenAPI do that Trustly cannot?
Swagger/OpenAPI covers OpenAPI Specification, Interactive Documentation, Code Generation, GitHub. Trustly covers Pay by bank checkout, Instant refunds, Verified payouts, Multi-market bank connectivity.

Answered from the vendors’ own pages

Swagger/OpenAPI: Is Swagger UI free to use?

Swagger UI is an open source tool with source code publicly available on GitHub at no cost. It is one of thousands of free open source projects in the Swagger ecosystem.

Source
Trustly: Who owns Trustly?

Nordic Capital, a private equity firm, holds a 51.1% majority stake; Alfven & Didrikson and BlackRock hold smaller stakes.

Swagger/OpenAPI: What commercial Swagger products are available beyond the open source tools?

Swagger offers Swagger for Teams for streamlined API workflow with interactive editors and hosted documentation, and Swagger Enterprise for organizations needing secure on-premise or cloud-based environments. Specific pricing requires contacting sales.

Source
Trustly: Is Trustly going public?

It has discussed an IPO but as of its most recent comments said one remained at least a year away.

Swagger/OpenAPI: Are there commercial versions that build on the open source Swagger tools?

Yes, commercial Swagger products integrate the core functionality of Swagger open source tools (Editor, UI, and Codegen) with advanced capabilities for team collaboration, standards enforcement, and enterprise features.

Source
Trustly: What does it typically cost a merchant?

Roughly 1.15% to 3.15% of transaction value depending on volume and market, negotiated per merchant.

Swagger/OpenAPI: Is there a trial available for Swagger commercial products?

A Start Trial call-to-action is available on the Swagger website, but specific trial duration and terms are not disclosed on the product pages.

Source
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