Skip to main content

REMAIN API Studio based on OpenAPI standards

Our Remain API Studio enables you to easily create a full OAS3 spec-compliant API definition. It includes a rich editor with API testing, import, export and code generation. It contains built-in documentation for all parts of the OAS3 specification. The visual editor enables you to inspect and edit your API specification in a human-readable way. No more wading around in JSON or YAML unless you want to.

Our Remain API Studio can be integrated with TD/OMS or it may be used standalone.


The OpenAPI Specification, OAS3, enables you to define REST interfaces for your data and services that can be consumed on a global scale.

Running over the HTTP protocol, these services are mostly written in languages like Java and Python. What if you could write your OAS3 specification and then run the service in native ILE? Bypassing time and resource consuming middleware is a big advantage. Another advantage is that you can leverage your existing skill set to deliver your data and services.

Imagine using an API from a third party, like checking the validity of a telephone number, in RPGLE as well. 


Using an API provides a standard way of communicating

Benefits of using oas3

  • Utilize a world-wide standard.
  • Choose from many standard services.
  • Focus on your core business and not boiler-plate code.

Benefits of making REST APIs

  • Mobile strategy.
  • Low code strategy.
  • Self-serving global access for your customers.
  • API strategy for the future.

The Editor in Action

We have added an overview video video on YouTube that shows you how the editor is used. It creates a simple login service from the ground up. It touches on the most important parts of the spec and editor. If you are new to OAS3, we encourage you to investigate its enormous potential.

Try Before You Buy

If you want to take a closer look at the Remain API Studio, you are able to download a trial version. Please follow this link to the download form and install the product.

The product contains built-in documentation, but you may also send an email to with your questions. You can even sign up on our support site at


Link to the download form

IBM i - REST API Made Simple

You are able to generate OpenAPI specifications with TD/OMS from your database definitions. The real power comes with the ability to visually maintain the OpenAPI specifications and use them in combination with generating code. This combination enables you to expose your data through a REST interface and create the OpenAPI specification contract and necessary code in one fluent interface.