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Style Guide

How to (and how not to) refer to the OAI in meetups, interviews, casual conversations, the settling of bar bets, and for conference presentations.

OpenAPI Initiative

The goal of the OAI is to create an open approach to governing the continued evolution of the OpenAPI Specification used for describing RESTful APIs.

The OpenAPI Initiative (OAI) is comprised of a consortium of forward-looking domain experts who – coming from a wide range of industry backgrounds – recognize the immense value of standardizing on how REST APIs are described. As an open governance structure under the Linux Foundation, the OAI is focused on creating, evolving and promoting a vendor-neutral, open-source description format: OpenAPI Specification.


A Short History of the OpenAPI Initiative and the OpenAPI Specification

On Nov. 5, 2015, SmartBear in conjunction with 3Scale, Apigee, Capital One, Google, IBM, Intuit, Microsoft, PayPal, and Restlet announced the formation of the OpenAPI Initiative, an open source project under the Linux Foundation. As part of the formation of the OAI, SmartBear donated the Swagger specification to the Linux Foundation, meaning that the OpenAPI Specification is semantically identical to the specification formerly known as the Swagger 2.0 specification. It is widely recognized as the most popular open source framework for defining and creating RESTful APIs, and today tens of thousands of developers are building thousands of open source repos of tools leveraging the OpenAPI Specification. In 2010, the Swagger specification was created by Wordnik, who published it under an open source license one year later. In March of 2015, SmartBear acquired Wordnik’s interests in the Swagger projects from its parent company, Reverb Technologies.

The Specification Name and Usage

  • OpenAPI Specification refers the name of the popular API description format. It contains ONE space and FIVE capital letters. Following the first instance, it may be referred to as:
  • OAS: for example, “Can you send us your OAS document?”
    Specification: for example “Can you send me your specification?” (may be abbreviated less formally as “spec”)
  • OpenAPI (when referring to the format in comparison to another): such as *”OpenAPI has a different signature mechanism than WSDL.” *

In order to connect readers familiar with the former name of the specification it may be introduced as, “The OpenAPI Specification, formerly known as the Swagger specification.” (Note that if Swagger is mentioned in this way, it should be accompanied by the word “specification” as Swagger remains SmartBear’s trademark for certain open source tools.)

The Initiative Name and Usage

The OpenAPI Initiative refers to the organization that oversees the specification. It must contain ONE space and FIVE capital letters. After the initial declaration, it may be referred to as the “OAI” in subsequent references, for example:

  • The OpenAPI Specification (OAS) provides an open governance model, as directed by the OpenAPI Initiative’s charter. The specification, although managed by the OAI, is are not one the same as the initiative itself.

References to Teams in the Project

As per the charter, the OpenAPI Initiative (OAI) provides an open source, technical community, within which industry participants may contribute to building a vendor-neutral, portable, and open specification for providing technical metadata for REST APIs — the OpenAPI Specification (OAS). The following named groups may be properly referred to as:

  • Business Governance Board (“BGB”, second reference)
    Comprised of official corporate entities (companies, schools, non-profits, etc.) who have signed the official project membership agreement to be members of the OpenAPI Initiative and are bound by the laws governed by the project’s charter.
  • Technical Steering Committee (“TDC”, second reference)
    The Technical Developer Community (TDC) is open to any developer, end user or subject matter expert that chooses to participate in the activities of OAI, regardless of whether the participant is employed by an OAI Member company. Influence on the evolution of the OAS comes by engaging with the TSC in technical discussions and by contributing to the project.
  • Technical Oversight Board (“TOB”, second reference)
    The Technical Oversight Board (TOB) is responsible for managing conflicts, violations of procedures or guidelines and any cross-project or high-level issues that cannot be resolved in the TDC for the Specification. The TOB shall also be responsible for adding, removing or re-organizing OAI Projects. The TOB shall not dictate or interfere with the day-to-day work of individual OAI Projects or their decisions. [Read more here]

Linux Foundation

The OpenAPI Initiative is one of the Linux Foundation’s Collaborative Projects, which are independently funded software projects that harness the power of collaborative development to fuel innovation across industries and ecosystems.

  • What is a Linux Foundation Collaborative Project?
    Collaborative Projects are independently funded software projects that harness the power of collaborative development to fuel innovation across industries and ecosystems. By spreading the collaborative DNA of the largest collaborative software development project in history, The Linux Foundation provides the essential collaborative and organizational framework so project hosts can focus on innovation and results. Linux Foundation Collaborative Projects span the enterprise, mobile, embedded and life sciences markets and are backed by many of the largest names in technology. For more information about Linux Foundation Collaborative Projects, please visit:
  • What is the Linux Foundation?
    The Linux Foundation is a nonprofit consortium dedicated to fostering the growth of Linux and collaborative software development. Founded in 2000, the organization sponsors the work of Linux creator Linus Torvalds and promotes, protects and advances the Linux operating system and collaborative software development by marshaling the resources of its members and the open source community. The Linux Foundation provides a neutral forum for collaboration and education by hosting Collaborative Projects, Linux conferences including LinuxCon, and generating original research and content that advances the understanding of Linux and collaborative software development. More information can be found at

This repository contains color (Pantone), black, and white versions of the OpenAPI Initiative’s logo in both vector and bitmap. Whenever possible, prefer the color logo, though white or black treatments may be considered more appropriate under certain conditions, and the lettering may be omitted where a purely graphical representation is required.

The logo may not be altered in anyway and may not be combined with another logo or lettering to imply it is part of the official logo. Unless otherwise stated, the OpenAPI Initiative usage applies to the Linux Foundation Trademark Usage Guidelines.