Life & fun · alternatives · 2026

24 alternatives to New way to test APIs with OpenAPI and Postman

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀 - apideck-libraries/portman

This tool combines OpenAPI specifications with Postman to streamline API testing. It enables developers to automatically generate and execute test cases based on API documentation, reducing manual testing effort. The… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. New way to test APIs with OpenAPI and Postman launched in 2021; newer entries below may have overtaken it.

1
ApiHome▲73
Home of API testing
2022 · apihome.io · its alternatives →
2
OpenAPI DevTools – Chrome extension that generates an API spec▲811
Effortlessly discover API behaviour with a Chrome extension that automatically generates OpenAPI specifications in real time for any app or website.
2023 · github.com · its alternatives →
3
Cursor for your API▲473
Generate, edit, lint & test your API workflow in one place
2025 · app.getelva.ai · its alternatives →
4
Apidog▲570
Development teams often struggle with using multiple tools like Postman and Swagger for API design, development, and testing. This fragmented approach leads to outdated API specs and chaotic collaboration. So we built Apidog: a single, unified API platform for team collaboration. It has a beautiful interface that makes it easy to create API spec, generate request data from API spec, validate responses, create mock data, orchestrate test scenarios, and publish API documentation. Apidog = Postman + Swagger + Mock + JMeter.
2024 · apidog.com · its alternatives →
5
Turn your OpenAPI spec into negative tests▲50
I’ve been working on an open-source CLI tool called Dochia for a while now. The reason for building it: in microservices architectures, testing is repetitive: every service exposes APIs, and much of the testing process will share a similar set of test cases: negative inputs, boundary cases, encoding quirks, invisible characters. I wanted a tool that could automate this shared layer of testing instead of doing it manually across dozens of services. So what Dochia does: reads your OpenAPI spec; generates thousands of smart, edge-case payloads automatically and produces detailed reports with…
2025 · github.com · its alternatives →
6
Auto-generate an OpenAPI spec by listening to localhost▲178
Hey HN! We've developed OpenAPI AutoSpec, a tool for automatically generating OpenAPI specifications from localhost network traffic. It’s designed to simplify the creation of API documentation by just using your website or service, especially useful when you're pressed for time. Documenting endpoints one by one sucks. This project originated from us needing it at our past jobs when building 3rd-party integrations. It acts as a local server proxy that listens to your application’s HTTP traffic and automatically translates this into OpenAPI 3.0 specs, documenting endpoints, requests, and…
2024 · github.com · its alternatives →
7
A faster way to prototype your APIs using OpenAPI 3 and Swagger UI▲77
A generator for OpenAPI 3. Contribute to egorsmkv/openapi3-generator development by creating an account on GitHub.
2020 · github.com · its alternatives →
8
Agents.json – OpenAPI Specification for LLMs▲212
Hey HN, we’re building an open specification that lets agents discover and invoke APIs with natural language, built on the OpenAPI standard. agents.json clearly defines the contract between LLMs and API as a standard that's open, observable, and replicable. Here’s a walkthrough of how it works: https://youtu.be/kby2Wdt2Dtk?si=59xGCDy48Zzwr7ND. There’s 2 parts to this: 1. An agents.json file describes how to link API calls together into outcome-based tools for LLMs. This file sits alongside an OpenAPI file. 2. The agents.json SDK loads agents.json files as tools for an LLM that…
2025 · github.com · its alternatives →
9
Library of API collections for Postman▲77
Accelerate API development with Postman's all-in-one platform. Streamline collaboration and simplify the API lifecycle for faster, better results. Learn more.
2017 · postmancollections.com · its alternatives →
10
create-api.dev by Kong▲150
Generate and share OpenAPI specs with AI
2025 · api.dev · its alternatives →
11
We built a tool that automatically generates API tests▲108
Hi, this is Mish and Sebastian. We are working on Step CI - a fully automated API testing platform for developers. Step CI works programming-language independent and for different API paradigms (REST, GraphQL, XML). Our CLI and test runner are available on GitHub (https://github.com/stepci) under the MPLv2 license. Since our last launch, Step CI is now able to generate automated tests for your API based on your OpenAPI (Swagger) spec. This saves you a lot of time as you never have to write and maintain your tests again! We would like to invite you to try our tool and give us…
2022 · stepci.com · its alternatives →
12
Web App for generating mocked data from an OpenAPI specification▲19
Progressive Web App for generating mocked data from an OpenAPI specification - Fredx87/openapi-mock-generator
2020 · github.com · its alternatives →
13
Generate OpenAPI from Your Tests▲16
OpenAPI linting, diffing and testing. Optic helps prevent breaking changes, publish accurate documentation and improve the design of your APIs. - optic/docs/generate-openapi.md at main · opticdev/optic
2023 · github.com · its alternatives →
14
Octrafic▲130
Test your APIs in plain English, straight from the terminal
Mar 2026 · its alternatives →
15
Swagger Inspector▲141
Free online tool to test APIs and autogenerate documentation
2018 · swagger.io · its alternatives →
16
We made a tool to help developers improve OpenAPI specs▲105
Hey, I'm Martyn and I recently joined Zuplo. OpenAPI is a huge part of what we do, but getting a document up to scratch out of the gate, especially if you're not super well versed in the actual specification and what you should use and when. So we built a suite of tools to help with this called Rate My OpenAPI. It will score your OpenAPI document out of 100, as well as giving you individual scores in 4 key areas; completeness, SDK generation, security and documentation. Along with the score, you also get details of what the issues, or errors are, as well as guidance on what they actually…
2024 · github.com · its alternatives →
17
Routebase▲106
Design, mock, test, and document APIs from one living spec. Full test runner built in: suites, scenarios, ten auth schemes, CLI in CI. No OpenAPI needed.
Jul 2026 · routebase.dev · its alternatives →
18
Open-source tool to generate OpenAPI docs from your code▲11
We built an open-source tool that scans your codebase and generates OpenAPI docs in minutes. Right now it supports Rails, Go, Python, and NodeJS frameworks, and we will keep adding more. It picks up routes, params, request bodies, and models directly from the code and outputs a clean OpenAPI spec you can drop into your workflow.
Nov 2025 · github.com · its alternatives →
19
Postman▲182
Postman is a powerful HTTP client to test REST API
2014 · postman.com · its alternatives →
20
FastOpenAPI – automated docs for many Python frameworks▲153
FastOpenAPI is a library for generating and integrating OpenAPI schemas using Pydantic v2 and various frameworks (AioHttp, Django, Falcon, Flask, Quart, Sanic, Starlette, Tornado). - mr-fatalyst/fastopenapi
2025 · github.com · its alternatives →
21
TestMagic▲53
AI-powered API test automation. Save 90% of testing time
2025 · irual.me · its alternatives →
22
Api2ai – create an API agent from any OpenAPI Spec▲23
api2ai parses OpenAPI Spec to generate an agent that can make API calls. For context, I recently need to explore a handful of API suites and thought LLMs can help expedite this process. After some digging, I found OpenAPI Specs are perfect fit for function calling. Based on a text prompt, api2ai can select the right endpoint and properly parse request params and make api calls. It also handles authentication, currently it supports basic auth, api keys, and bearer token schemes. The tool has helped me explore and see APIs in action without a deep dive into the docs or using postman. It’s open…
2023 · github.com · its alternatives →
23
OpenAPI fuzzer – fuzzing APIs based on OpenAPI specification▲76
Black-box fuzzer that fuzzes APIs based on OpenAPI specification. Find bugs for free! - matusf/openapi-fuzzer
2021 · github.com · its alternatives →
24
Instant API – Build type-safe web APIs with JavaScript▲102
Hey there HN! I just wrapped up an all-day documentation spree for Instant API, a JavaScript framework for easily building web APIs that implements type safety at the HTTP interface. It uses a function-as-a-service approach combined with a slightly modified JSDoc spec to automatically enforce parameter and schema validation before HTTP requests make it through to your code. You just write comments above your endpoint functions and voila, enforced type safety contracts between your API endpoints and your developers. OpenAPI specifications are generated automatically as a byproduct of simply…
2023 · github.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →