Dev tools · alternatives · 2026

24 alternatives to Swagify.io

Convert Postman Collection to Swagger/Open API Spec

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Swagify.io launched in 2023; newer entries below may have overtaken it.

1
Swagger Editor▲207
Beautiful API references from Swagger, OpenAPI spec
2023 · its alternatives →
2MA
Mitmproxy2swagger – Automagically reverse-engineer REST APIs▲691
2022 · github.com · its alternatives →
3
Swagger Inspector▲141
Free online tool to test APIs and autogenerate documentation
2018 · its alternatives →
4
Mock API Generator▲548
Generate custom data & API to build apps in less than 30s
2021 · its alternatives →
5AF
A faster way to prototype your APIs using OpenAPI 3 and Swagger UI▲77
2020 · github.com · its alternatives →
6NW
New way to test APIs with OpenAPI and Postman▲80
2021 · github.com · its alternatives →
7
Postman Collections▲302
Biggest library of ready-made API collections for Postman
2017 · its alternatives →
8
Simple API Generator (Rest + GraphQL)▲121
Instantly generate openapi (OAS) 3.0.0 REST + GraphQL APIs
2019 · its alternatives →
9
Apidog Fast Request▲512
Develop APIs fast + automatically detect endpoints
2025 · fastrequest.apidog.com · its alternatives →
10
Zeroqode API Tools▲130
Biggest Library of ready-made API Collections for Postman
2018 · its alternatives →
11
RecipeUI▲143
Open source type-safe Postman alternative
2023 · its alternatives →
12AJ
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 →
13
create-api.dev by Kong▲150
Generate and share OpenAPI specs with AI
2025 · api.dev · its alternatives →
14LO
Library of API collections for Postman▲77
2017 · postmancollections.com · its alternatives →
15
TestMagic▲53
AI-powered API test automation. Save 90% of testing time
2025 · irual.me · its alternatives →
16OS
Open-source Swagger/OpenAPI documentation engine▲6
2016 · github.com · its alternatives →
17
Platapi▲108
Convert OpenAPI docs to working dynamic mock endpoints
2024 · its alternatives →
18
Swag Doc▲8
automatically generate swagger documentation from api.
2025 · github.com · its alternatives →
19
ApiHome▲73
Home of API testing
2022 · its alternatives →
20
Visual Swagger Editor for Teams▲89
Link your app design to API calls
2022 · its alternatives →
21
SwaggerHub Explore▲72
Evaluate the functionality of any API
2023 · its alternatives →
22
YAML Studio▲7
Create OpenAPI YAML visually
2025 · its alternatives →
23
Docgrit▲3
Smart API documentation generator
Nov 2025 · docgrit.com · its alternatives →
24OS
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 →

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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 →