Dev tools · alternatives · 2026
24 alternatives to EasyFunctionCall
Convert OpenAPI/Swagger specs to function call parameters
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
Automagically reverse-engineer REST APIs via capturing traffic - alufers/mitmproxy2swagger
2022 · github.com · its alternatives →
- 2
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
Swagger Editor▲207Beautiful API references from Swagger, OpenAPI spec
2023 · sandbox.scalar.com · its alternatives →
- 4
Free online tool to test APIs and autogenerate documentation
2018 · swagger.io · its alternatives →
- 5
Develop APIs fast + automatically detect endpoints
2025 · fastrequest.apidog.com · its alternatives →
- 6
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 →
- 7
A generator for OpenAPI 3. Contribute to egorsmkv/openapi3-generator development by creating an account on GitHub.
2020 · github.com · its alternatives →
- 8
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 →
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- 10
Gram Functions▲119Hi HN, Georges from the Gram team here. We're really excited to share a major update to Gram, our platform for curating tools for agents, in the form of Gram Functions. Gram initially started out by letting users upload OpenAPI documents and turning them into tools that can be curated into small MCP servers that power your agentic use cases. We've known for quite some time that many existing REST APIs are simply not suitable as LLM tools and we wanted to solve this problem by letting users simply write code and we would take care of deploying that code for them and hosting MCP servers. We…
Nov 2025 · speakeasy.com · its alternatives →
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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 →
- 13OS
OpenBLE is an API specification language and client generator for Bluetooth services built on the generic attribute (GATT) profile. Bluetooth development is a mess. Too many datasheets, too little documentation and SDK fragmentation across platforms. I built this tool to improve documentation, version control and development speed for BLE programs. Even though shunned by Apple and Mozilla, Web Bluetooth enjoys wide support and just works. It makes sense to build the frontend for OpenBLE using web Bluetooth. No SDK hell, no installations, wide support albeit experimental. I could ship the…
2023 · demo.openble.org · its alternatives →
- 14
- 15
Playcall▲97The open-source AI alternative to Gong
Aug 2026 · playcall.dphenomenal.com · its alternatives →
- 16
Better way to implement APIs in Go (finally!)
2025 · github.com · its alternatives →
- 17SA
Hi HN, https://superfunctions.com I'm working on a web app that allows Ai prompts to function as an API. I want to make it easier for developers to use Ai. I've found it painful to monitor, cache, and iterate on prompts. superfunctions.com is designed to be the simplest building block to create Ai powered apps and scripts. Simplest example I can think of: You want an api to convert human-named colors to hex You can write a prompt like: "convert {{query.color}} to color, only output hex for css" and then you can call your prompt with…
2023 · superfunctions.versoly.page · its alternatives →
- 18
TestMagic▲53AI-powered API test automation. Save 90% of testing time
2025 · irual.me · its alternatives →
- 19
- 20
Use serverless functions from a community discussion library
2018 · its alternatives →
- 21
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 →
- 22API 200▲14
I frequently face numerous challenges when working with third-party APIs - error handling, logging, caching, retries, mocking, and more. I spent hours making them work, so I created an app to automate integrations. Currently, the platform offers the following functionality: - Set up services with multiple endpoints: Configure caching, retries, mocking, response transformation, and fallback responses. - Define authentication:- Real-time Swagger/OpenAPI integration: Test your endpoints directly in the browser. - Handy code snippets: Easily copy and paste requests. Feedback needed!
2025 · api200.co · its alternatives →
- 23
2024 · github.com · its alternatives →
- 24
TLDR: OpenAPI-MCP is a Dockerized server that dynamically generates Model Context Protocol (MCP) tool definitions directly from your Swagger/OpenAPI documentation. It allows your AI agent to seamlessly access any API without additional coding, streamlining development and eliminating repetitive manual setup. For more details, code updates-----: GitHub: ckanthony/openapi-mcp Docker Hub: ckanthony/openapi-mcp
2025 · github.com · its alternatives →
Also compare
- Mitmproxy2swagger – Automagically reverse-engineer REST APIs alternatives
- OpenAPI DevTools – Chrome extension that generates an API spec alternatives
- Swagger Editor alternatives
- Swagger Inspector alternatives
- Apidog Fast Request alternatives
- Instant API – Build type-safe web APIs with JavaScript alternatives
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 →