Dev tools · alternatives · 2026
24 alternatives to go-simpl/simplapi
Better way to implement APIs in Go (finally!)
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier.
- 1
A generator for OpenAPI 3. Contribute to egorsmkv/openapi3-generator development by creating an account on GitHub.
2020 · github.com · its alternatives →
- 2
- 3
Automagically reverse-engineer REST APIs via capturing traffic - alufers/mitmproxy2swagger
2022 · github.com · its alternatives →
- 4
Simpl.▲330A pleasant Postgres browser for working with real data
Jan 2026 · simpl.sh · its alternatives →
- 5
SimplAIfree tier, from $5/mo▲589Hey HN, I've been building SimplAI for the past several months — it's a platform for building, testing, and deploying LLM-powered agents and multi-step workflows. The problem I kept running into: spinning up an AI agent pipeline means stitching together prompt management, tool calling, memory, evals, and deployment — often from scratch every time. SimplAI tries to be the layer that handles all of that so you can focus on what your agent actually does. What it does: - Visual + code-first workflow builder for chaining LLM calls, tools, and APIs - Built-in prompt versioning and A/B testing…
2025 · simplai.ai · its alternatives →
- 6
Swagger Editor▲207Beautiful API references from Swagger, OpenAPI spec
2023 · sandbox.scalar.com · its alternatives →
- 7
FastAPI framework, high performance, easy to learn, fast to code, ready for production
2019 · fastapi.tiangolo.com · its alternatives →
- 8
Generates Golang client and server based on OpenAPI2 (swagger) definitions - ExperienceOne/apikit
2020 · github.com · its alternatives →
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Go 1.26 adds native SIMD via GOEXPERIMENT=simd. This library provides a portability layer so the same code runs on AVX2, AVX-512, or falls back to scalar. Inspired by Google's Highway C++ library. Includes vectorized math (exp, log, sin, tanh, sigmoid, erf) since those come up a lot in ML/scientific code and the stdlib doesn't have SIMD versions. algo.SigmoidTransform(input, output) Requires go1.26rc1. Feedback welcome.
Jan 2026 · github.com · its alternatives →
- 11
Generate and share OpenAPI specs with AI
2025 · api.dev · its alternatives →
- 12
Go based GUI framework: practical, immediate mode, flexbox model - hasenj/go-shirei
Jul 2026 · github.com · its alternatives →
- 13
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 →
- 14TA
An OpenAPI alternative to describe REST APIs for type-safe code generation.
2023 · typeapi.org · its alternatives →
- 15
Instantly generate openapi (OAS) 3.0.0 REST + GraphQL APIs
2019 · github.com · its alternatives →
- 16
Generate FastAPI, NestJS & Go backends in minutes
Jul 2026 · fastdev.tech · its alternatives →
- 17
Create a new production-ready project by one CLI command
2021 · github.com · its alternatives →
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Huma REST/HTTP API Framework for Golang with OpenAPI 3.1 - danielgtaylor/huma
2023 · github.com · its alternatives →
- 20
Easily consume REST APIs with Go (golang). Contribute to bndr/gopencils development by creating an account on GitHub.
2014 · github.com · its alternatives →
- 21
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 →
- 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
Idiomatic Go (Golang) client package generation from OpenAPI documents - jbowes/oag
2017 · github.com · its alternatives →
- 24
Convert OpenAPI/Swagger specs to function call parameters
2025 · easyfunctioncall.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 →