API Tools

Discover, compare, and save the best api tools alternatives.

API Tools are software solutions designed to help developers build, test, and manage APIs (Application Programming Interfaces). These tools are ideal for developers, DevOps teams, and organizations that rely heavily on APIs for their applications and services. When choosing an API Tool, consider factors like ease of use, scalability, security, and integration capabilities. Different tools offer varying features, such as API testing, mocking, and documentation generation. Alternatives like Postman and PhantomBuster differ in their approach to API development, testing, and automation.

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Postman

Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration.

✦ Best for api developers and qa engineers

FreemiumProprietaryAPI ToolsRequest BuilderCollectionsMock Servers

PhantomBuster

PhantomBuster is a browser extension and API that automates web scraping and data extraction tasks.

✦ Best for web developers and data analysts

Paid (Subscription)ProprietaryAPI Tools

spdlog

spdlog is a lightweight, header-only C++ library that provides fast, thread-safe logging with a simple API. It supports both synchronous and asynchronous logging, multiple sinks, and customizable formatting, making it suitable for a wide range of projects. Designed for modern C++ developers, spdlog integrates seamlessly with existing codebases and offers extensive configurability without sacrificing performance. It is free, open-source, and runs on Windows, macOS, Linux, and Web platforms.

✦ Best for c++11+ developers needing fast, header‑only, thread‑safe logging

FreeOtherAPI ToolsHeader-onlyAsync loggingMultiple sinks

Tesseract.js

tesseract.js is a JavaScript library that provides Optical Character Recognition (OCR) capabilities for more than 100 languages. It allows developers to extract text from images and scanned documents in a variety of languages, making it a useful tool for applications that require text recognition. The library is designed to be easy to use and integrate into web applications, and it can be used for a wide range of tasks, from simple text extraction to more complex document analysis.

✦ Best for developers needing multilingual text recognition

FreeApache-2.0API ToolsAI-PoweredCross-PlatformMulti-Language

zxing

ZXing is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. It has been widely used in various applications, including Android and other mobile platforms.

✦ Best for experienced java and android developers

FreeApache-2.0API ToolsCross-PlatformBarcode ReaderQR Code Generator

jsoncrack.com

Jsoncrack.com is a tool for analyzing and visualizing JSON data. It provides a simple and intuitive interface for exploring and understanding JSON data structures.

✦ Best for casual json data explorers

FreeApache-2.0API ToolsJSON ParsingData VisualizationCode Generation

Insomnia

Insomnia is a developer‑focused tool that lets you design, debug, and document APIs from a single, intuitive interface. It runs on Web, Windows, macOS, and Linux, providing a consistent experience wherever you work. With a freemium model, Insomnia offers robust features for individual developers and entire API teams, including collaboration, environment management, and seamless integration with popular API gateways and services.

✦ Best for dev teams needing unified api design, testing, and docs

FreemiumApache-2.0API ToolsCross‑PlatformGraphQL SupportEnvironment Variables

Hoppscotch

Hoppscotch is a lightweight, web‑based tool that lets developers design, test, and document APIs without leaving the browser. Its clean UI supports REST, GraphQL, WebSocket, and gRPC, making it a versatile companion for any API workflow. The platform is open‑source, free to use, and integrates seamlessly with GitHub, GitLab, and Bitbucket, allowing teams to version‑control collections and share environments effortlessly.

✦ Best for dev teams needing a quick, browser‑based api tester/documenter

FreeMITAPI ToolsREST ClientGraphQL SupportWebSocket Testing

kong

Kong is an open-source API and AI gateway that enables developers to manage APIs and microservices with ease. It provides a scalable and secure platform for API management, analytics, and security.

✦ Best for large-scale enterprise api management

FreemiumApache-2.0API ToolsAPI ManagementMicroservices SupportAI-Powered

Bruno

Bruno is an open-source, lightweight alternative to Postman and Insomnia for exploring and testing APIs. It provides a simple and intuitive interface for sending HTTP requests and analyzing responses.

✦ Best for casual api testers and solo developers

FreeMITAPI ToolsAPI TestingCross-PlatformLightweight

osmnx

osmnx is a Python library for downloading, modeling, analyzing, and visualizing street networks and other geospatial features from OpenStreetMap. It allows users to easily retrieve and manipulate street network data, perform network analysis, and visualize the results. osmnx is designed to be easy to use and provides a simple, intuitive API for working with street network data.

✦ Best for urban planners and researchers

FreeMITAPI ToolsStreet Network AnalysisGeospatial DataNetwork Visualization

nsq

NSQ is an open‑source, high‑throughput messaging system designed for distributed architectures. It provides a simple, language‑agnostic protocol that lets services communicate reliably at scale. Built for modern cloud environments, NSQ runs on Linux and can be accessed via web interfaces for monitoring. It is self‑hosted, free, and integrates seamlessly with Go, Python, and Java applications.

✦ Best for linux‑based microservice teams needing free, fault‑tolerant messaging

FreeMITAPI ToolsHigh ThroughputLow LatencyHorizontal Scaling

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Frequently asked questions

What is the primary function of an API Tool?

The primary function of an API Tool is to assist developers in building, testing, and managing APIs, making it easier to create, deploy, and maintain applications and services.

How do API Tools like Postman and PhantomBuster differ?

Postman is a popular API client that focuses on API testing, documentation, and collaboration, while PhantomBuster is an automation tool that helps developers automate API workflows and data extraction tasks.

What features should I look for when choosing an API Tool?

When selecting an API Tool, look for features like API testing, mocking, documentation generation, scalability, security, and integration capabilities with other development tools.

Can API Tools be used by non-developers?

While API Tools are primarily designed for developers, some tools offer user-friendly interfaces and features that can be used by non-developers, such as technical writers or project managers, to collaborate on API development and testing.