Top AI tools for API Developer

Yii is a high-performance PHP framework that enables developers to build robust web applications quickly with minimal overhead and built-in security features.

• Free

RoostGPT is an AI-powered testing co-pilot that automates test case generation, providing 100% test coverage while detecting static vulnerabilities. It leverages Large Language Models to enhance software development efficiency and reliability.

• Paid
• From 25000$

Monoid is an open-source platform that transforms APIs into AI Agents, enabling LLMs to gain context and perform real-time actions through a seamless and customizable interface.

• Free Trial

Grafbase is an enterprise-grade GraphQL Federation platform offering self-hosted deployment, high performance, and AI agent integration for unified API management.

• Free Trial
• From 2999$

Qodex.ai is an AI-powered API testing platform that automates end-to-end testing processes with zero coding required, offering comprehensive test coverage and auto-healing capabilities for enterprise-level QA efficiency.

• Freemium
• From 199$

JSON Data AI is a tool that converts natural language prompts into API endpoints, allowing users to generate and fetch structured JSON data about any topic.

• Freemium

A web-based tool that provides real-time token counting and cost estimation for various Large Language Models (LLMs), including OpenAI's GPT models and Anthropic's Claude models.

• Free

JSON Studio is a free online tool designed for formatting, validating, editing, and beautifying JSON data with enhanced visualization and conversion features.

• Free

CodeceptJS is an open-source, AI-powered testing framework for Node.js that enables scenario-driven end-to-end testing across web, mobile, and API platforms with driver-agnostic execution.

• Free

jsonAI is a powerful tool that converts various data formats into structured JSON using AI, offering customizable schemas and dedicated API endpoints for seamless integration.

• Freemium
• From 3$

Postman is a comprehensive platform for collaborative API development, enabling teams to prototype, document, test, and demo APIs in one place.

• Freemium
• From 19$

Sideko is an AI-powered API platform that generates production-ready SDKs, documentation, and integrations, cutting development time by 90%+ while ensuring automatic updates and maintenance.

• Freemium
• From 400$

Apollo GraphOS is a GraphQL developer platform that helps teams build, scale, and manage APIs. It offers solutions for faster development, improved quality, and powerful tooling.

• Freemium

Stainless API automates the creation and maintenance of robust client libraries (SDKs) for various programming languages, saving significant development time and resources.

• Paid
• From 250$

Fission is an open-source serverless framework for Kubernetes that enables developers to write and deploy short-lived functions in multiple languages without container management, featuring fast cold-start times and event-driven triggers.

• Free

JSONViewer.AI is a free online tool that validates and beautifies JSON data, ensuring data integrity and readability for developers, API developers, and data analysts.

• Free

Hasura offers a universal data access layer, enabling rapid development and deployment of high-quality APIs for applications and AI initiatives. It simplifies data access, accelerates innovation, and streamlines governance across various data sources.

• Freemium
• From 5$

Aspen is a free, native macOS app for testing REST APIs locally. It features an AI assistant to speed up API integrations, with no login required.

• Free

Cyclr is an AI orchestration and embedded iPaaS platform that enables businesses to integrate AI models, agents, and SaaS applications through low-code tools and scalable multi-tenanted infrastructure.

• Freemium
• From 999$

DeepDocs is a GitHub AI agent that automatically scans repositories on pull requests to fix outdated documentation, eliminating manual effort and ensuring accurate, up-to-date docs for developers and AI agents.

• Freemium
• From 25$

Gravitee is an advanced API management platform that consolidates the management of APIs, event streams, and agentic AI systems, enabling secure, fast, and unified governance across multiple gateways and brokers.

• Paid
• From 1250$

NetFoundry provides a zero trust networking platform that replaces traditional VPNs with identity-based segmentation, secure API connectivity, and microsegmentation for IT/OT environments.

• Free Trial

Apidog Fast Request is a free IntelliJ IDEA plugin designed to accelerate API development for Java/Kotlin projects by automatically detecting endpoints, filling parameters, and enabling one-click request sending.

• Free

Zudoku is an open-source framework for building highly customizable API documentation using OpenAPI specifications, featuring AI search and static site generation.

• Free

Treblle is an advanced API observability and management platform that offers real-time documentation, security monitoring, and compliance checking for modern API development.

• Contact for Pricing

JSON Merge is a comprehensive online utility that provides free tools for merging, comparing, validating, and editing JSON files with intelligent algorithms and client-side processing for data security.

• Freemium
• From 10$

Prompt Assist provides developers with expertly crafted prompt engineering solutions designed to enhance the effectiveness of AI-powered coding assistants such as ChatGPT, Claude, and GitHub Copilot.

• Other

RapidMCP transforms existing REST APIs into AI-agent ready MCP servers without requiring backend modifications, enabling quick integration with AI agents supporting the MCP protocol.

• Freemium
• From 12$

Konfig is an AI-powered platform that automates the generation of SDKs, documentation, demos, and tutorials for REST APIs, streamlining developer onboarding and integration processes.

• Contact for Pricing

Stoplight is a comprehensive platform for designing, documenting, and building high-quality APIs, providing an intuitive workflow for teams of any size. It streamlines API development through a design-first approach, accelerating productivity and improving consistency.

• Free Trial
• From 41$

GraphDev is a comprehensive toolkit designed for GraphQL development, offering debugging, testing, and collaboration features. It incorporates an AI assistant for enhanced schema management and productivity.

• Freemium
• From 14$

AuthGPTs simplifies API security and SaaS deployment with a one-time purchase, offering tools for OAuth2, analytics, and payment integration. It is a cost-effective solution designed to streamline the launch of GPTs as complete SaaS products.

• Pay Once

hapi is a secure, enterprise-grade Node.js framework designed for building scalable, high-quality backend applications with minimal overhead and extensive out-of-the-box functionality.

• Free

pREST is an open-source RESTful engine that provides fast, secure, and scalable data access via RESTful interfaces for PostgreSQL databases, simplifying backend development for modern applications.

• Free

Proxyman is a native macOS application that captures, decrypts, and mocks HTTP(s) requests and responses with powerful debugging tools for developers.

• Freemium
• From 12$

Yugo is a platform that simplifies the integration of AI functionalities into web services, reducing development time and complexity.

• Free

AirCode provides a streamlined platform for debugging, building, and deploying actions for GPTs and other serverless functions. Develop Node.js functions directly from your browser with integrated database and file storage, and deploy production-ready APIs with a single click.

• Freemium
• From 20$

Celerforge uses AI to instantly generate mock APIs, accelerating development cycles and eliminating tedious hand-coding. It's perfect for rapid API prototyping and testing.

• Freemium
• From 8$

Axe API is a TypeScript-based framework designed to simplify building high-quality Rest APIs with automatic endpoint generation, robust query features, and auto-documentation.

• Free

liblab empowers developers to instantly generate custom SDKs, streamlined documentation, and AI-driven interfaces for APIs, enhancing efficiency and user experience.

• Usage Based
• From 5$

Mintlify provides a modern documentation platform that is beautiful, easy to maintain, and designed to convert users. It offers features like a web editor, AI assistance, and API playground.

• Freemium

Tadata offers Model Context Protocol (MCP) servers as a service, simplifying integration between developers, AI agents, and digital products.

• Free Trial

dblayer is an AI-powered platform that connects databases to generate custom RESTful APIs and applications with built-in authentication and intelligent caching for developers and teams.

• Freemium
• From 19$

PostPilot is a local-first developer workspace combining API testing, database querying, and data inspection tools in a single private environment for streamlined workflow and enhanced productivity.

• Freemium

Postlog automates API documentation, transforming code into clear, concise docs for frameworks like Express, Flask, Django, and FastAPI. It leverages advanced LLM technology for speed and accuracy.

• Freemium
• From 10$

Kreya is a desktop API client that enables developers to explore, test, and automate API workflows for gRPC, REST, WebSocket, and Server-Sent Events protocols with privacy-first architecture and Git-native collaboration.

• Freemium

Traceable AI is a comprehensive API security platform that provides unmatched API discovery, attack detection, and protection through AI-powered contextual analysis and threat hunting capabilities.

• Contact for Pricing

WireMock Cloud is an AI-powered API simulation platform that helps developers, QA teams, and AI agents build and test software faster by replacing unreliable third-party APIs with realistic mocks.

• Freemium

AI Placeholder is a versatile API service that uses OpenAI's GPT-3.5-Turbo to generate customizable dummy data for testing and development purposes. It offers both hosted and self-hosted solutions for generating realistic mock data.

• Free

Docuo is a lightweight platform that transforms your static content into interactive documentation websites, including developer hubs, API references, and product guides.

• Free