🏅 Best API & Integration Tools

Open-source API client for REST, GraphQL and gRPC requests.

Open-source, lightweight API development environment.

Visual API client and testing tool for Mac developers.

Lightweight REST API client VS Code extension.

Industry standard for API description, design and documentation.

Developer portal and API documentation toolchain for OpenAPI.

Open-source API gateway and microservices management platform.

Open-source cloud-native API gateway and reverse proxy.

IoT smart home devices with open REST API and webhook support.

Google full-stack API management platform for enterprise.

Managed API gateway for REST, HTTP and WebSocket APIs on AWS.

Full lifecycle API management from design to retirement.

Open-source API gateway with analytics, rate limiting and key management.

Largest API marketplace with 40,000+ APIs to discover and connect.

Desktop and CLI API mocking tool — mock REST APIs locally.

Open-source HTTP mock server and proxy from OpenAPI spec.

GraphQL API management, explorer and performance monitoring.

Authentication API for passwordless login, SSO and fraud prevention.

Complete user management and authentication API for modern web apps.

Identity platform providing authentication and authorisation as a service.

Cloud communications API for SMS, voice, email and WhatsApp.

Transactional email delivery API for developers.

Communications API for SMS, voice and video.

Hosted APIs for adding realtime features like chat and notifications.

Realtime messaging API for building live features at scale.

Complete payment API covering charges, subscriptions and marketplace splits.

Financial data network API for connecting apps to bank accounts.

Image and video management API with transformation and CDN delivery.

Real-time image processing and delivery API for developers.

Geo-targeting toolkit for redirecting visitors, personalizing content, and localizing pricing based on visitor location.