Best APIs in 2025

The Collaboration Platform for API Development.

Key Postman features:

User-Friendly Interface Collaboration Comprehensive Testing Tools Extensive API Documentation

Open Source

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Key Flagsmith features:

Feature Flags Remote Config A/B/X Testing & Optimization Organization Management

Try for free Open Source freemium

Intelligent and complete API platform.

Key Apigee features:

Robust API Management Security Features Scalability Analytics and Monitoring

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.

Key Insomnia REST features:

User-Friendly Interface Support for Multiple Protocols Environment Management Custom Plugins and Themes

Open Source

DreamFactory is an API management platform used to generate, secure, document, and extend APIs.

Key DreamFactory features:

Ease of Use Automatic API Generation Wide Database Support Scalability

Open Source freemium

Anypoint Platform is a unified, highly productive, hybrid integration platform that creates an application network of apps, data and devices with API-led connectivity.

Key MuleSoft Anypoint Platform features:

Comprehensive Integration User-friendly Interface Scalability Robust Security

Paw is a REST client for Mac.

Key RapidAPI for Mac features:

User Interface Team Collaboration Advanced Request Capabilities Extensions and Plugins

Open source API development ecosystem.

Key Hoppscotch features:

User-Friendly Interface Open Source Multi-Platform Support Real-Time Collaboration

Open Source freemium

API marketplace for finding and connecting to the world's top APIs.

Key RapidAPI features:

Wide Variety of APIs Unified Billing Ease of Integration Testing Environment

Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.

Key Zapier features:

Ease of Use Wide Range of Integrations Custom Automation Scalability

Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.

Key Webhook.site features:

Ease of Use Real-time Monitoring Customization Temporarily Generated URLs

Open Source freemium $14.0 / Monthly

AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.

Key AWS CloudTrail features:

Comprehensive Logging Enhanced Security Compliance and Auditing Integration

The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.

Key Boomi features:

Comprehensive Integration Platform Ease of Use Scalability Hybrid and Multi-Cloud Support

A collective list of APIs. Build something.

Key API List features:

Variety Ease of Access Free APIs Updated Content