The 57 Best API Tools in 2026

The Collaboration Platform for API Development

Automate web scraping and data extraction tasks with PhantomBuster

Unified API for LLM management and key redistribution

Nokia's public API marketplace for discovering, testing, and monetizing thousands of APIs.

Modern copy to clipboard solution without Flash

Lightweight API exploration and testing IDE

Delivery and shipment tracking API for Korean, Japanese and Chinese carriers

Open-source platform for reliable, durable workflow orchestration

Simplify geocoding for Ruby developers

A user-friendly HTTP client for testing and exploring APIs, available as CLI, Desktop, and web app.

Sync data warehouse insights into operational tools

A realtime, distributed messaging platform for fault‑tolerant microservices.

API and AI Gateway

API-first platform for scalable image and PDF generation

Interactive API documentation and developer hub platform with AI-assisted authoring.

Self-updating documentation platform that keeps docs in sync for both humans and AI agents.

API observability and governance platform that monitors, secures, and documents API traffic in real time.

Offline API documentation browser

A local-first, open-source API client for HTTP, GraphQL, gRPC, WebSocket, and SSE requests.

All-in-one platform to design, mock, test, and document APIs.

Interactive API docs for developers

Python toolkit for quantitative finance

Transfer data with various network protocols

Lightweight REST API client built directly into VS Code and JetBrains IDEs.

Python libraries for computational biology and bioinformatics

Fast, offline-first tool for designing and running mock REST APIs.

LLM calls that don't break

Street network analysis and visualization from OpenStreetMap

Barcode scanning library for Java and Android

Customizable maps and location services for developers

Connect APIs and build event-driven workflows with serverless code

Unified notification infrastructure for developers

Notification infrastructure API for sending product, marketing, and transactional messages.

Messaging platform for orchestrating notifications and lifecycle journeys across every channel.

Powerful data-fetching and caching for React apps

High-performance Node.js image processing

Open-source gateway that unifies 140+ LLM providers behind a single OpenAI‑compatible API

Open-source platform to sync data from any source to your warehouse

Draw pretty maps from OpenStreetMap data

Go library for reading and writing Microsoft Excel spreadsheets

Secure authentication for Next.js apps

Fast, open-source API testing and documentation in your browser

Fast, header-only C++ logging library for high-performance applications

Fast, zero-copy serialization library for games and services

Python toolbox for seismology and earthquake data analysis

Design, document, and build APIs faster with an OpenAPI-first workflow.

Centralized secrets management for dev teams.

One API for AI Video, Image & Audio Generation

Privacy-focused Segment alternative

Built to eliminate the bottleneck between software teams and their customers' data.

Multi-channel messaging API for OTPs and transaction alerts across Africa.

Pure Javascript OCR for more than 100 Languages

JSON data analysis and visualization

Powerful API design, testing and documentation in one cross‑platform client

One API for 40+ providers, including OpenAI, Anthropic, and Google

Document understanding pipeline library

Programmatic access to interior design data and recommendations