Best API Clients 2026

WebWindowsMac+3 Free plan Record5.0 Visit

Command-line program for accessing gRPC servers through a browser-based web interface.

WebWindowsMac+2 Free plan Record4.8 Visit

Free command-line transfer tool for HTTP and other network protocols on desktop platforms.

AndroidiPhone & iPadWindows+2 Free plan Record4.8 Visit

C# library that turns annotated interfaces into generated HTTP clients during the build.

WebWindowsAPI Free plan Record4.6 Visit

Open-source terminal application for API development and testing across Linux, macOS, and Windows.

WindowsMacLinux Free plan Record4.6 Visit

REST service for WHOIS, DNS, SSL, domain availability, email intelligence, subdomains, and monitoring lookups.

WebWindowsMac+2 $10 a month, billed yearly Record4.6 Visit

Free, browser-based GraphQL IDE with query completion, type-ahead suggestions, and error reporting.

WebSelf-hosted Free plan Record4.4 Visit

WindowsMacLinux $199 one-time Record4.4 Visit

WindowsMacLinux+1 Free plan Record4.3 Visit

WindowsMacLinux Free plan Record4.0 Visit

Free API package for working with SPARQL services on Linux.

LinuxAPI Free plan Record3.2 Visit

API package for accessing NASA POWER data through an API.

API Free plan Record3.1 Visit

Paid Windows API client with no listed GraphQL, gRPC, or WebSocket support.

Windows $39.99 a month Record2.7 Visit

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