Thunder Client vs Katalon: Features, Pricing and User Reviews 2026
Katalon
AI-Powered Test Automation for Web, Mobile, API & Desktop Apps

Katalon
AI-Powered Test Automation for Web, Mobile, API & Desktop Apps

What are Thunder Client and Katalon?
Thunder Client is a REST API testing tool that lives inside Visual Studio Code. You can send requests, check responses, and organize your API tests without opening another program. It works just like other API testing tools but runs directly in your code editor.
The extension saves all your requests and settings on your own computer. This makes it fast, private, and able to work without internet. You can also save your testing data to Git repositories, making it easy to share with your team.
Thunder Client offers both free and paid versions. The free version works great for basic testing, while paid plans add features like unlimited test runs, team management tools, and advanced testing options for businesses.
Katalon is a complete testing solution that automates the process of checking if software works correctly. Instead of testing applications manually every time, Katalon lets you create automated tests that run on their own.
The platform supports four main types of testing in one place: web applications, mobile apps (Android and iOS), APIs, and desktop programs. You can create tests using simple point-and-click recording, basic drag-and-drop actions, or by writing code if you prefer more control.
Katalon uses artificial intelligence to make testing easier. The AI can write test code from simple instructions, explain existing code, fix tests when websites change, and spot problems automatically. Tests can run on your computer or in the cloud.
Features of Thunder Client and Katalon
Lightweight VS Code extension for API testing
Local storage keeps data private and secure
Git sync for team collaboration
Collections organize related API requests
Environment variables for different settings
Scriptless testing with simple interface
CLI integration for automated testing
GraphQL, WebSocket, and gRPC support
Request chaining and advanced scripting
AI integration through MCP Server
AI-powered test creation and code generation
Web, mobile, API, and desktop testing support
No-code, low-code, and full-code options
Self-healing test maintenance
Cross-browser and cross-device testing
Cloud-based test execution with TestCloud
Integration with 60+ development tools
Advanced analytics and reporting with TestOps
Parallel test execution for faster results
Free version available with unlimited tests
Use Cases of Thunder Client and Katalon
Pricing of Thunder Client and Katalon
Thunder Client offers flexible pricing to match different needs. The Free plan gives you the extension with 30 collection runs and basic features, but it is limited to personal, non-commercial use only.
The Individual plan costs $49 per year and includes 100 collection runs, advanced scripting, request chaining, and access to WebSocket, SSE, and gRPC testing. This plan works well for freelance developers.
For teams, the Business plan is $7 per month per user and includes 500 collection runs, team features, CLI integration, and the ability to pay by invoice.
The Enterprise plan at $16 per month per user offers unlimited collection runs, priority support, offline activation, encrypted environments, secrets manager integration with Azure and AWS, and enterprise single sign-on capabilities.
Katalon offers flexible pricing plans to match different team needs and testing requirements.
Free Plan: The free version provides unlimited basic testing with Katalon Studio. You get access to test creation, local execution, community support, and training courses at no cost. Perfect for individuals and small teams starting their automation journey.
Create Plan ($229/month or $2,199/year): Includes Studio Enterprise with advanced features, AI-powered testing, self-healing functions, and 24/5 support. New customers can get a promotional rate of $1,000 per year for up to 3 licenses.
Expand Plan ($426/month or $4,098/year): Adds flexible execution with Runtime Engine or TestCloud for running tests in any environment. Perfect for teams scaling their testing operations.
Scale Plan (Custom pricing): Enterprise-level plan with TestOps for centralized test management, TrueTest for AI-generated tests, private cloud deployment, dedicated support, and strategic services. Contact sales for pricing based on your needs.
FAQs: Thunder Client vs Katalon
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Open Source API Testing Tool for Fast Development
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Affordable API Testing & Monitoring Platform for Developers
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