Best Debugging Products in 2026

Fiddler is a debugging program for websites.

Key Fiddler features:

Comprehensive Debugging Cross-Platform Compatibility Custom Scripting User-Friendly Interface

Ensure healthy website performance, uptime, and free from vulnerabilities. Automatic checks for SSL Certificates, domains and monitor issues with your websites all from one console and get instant notifications on any issues.

Key Netumo features:

Monitoring SSL Monitoring Twitter SMS notifications

Try for free freemium $9 / Monthly (Lite plan)

HTTP proxy / HTTP monitor / Reverse Proxy.

Key Charles Proxy features:

Comprehensive HTTP/HTTPS Debugging User-Friendly Interface Support for Various Platforms Throttling Feature

Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.

Key Proxyman.io features:

User-Friendly Interface Cross-Platform Support Real-time Traffic Interception HTTPS Decryption

Open Source $49 / Annually

14-in-1 browser extension developers and designers love.

Key SuperDev Pro features:

CSS Inspector Live Text Editor Fonts Changer List All Fonts

freemium $60 / One-off

From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.

Key Sentry.io features:

Real-time error tracking Detailed error reports Integrations Releases and version tracking

Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.

Key HTTP Toolkit features:

Ease of Use Cross-Platform Compatibility Open Source Comprehensive Debugging Features

Open Source freemium €7 / Monthly (for a Pro subscription)

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 / Monthly

The Collaboration Platform for API Development.

Key Postman features:

User-Friendly Interface Collaboration Comprehensive Testing Tools Extensive API Documentation

Open Source

Behavior-Driven JavaScript.

Key Jasmine features:

Behavior-Driven Development No Dependencies Comprehensive API Built-in Mocking

Open Source

ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.

Key ngrok features:

Ease of Use Security Speed of Setup Flexibility

Open Source

Spectacular Test Runner for JavaScript.

Key Karma features:

Easy Integration Real-time Testing Wide Browser Support Extensible

Open Source

Unleash AI on Your Code Reviews with CodeRabbit.

Key CodeRabbit features:

Efficiency Collaboration User-Friendly Interface Integration Capabilities

Open Source

RequestBin.com gives you a URL that collects requests you send to it so you can inspect them in a...

Key RequestBin features:

Ease of Use Real-time Monitoring No Setup Required Privacy and Security