
ModHeader
Modify HTTP request and response headers directly from your browser for web development and debugging.
Updated: March 2026
Professional tools for marketing, design, and creative agencies. Manage clients, projects, and deliverables at scale. We've curated 15 tools specifically suited for agencies.

Modify HTTP request and response headers directly from your browser for web development and debugging.

Find inspiration with evocative visuals, curated art, and quotes from history's brightest minds.

Make AI safe for work by instantly protecting sensitive data in your AI interactions.

Virtual ring light browser extension to enhance your appearance in video calls.

Analyze the size and performance cost of npm dependencies for your JavaScript bundle.

Automate browser tasks with AI, turning instructions into actions.

Automate browser tasks with a powerful, scalable, and secure headless browser API.

Serverless browsers for AI agents and applications to autonomously interact with the web.

Boost your website's SEO, speed, and security with comprehensive auditing.

Unlock granular control over YouTube video playback speeds, from 0.25x to 16x, with native integration.

Automate web app testing 3x faster with an intuitive low-code test automation tool.

Send screen nudges to friends across popular web apps to grab their attention.

Unlock Japanese by learning kanji directly from manga and novels through an immersive browser extension.

The quickest way to fill all inputs on a page with fake data for testing forms.
Based on our analysis, ModHeader is the top choice for agencies, with a score of /100.
Yes! ModHeader, Sapiare New Tab, Chromedp offer free plans suitable for agencies.