HeaderX
Developer Tools
Free
Inject custom HTTP request headers in Safari. JSON config, reusable profiles, one-tap toggle. Built for developers testing APIs, debugging apps, and switching envs.
HeaderX injects custom HTTP request headers into your Safari browsing session — the essential companion for web developers, API testers, and QA engineers.
Point HeaderX at your development environment, define your headers once, and flip them on whenever you need them. No proxy setup, no configuration files, no leaving the browser.
DEFINE HEADERS AS JSON
Describe your headers in a simple JSON editor — paste an entire set at once:
{"X-Debug-Mode": "enabled", "Authorization": "Bearer dev-token"}
Or use the array format to keep headers saved but individually switched off.
TWO VIEWS, ONE TOGGLE
Edit as raw JSON or flip to List view, where every header gets its own checkbox. The master toggle in the corner turns everything on or off instantly — your configuration stays saved either way.
REUSABLE PROFILES
Save named header sets — one per project, environment, or test scenario — and switch between them in two clicks.
FEATURES
• One-tap master toggle
• JSON editor and checkbox list views
• Per-header enable/disable
• Named profiles for quick switching
• Settings persist across browser restarts
• Works in Private Browsing (optional)
GOOD TO KNOW
Standard header names (Authorization, Accept-Language, User-Agent, and other HTTP-spec headers) are applied to all requests through Safari's native rule engine. Custom header names (X-My-Header and similar) are applied to fetch and XHR requests made by web pages — a Safari platform constraint on custom names in network rules. For typical API-debugging workflows, this covers exactly the requests you care about.
Headers apply to every site while the toggle is on — remember to switch off when you're done testing, especially with authentication headers.
PRIVACY FIRST
Everything stays on your device. HeaderX collects no data, phones home to no one, and contains no analytics. What you configure is nobody's business but yours.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Edit headers in place. Each header in the list now has an Edit button — change its name or value right in the list, without switching to the JSON view. Enter saves, Escape cancels, and duplicate or empty names are caught before saving.
The developer, Gyuman Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Gyuman Kim
- Size
- 1.3 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 10.14 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Chester Kim