Walnut: Webview Debug & Test
Walnut: Webview Debug & Test Summary
Walnut: Webview Debug & Test is a mobile iOS app in Developer Tools by Jiwon Park. Released in Dec 2025 (2 months ago). Store metadata: updated Feb 5, 2026.
Store info: Last updated on App Store on Feb 5, 2026 .
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App Description
The ultimate developer tool for testing WKWebView and SFSafariViewController configurations in real-time.
KEY FEATURES
WKWebView Testing
• Real-time configuration testing with 20+ options
• Built-in DevTools: Console, Network, Storage, Performance, Sources, Accessibility
• JavaScript injection and snippet execution
• Custom User-Agent emulation
• Viewport and device emulation
SFSafariViewController Testing
• Native Safari experience with content blockers
• Reader mode and responsive size control
• Customizable bar colors and dismiss button styles
Developer Tools
• Console: Capture console.log with %c CSS styling support
• Network: Monitor fetch/XHR requests with timing data
• Storage: View/edit localStorage, sessionStorage, cookies
• Performance: Web Vitals (LCP, FID, CLS) and Navigation Timing
• Sources: DOM tree inspection, stylesheets, scripts
• Accessibility: axe-core based accessibility auditing
Additional Features
• Bookmark management for quick URL access
• Responsive viewport resizing (iPhone, iPad, Desktop presets)
• Screenshot capture
• API capability detection
• Dark mode support
Perfect for iOS developers who need to test web content rendering, debug JavaScript, analyze network requests, and ensure accessibility compliance.