UD5 Toolkit
Canning Lid Seal Tester β Online Visual & Sound Check
Interactive guide: press the center, tap with a spoon. Confirm if your Mason jar sealed correctly.
Online Testers & Validators
9+ toolsKeyboard Accessibility Tester β Online Check Tab Order
Paste HTML snippet and see calculated tab order. Identify missing focusable elements. A11y helper.
Screen Reader Text Preview - Online See Hidden A11y Labels
Enter HTML with aria-labels and see what a screen reader would announce. Simulates common patterns. Local educational tool.
CSS Media Query Range Tester β Online Width/Height Debug
Paste media queries and see a visual indicator of which rules apply at current viewport size.
Tab Focus Order Checker - Online Visualize Tab Navigation Flow
Paste HTML and see the order in which elements would receive focus via Tab key. Highlight issues. Local accessibility testing.
Live Page Color Blindness Check β Online Enter URL
Enter a website URL and apply a protanopia/deuteranopia/tritanopia filter. Test full page accessibility.
SQL JOIN Temperature Tester - Online Quick Join Syntax Checker
Quickly test SQL JOIN syntax (INNER, LEFT, RIGHT, FULL) with a sample database schema. Check logic and see conceptual result set without a real DB. Local only.
Subwoofer Phase Tester β Online Audio Check
Play low-frequency tones to check subwoofer phase alignment with main speakers. Simple tool.
Speaker Polarity Test β Online Click & Listen
Generate a pop signal to determine if speakers are wired in phase. Quick stereo test.