UD5 Toolkit
Advanced Color Contrast Matrix – Test All Pairs in Palette
Paste a list of hex colors and see a grid showing the contrast ratio for every combination. Instantly identifies which pairs pass WCAG AA/AAA.
Accessibility Tools - Inclusive Design
84+ toolsText Contrast Validator - Online WCAG AAA Checker
Enter a text color and background color and instantly see if the combination passes WCAG AA and AAA ratio. Safe colors.
Skip Navigation Link Generator - Online A11y Helper
Create a properly styled 'Skip to Content' link. Customize target and appearance. Essential for keyboard users. Copy the HTML/CSS.
Colorblind‑Safe Palette Creator - Online for Data Viz
Generate a palette of N colors that are maximally distinguishable for common color vision deficiencies. Copy the hex codes.
Accessible Color Pair Grid - Online WCAG Matrix for Vision Deficiencies
Enter foreground and background colors and see a matrix of how each pair works for normal, protanopia, deuteranopia, and tritanopia.
Color Contrast Ratio Tester - Online WCAG AA/AAA Check
Enter foreground and background colors to instantly see the contrast ratio and pass/fail for AA and AAA. Simple and fast.
Accessible Color Contrast Matrix – Online Paste Palette & Check
Paste hex colors, generate a contrast matrix against each other. Identify failing pairs for WCAG.
Hex Contrast Grid – Online Test All Pair Combinations
List up to 10 colors and generate a contrast ratio matrix. See which pairs pass WCAG quickly.
Image Alt Text Linter - Online Check Missing & Redundant Alts
Paste an HTML snippet and get a report on missing, empty, or suspicious alt texts. Improve your image SEO and a11y.
Speech Dispatcher Tester - Online Explore All Voices
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
Focus Outline Styler - Online Design Accessible Rings
Design a custom focus indicator with outline, offset, and box‑shadow. Preview on interactive elements. Copy the CSS.
Accessible Color Scale Builder - Online Generate Tints/Shades with Contrast
Pick a base color and generate a 10‑step scale where each step meets a specific contrast ratio against white or black. Export as CSS custom properties.
Bulk Color Contrast Checker - Online WCAG Validation
Paste a list of foreground/background color pairs and instantly see which pass AA/AAA. Perfect for checking entire style guides.
Focus Indicator Designer – Online CSS Outline Generator
Visually design a custom :focus‑visible outline style. Copy the CSS. Better than the default.
Gradient Text Contrast Checker – Online WCAG Over Background
Type text and set a gradient, then check contrast against a solid background. Ensure readability.
Live Page Color Blindness Check – Online Enter URL
Enter a website URL and apply a protanopia/deuteranopia/tritanopia filter. Test full page accessibility.
Keyboard Accessibility Tester – Online Check Tab Order
Paste HTML snippet and see calculated tab order. Identify missing focusable elements. A11y helper.
Colored Overlay Simulator – Online Tinted Reader
Apply a color tint overlay over text to see if it helps reading comfort. Trial for visual stress.
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.
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.
aria‑hidden Conflict Finder - Online A11y Audit
Paste HTML and detect elements with aria‑hidden='true' that contain focusable children. An easy a11y win to fix.
Dialog Focus Manager Demo - Online A11y Trap & Restore
Open a modal and see how focus is trapped and restored. Copy the lightweight focus‑trap code. Accessible pattern.
WCAG Safe Palette Builder - Online Accessible Color Sets
Start with a base color and generate an extended palette where every shade contrasts properly with white and black. Export tokens.
Random Accessible Palette Generator - Online WCAG Safe
Generate a random 5‑color palette where every adjacent pair passes WCAG AA contrast. Safe for inclusive designs.
Gradient Color Blindness Simulator - Online Test Palettes
Upload a gradient or enter a palette and simulate how it appears with different types of color vision deficiency. Ensure inclusive data visualization.
Real‑Sample Contrast Checker - Online See Paragraph
See how a full paragraph looks with your chosen text and background colors. Not just a ratio; the real appearance.
Skip Link Validator - Online See Bypass Blocks
Check if your site has a visible and functional skip navigation link. Key for keyboard‑only users.
Accessible Form Builder - Online Semantic HTML Generator
Create a fully accessible form by adding fields; the tool generates the proper labels, inputs, and ARIA attributes. Copy the clean HTML.
:focus‑visible Tester - Online Keyboard‑Only Focus Ring
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
ARIA Label Checker – Online Paste HTML Search for Missing Labels
Paste HTML snippet and highlight interactive elements missing accessible labels. Quick a11y audit.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for basic transcription. All local.
ARIA Graphics Roles Validator - Online Check SVG a11y
Paste an SVG and check if the graphic‑aria roles are used correctly. Improve accessible diagrams and icons.
ARIA Live Region Monitor - Online See Dynamic Announcements
Watch for updates to aria‑live regions and log what a screen reader would announce. Debug live regions.
Speech Utterance Tester - Online Play Word by Word
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Tab Order Visualizer - Online See Focus Navigation Path
Enter a URL and see a visual map of the tab order. Detect broken tabindex values. Improve keyboard navigation.
Screen Reader Text Simulator - Online See What It Says
Enter an HTML snippet and see a rough transcription of what a screen reader might announce. Check alt texts.
Screen Reader Text Visualizer - Online View Hidden A11y Content
Paste a website's HTML and see which text is only visible to screen readers (e.g., .sr‑only). Preview the accessible layer.
Reduced Motion Demo - Online Prefers‑Reduced‑Motion Switcher
Toggle between full and reduced motion on a live animated page. See how to design for vestibular disorders. Educational.
Enhanced Color Blindness Simulator - Image & UI Combined
Upload an image and also see a UI mockup under different deficiencies side‑by‑side. Powerful for inclusive design.
ARIA Live Region Tester - Online Screen Reader Update
Inject dynamic messages into ARIA live regions and monitor how they trigger screen reader announcements. Debug a11y.
Text to Speech Reader - Online Listen to Any Text
Paste or type text and have it read aloud with natural voices. Control speed and pitch. Uses browser's built‑in TTS.
aria‑describedby Visualizer - Online Check Descriptions
Highlight elements with aria‑describedby and see the linked description text. Verify a11y annotations.
HTML lang Validator - Online Check Language Tag
Validate a language tag like en‑US or zh‑Hans against the IANA registry. Ensure correct HTML lang attribute.
:focus‑visible vs :focus Demo - Online Accessible Outlines
See the difference between :focus and :focus‑visible on interactive elements. Learn which to use for better UX.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for transcription (limited). All local.
Screen Reader Text Optimizer - Online Improve Alt & Link Text
Analyze text for screen reader friendliness: detect vague link text, missing alt suggestions. Get a report. Local.
Custom Focus Ring Styler - Online CSS :focus‑visible Designer
Design a custom focus indicator with outline, offset, and box‑shadow. Preview on interactive elements. Copy the CSS.
Braille Alphabet Trainer - Online Learn Dot Patterns
Flashcards for learning Braille. See the dot pattern and type the letter. Track your speed and accuracy. Accessibility education.
prefers‑contrast Tester - Online High/Low Contrast Emulator
Force more or less contrast and see how your page adapts. Test your CSS media queries for accessibility.
prefers‑reduced‑motion Tester - Online A11y Check
Simulate reduced motion preference and test your animations. Copy the media query snippet. Keep your users safe.
Alt Text Suggestion Tool - Online Image Description Generator
Upload an image and get a suggested alt text description using a local vision model (WASM). Improve SEO and accessibility fast.
Live Site Contrast Checker - Online Audit By URL
Enter a URL and fetch its text/background colors to perform a bulk contrast check. See warnings for WCAG violations.
SSML Marker Demo - Online TTS Events & Highlights
Use SSML <mark> tags to fire events during TTS. See text highlighted as it is spoken. Understand speech synthesis timing. local.
forced‑colors Mode Tester - Online Windows High Contrast
Simulate forced‑colors mode and see how your site looks. Adjust CSS system colors. Make your design accessible.
ARIA Attribute Validator - Online Check HTML Accessibility
Paste an HTML snippet and check for common ARIA mistakes: missing labels, invalid roles, and aria‑hidden misuse. Educate your team.
<abbr> Tag Generator - Online HTML Abbreviation Builder
Type an abbreviation and its full form to get the proper `<abbr title='...'>` HTML. For accessible markup.
Colorblind-Safe Palette Builder - Online Check & Generate Schemes
Build a palette and simulate how it appears to various color deficiencies. Also generate pre-vetted accessible palettes. Local processing.
Heading Structure Visualizer - Online Document Outline Check
Paste an URL or HTML and see the h1‑h6 hierarchy as a tree. Detect skipped levels and improve accessibility. Client‑side.
Speech Live Counter - Online Count Spoken Words
Speak into the mic and see a live transcript with word count. Uses the Web Speech API. Nothing is stored.
APCA Contrast Checker - Online New Accessible Perceptual Contrast
Check the Accessible Perceptual Contrast Algorithm (APCA) ratio. The next‑generation contrast method for WCAG 3.