Free Online Accessibility Tools for Web Developers and Designers

Web accessibility is an important part of building websites and digital products that people can actually use.

Developers and designers regularly need to check things such as color contrast, alternative text, heading structure, keyboard navigation, form labels, focus states, and touch targets.

However, accessibility is not just about running one automated checker. Different parts of a website require different types of checks, and some accessibility issues can only be identified through manual testing and real user interaction.

To make these smaller tasks easier, Noloii has a collection of free browser-based accessibility tools covering common accessibility, WCAG, UI, HTML, content, and usability checks.

👉 Explore all Free Accessibility Tools

Accessibility Tools Available

Here are the current tools in the collection.

Color and Visual Accessibility

• Color Contrast Checker — Check foreground and background color combinations against WCAG-related contrast requirements.

• Contrast Ratio Calculator — Calculate the contrast ratio between two colors and understand the result.

• Accessible Color Palette Generator — Generate color combinations designed to provide better readability and contrast.

• Color Blindness Simulator — Preview colors and designs under different forms of color vision deficiency.

These tools can be particularly useful when designing dashboards, websites, data visualizations, buttons, navigation systems, and other interfaces where color plays an important role.

For example, a design may look perfectly readable to its creator but become difficult to distinguish when two colors have insufficient contrast.

WCAG and Accessibility Testing

• WCAG Accessibility Checker — Analyze webpages for common accessibility issues and identify areas that may need further review.

Accessibility checkers can be useful during development and QA because they can help identify detectable problems before a website is published.

However, an automated result should not be treated as proof that a website is completely accessible.

Accessibility can depend on context, content, interaction behavior, keyboard navigation, assistive technologies, and the actual experience of users.

Images and Alternative Text

Images are another important part of accessible web content.

• Alt Text Generator & Helper — Create clear and descriptive alternative text for images.

• Accessible Image Checker — Check images for alternative text and other common accessibility-related HTML attributes.

Good alternative text should communicate the relevant purpose or meaning of an image rather than simply describing every visible detail.

For example, a decorative image may not need the same type of alternative text as an image that communicates important information.

These tools can help during content publishing, web development, SEO reviews, and accessibility QA.

HTML Structure and ARIA

Good accessibility also depends on how information and interactive controls are structured.

• Heading Structure Checker — Analyze H1 through H6 headings and review document hierarchy.

• ARIA Label Generator — Generate practical ARIA labels for suitable buttons, links, icons, and other interface controls.

Heading structure is useful for organizing content into meaningful sections, while accessible names help users understand interactive controls.

When working with ARIA, semantic HTML should generally be preferred whenever an appropriate native HTML element already exists. ARIA should complement good HTML rather than replace it.

Forms and Keyboard Accessibility

Forms and interactive interfaces can introduce accessibility problems that are easy to overlook.

• Form Accessibility Checker — Review common form accessibility considerations such as labels, inputs, required fields, and errors.

• Keyboard Accessibility Checker — Check whether interactive webpage elements can be accessed and operated through keyboard navigation.

• Focus Indicator Checker — Evaluate whether keyboard focus remains visually identifiable.

Keyboard accessibility is especially important because not every user navigates a website with a mouse.

A useful manual test is simple:

1. Open the webpage.
2. Put your mouse aside.
3. Use Tab to move through interactive elements.
4. Use Shift + Tab to move backward.
5. Check whether the focus position is always visible.
6. Try interacting with buttons, links, menus, forms, and other controls.

Automated tools can assist with this process, but actual keyboard testing remains valuable.

Readability and Mobile Accessibility

Accessibility also includes how easily people can read and interact with content.

• Text Readability & Spacing Checker — Review text size, line height, spacing, and other readability-related factors.

• Touch Target Size Checker — Check buttons and interactive controls against recommended touch-target dimensions.

Small buttons, crowded controls, poor spacing, or difficult-to-read text can create problems for users on both desktop and mobile devices.

This is especially relevant for navigation menus, forms, mobile applications, dashboards, and responsive websites.

Accessibility Planning and QA

• Accessibility Checklist Generator — Generate a practical accessibility checklist covering areas such as WCAG, content, design, keyboard access, forms, and usability.

A checklist can be useful before launching a website or during a development sprint.

For example, a team might review:

• Color contrast
• Alternative text
• Heading hierarchy
• Form labels
• Keyboard navigation
• Focus indicators
• Semantic HTML
• ARIA usage
• Text readability
• Touch targets
• Error messages
• Interactive controls

The exact checklist should depend on the website, application, audience, and applicable accessibility requirements.

A Simple Accessibility Workflow

A practical accessibility workflow does not need to be complicated.

1. Identify the problem

First determine what you are trying to evaluate.

Is it color contrast?

An image?

A form?

Keyboard navigation?

Heading structure?

Text readability?

2. Choose the appropriate tool

Use a focused tool for the specific task.

For example, use the Color Contrast Checker for color combinations rather than trying to use a general accessibility checker for everything.

3. Provide the required input

Depending on the tool, this could be:

• Colors
• Text
• HTML
• Image information
• Webpage information
• Accessibility settings

4. Review the result

Treat the result as a diagnostic aid rather than an absolute certification.

5. Make improvements

Update the website, design, content, HTML, or interaction behavior based on the findings.

6. Test again

After making changes, repeat the relevant checks.

For important websites, also perform manual testing and, where appropriate, testing with assistive technologies.

Why Accessibility Tools Are Useful

Developers and designers don't always need a large accessibility platform for every small task.

Sometimes the task is simply:

• "Is this text color readable?"
• "Does this image have useful alt text?"
• "Are my headings structured correctly?"
• "Can I navigate this interface with a keyboard?"
• "Is the focus indicator visible?"
• "Are these touch controls large enough?"
• "Does this form have appropriate labels?"
• "Does this color palette work for users with color vision deficiency?"

A focused browser-based utility can make these individual checks easier to perform during development and design.

The goal is not to replace accessibility knowledge or professional testing. The goal is to make common checks more convenient.

Accessibility and SEO

Accessibility and SEO are not the same thing, but they can overlap in several areas.

For example, both accessible design and search-friendly websites can benefit from:

• Meaningful headings
• Descriptive text
• Semantic HTML
• Well-structured content
• Useful alternative text
• Clear navigation
• Good page usability

However, accessibility should not be treated simply as an SEO technique.

The primary goal of accessibility is to make digital experiences more usable and inclusive.

SEO and accessibility can support each other, but they solve different problems.

Accessibility Tools for Different Roles

Web Developers

Developers can use accessibility tools while working with HTML, CSS, forms, ARIA, keyboard navigation, images, and interactive components.

UI/UX Designers

Designers can check color combinations, typography, focus states, touch targets, and visual accessibility during the design process.

Website Owners

Website owners can use focused checks to better understand common accessibility issues on their websites.

Content Creators

Content teams can use tools for alternative text, readability, headings, and accessible content preparation.

SEO Professionals

SEO professionals can review page structure, headings, images, and other accessibility-related aspects that can contribute to a more usable website.

Students and Learners

These tools can also be useful for learning concepts such as WCAG, contrast ratios, semantic HTML, ARIA, keyboard accessibility, and accessible design.

Accessibility Tools Are Not a Guarantee of Compliance

One important point is worth emphasizing:

Passing an automated accessibility check does not automatically mean that a website is fully accessible or WCAG compliant.

Automated tools are good at detecting certain measurable or predictable problems.

But they cannot understand every aspect of:

• Content meaning
• User context
• Interaction design
• Keyboard behavior
• Visual clarity
• Accessibility of complex components
• Screen reader experience
• Assistive technology behavior

For important websites and applications, automated checks should be combined with manual testing and, when appropriate, testing with assistive technologies and real users.

Explore the Full Accessibility Collection

If you are building websites, designing interfaces, creating content, or learning web accessibility, you can find the complete collection here:

👉 Free Accessibility Tools — Noloii

The collection brings together focused tools for WCAG, color contrast, accessible colors, color vision simulation, alt text, images, ARIA, headings, forms, keyboard navigation, focus indicators, readability, touch targets, and accessibility checklists.

The goal is simple: make common accessibility tasks easier to check and understand directly from the browser.

If you find a useful accessibility workflow or have an idea for another practical accessibility tool, sharing feedback can also help improve future versions of the collection.