How to build a custom spell-checker extension

2026-02-19 · Source: How I AI · Field: Technology & Digital — Software Development & Engineering, Artificial Intelligence & Machine Learning · Depth: Intermediate, quick

Summary

A new, screen reader-accessible spell checker has been developed that operates directly within any web input field. Unlike existing tools that often require multiple clicks or lack accessibility, this solution integrates seamlessly into a user's workflow. The tool sends user input to OpenAI for correction, providing audio feedback such as "processing spell check" and "spell check complete" to screen reader users. This allows individuals to focus on content creation without immediate concern for typos, knowing they can quickly correct errors before sending messages. The underlying prompt is specifically designed to only correct typos, preserving the original content's wording.

Key takeaway

For developers building web applications, consider integrating direct, accessible tools like this spell checker to significantly improve user experience for those relying on screen readers. Your focus should be on creating seamless workflows that minimize clicks and provide clear, real-time feedback, ensuring inclusivity and efficiency in content creation.

Key insights

An accessible, integrated spell checker enhances efficiency and user experience for screen reader users.

Principles

• Accessibility drives utility
• Efficiency through integration

Method

The spell checker sends user input to OpenAI with a focused prompt to correct only typos, then returns the corrected text, providing audio feedback for screen reader users.

In practice

• Integrate AI for accessibility
• Use specific prompts for tasks

Topics

• Spell Checking
• Screen Reader Accessibility
• OpenAI API
• Web Applications

Best for: Software Engineer, AI Engineer, Prompt Engineer

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Editorial summary, takeaway, and curation by AIssential. Original article published by How I AI.