Building Accessible Apps for Tonal Languages: The Unicode Normalization Solution

Hundreds of millions of people use languages with diacritical marks—like Yorùbá's tone-dependent variations—yet most global apps default to English keyboards, making them functionally inaccessible to these language communities. The author demonstrates how Unicode normalization techniques enable seamless search and sorting across tonal languages without requiring custom keyboards, revealing a critical gap in global software design. This practical approach is essential for developers committed to genuine digital inclusion and offers a blueprint for making apps truly work across the world's linguistic diversity.