Curb-Cut Effect

The curb-cut effect is the observation that designs created for people with disabilities tend to benefit everyone. It is named after kerb ramps, which were cut into pavements for wheelchair users and now help anyone with a pram, a suitcase, or a delivery trolley.

The digital versions are everywhere. Captions were for deaf users and are now used by anyone watching video on mute. Plain language was for people with cognitive differences and now helps a tired, distracted reader on a phone. Larger touch targets, clear error messages, and predictable navigation all started as accessibility fixes and became general usability wins.

The practical lesson for a product team is that the edges of your audience are an early-warning system for the centre. Friction that blocks a neurodivergent user usually slows a neurotypical one too; they just tolerate it silently.

This is why testing with a more sensitive cohort is a usability strategy, not only an inclusion one. Fix what blocks the edges and task success rises across the whole audience.