Sightline raises $12M to bring semantic accessibility overlays to websites

Design · 4 min read

Sightline launched out of stealth today with a product that automatically identifies UI patterns in web apps and generates accessibility artifacts, including ARIA attributes, keyboard navigation schemas, and contextual alt text. The company says its models, trained on a combination of public data and annotated enterprise flows, can reduce manual remediation time by over 70 percent for single-page applications.

The $12 million seed was led by A16Z, with angels from top UX leaders and accessibility-focused VCs. Funds will support scaling the model's training dataset, building an enterprise admin console, and integrating with design systems and CI pipelines to catch regressions pre-release.

Sightline positions its overlay as a developer-first tool that exports code suggestions rather than a black-box patch, allowing teams to vet changes and incorporate them into their workflows. Early pilots with fintech and e-commerce platforms saw improved screen reader compatibility and faster turnaround on accessibility audits.