Enhance your website with Sienna

Yes. The core widget — all visual accessibility tools — is free with no time limit, no trial, and no registration required. Revenue comes from donations and optional paid plans (custom branding, white-label). The free tier will never be paywalled.

Sienna is built and maintained by a single independent developer, Benny Luk. There is no VC funding, no sales team, and no aggressive growth targets. This is open-source software built by someone who cares about the web. If you use Sienna and find it valuable, you can support the project on Buy Me a Coffee.

No. Add one script tag to your site and it works. There is no email address, no password, and no dashboard to sign into. This is intentional — we believe zero-registration is a core accessibility value.

Yes. Sienna does not set any cookies, tracking pixels, or fingerprints. The widget runs entirely client-side inside your visitor's browser — no data is sent back to our servers. Because we don't process personal data, there's no GDPR consent requirement to display the widget. Read our full guide: GDPR & Privacy Compliance.

The Sienna script is hosted on **jsDelivr**, a globally distributed, open-source CDN with Tier-1 performance. It is explicitly designed for high-compliance environments, meeting the requirements of **GDPR (Europe)**, **UK-GDPR**, and **CCPA/CPRA (California)**. jsDelivr uses a zero-tracking architecture, meaning no cookies are set and no personal data is stored, ensuring your site remains aligned with international privacy laws while maintaining fast load times. Read our Privacy Guide.

jsDelivr is one of the world's most trusted open-source CDNs. It's GDPR-compliant, serves assets from the nearest edge node globally, and provides publicly verifiable download statistics. Using it means you can verify our adoption numbers yourself — no inflated marketing metrics.

No. Sienna is an assistive User Interface layer. It enhances the experience for visitors by providing tools like contrast adjustments, text resizing, and focal enhancements immediately. However, it does not rewrite your underlying source code to fix structural issues (like missing ARIA labels). No overlay can replace a proper structural audit.

Sienna addresses the User Interface layer of WCAG compliance: contrast (1.4.3), text resizing (1.4.4), motion suppression (2.2.2), and focus visibility (2.4.7). True full compliance also requires structural work — semantic HTML, alt text, keyboard logic. Sienna is your fast-track foundation, not a complete replacement for an audit. Read our WCAG guide.

Yes. The ADA references WCAG as the technical standard for web accessibility. By addressing several key WCAG criteria, Sienna demonstrates a good-faith effort to provide reasonable accommodations — which is the ADA's core requirement. Read our ADA guide.

All of these frameworks are built on or aligned with WCAG 2.1 Level AA. By addressing the same underlying criteria, Sienna helps satisfy each of them. We have dedicated guides for Section 508, AODA, EN 301-549, and EAA 2025.

Because Sienna never touches, stores, or transmits health records or children's personal data — and runs entirely in the browser — it is safe to use on healthcare and education platforms that must comply with HIPAA and COPPA/FERPA. Read our Healthcare guide.