Accessibility Statement

BillionToOne is committed to providing a fully accessible website experience for all users of all abilities, including those who rely on assistive technologies like screen readers, screen enlargement software, and alternative keyboard input devices to navigate the web.

Ongoing Efforts to Ensure Accessibility

We follow the Web Content Accessibility Guidelines (WCAG) version 2.1 as our guiding principle for determining accessibility, with some exceptions. These are internationally agreed-upon standards that cover a wide range of recommendations and best practices for making content useable. As we add new pages and functionality to our website, all designs, code, and content entry practices are checked against these standards.

At the time of launch, our website was tested for WCAG 2.1 Level AA compliance. Testing of our website was performed by team members using industry-standard tools such as the Accessibility Checker WordPress Plugin, color contrast analyzers, keyboard-only navigation techniques, and Flesch-Kincaid readability tests.

Accessibility Features On Our Website

The following is a list of items we have included on our website to improve its accessibility:

  • Our website design has a mobile-responsive version with appropriately sized tap-targets.
  • Navigational aids are provided on all pages. Skip navigation links have been incorporated to facilitate keyboard navigation and to bypass content on a page, allowing users to jump directly to the primary navigation, main content, and footer.
  • Our website declares a language in the header.
  • Images and other non-text elements have appropriate alternative text associated with them.
  • Structural markup to indicate expected section containers, headings, lists, and buttons has been provided to make our content more understandable and “skim-able” by all users, regardless of device.
  • Forms are associated with labels and instructions on filling in forms are available, along with clearly understandable error states.
  • Accessible Rich Internet Applications (ARIA) screen-reader-only text is present when links, buttons, icons, or images require additional context to understand their meaning.
  • A warning is provided before links open in a new tab or window.


The following are areas where BillionToOne’s website may not meet Web Content Accessibility Guidelines:

  • Color contrast
  • Accurate captions on videos
  • Use of animations
  • Accessibility of PDF documents and accreditation information

External Platforms

The BillionToOne website integrates with some external platform(s) to deliver functionality to its users. Here is a list of those platform(s) and accompanying notes on their accessibility:

  • Greenhouse: BillionToOne job applicants are required to apply on Greenhouse. Greenhouse is working towards conforming with WCAG 2.0 and that they continue to perform audits and make improvements to accessibility on an annual basis. If an applicant with disabilities is unable to apply via Greenhouse, please reach out to our accessibility support contact listed on this web page.
  • MailChimp: This is BillionToOne’s email marketing platform of choice. MailChimp’s parent company Intuit has a public page describing its approach to accessibility. View Intuit’s accessibility policy and documentation.

As part of our broader effort to make everyone’s experience with BillionToOne a welcoming and enjoyable one, we will update this list of exceptions and exclusions periodically. Please note that while we make every effort to provide information accessible to all users, we cannot guarantee the accessibility of third-party websites to which we may link.

Accessibility Support Contact

We welcome comments, questions, and feedback on our website. If you are using assistive technologies and are having difficulty using our website, please email [email protected] or give us a call at (650) 460-2551. We will do our best to assist you and resolve issues.