Empowering Champions
Accessibility professionals are built
The inclusive web is built together
The belief that access to information is a human right is at the very core of Tamman. We are a full service consulting practice that blends an approach of inclusive design principles with your business’ strategic priorities, to meet the accessibility needs of your organization. There are sound business cases to make for ensuring web and mobile applications are accessible to all consumers, employees, and the public from the outset.
Why Accessible Digital Solutions Matter?
Drives Innovation


Accessibility features in products and services often solve unanticipated problems. Innovations like the typewriter, telephone, punch cards, text to speech, email, and voice controls were initially meant to include those with a disability, and all have found a much broader application in the marketplace. The web is no different. What is necessary for a few is beneficial for all.
Minimizes Legal Risk


Many countries have laws requiring digital accessibility, and the issue is of increasing legal concern. turns out, doing the right thing also diminishes your exposure to potential legal challenges down the road.
Enhances Your Brand


Diversity and inclusion efforts, which are important to most brands on their own, are accelerated when users engage with a clear, well-integrated accessibility commitment.
Extends Market Reach


The global market of people with disabilities is over 1 billion people with a spending power of more than $6 trillion. In addition, accessibility efforts often improve the online experience for all users. Happy customers and happy productive employees are both more likely to be retained through thoughtful inclusive design.
360° Collaboration
A joint venture
The Sierra Group–Tamman 360 collaborative creates a one-stop shop for your Diversity Equity & Inclusion, Human Resources, Legal, Marketing, and Technology needs. No other venture offers this one of a kind 360-degree comprehensive approach for your company’s accessibility needs.
Accessible Digital Solutions, Always
We offer a wide range of services to meet any digital accessibility goals. Tamman’s experienced accessibility evangelists and developers can provide immediate help desk services, remediation, or build completely custom web applications. From one-off engagements to long-term partnerships and everything in between, our consultants and technologists are here to support you.
Learning Center
Resources that drive innovation
Tamman is built around the belief that access to information is a human right. We believe in blending inclusive design principles with your business strategies to empower accessibility champions, implement effective digital solutions, and create a lasting impact.