Making things better
Addition creates unique digital experiences that connect people with your brand or mission. And we design, build and host best-in-class products to help charities raise more money.

Featured Experiences

Some of the unique digital experiences we have crafted in collaboration with our clients.

British Heart Foundation

Gift of Hope / Give in Celebration
We worked with British Heart Foundation to radically overhaul their in memoriam and in celebration destinations to meet the needs of a growing market.
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Macmillan Cancer Support

The Source
Using rigorous research and rapid prototyping techniques, together we created The Source: a user generated hub of practical tips for people who know someone with cancer.
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Featured products

We specialise in creating best-in-class digital products for charities.


Tribute fund product
inMem is the result of 5 years’ experience creating tribute/in memory funds for leading UK charities, via a variety of platforms. We felt none provided what clients need today, so we applied some Product Thinking and made our own.
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Enterprise platform

Donation journeys
With extensive experience in maximising online giving for leading charities, our donation platform makes us the market leader.
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Our expertise covers the whole project life cycle. So whether it’s a bespoke product created as part of an ongoing digital transformation product; undertaking a user research piece into a charities donation journey; or designing, building and hosting a CMS website integrated to your CRM, we have the skills in-house.

Experience Design

Your user is at the heart of everything we do and we have a number of approaches to meet their needs - from UX research and stakeholder managements, through to rapid prototyping as part of an intensive 3 day Design Sprint.

Design and Creative

We are experts at working with your brand to deliver creative and innovative design solutions that fulfil user and organisation needs, often in close collaboration with both your charity and our Experience Design team.

Front and Back-end Development

We have a rich history of developing technically sound solutions, from optimised donation journeys through to complex charity websites. Our team uses agile methodologies and works exclusively in Umbraco. We have also worked with all major payment providers including ApplePay, PayPal, Braintree & Stripe.

Hosting and Support

We believe in long term partnerships with charities to create products and experiences and our in-house team offers different levels of support depending on client requirements. Our cloud based hosting solution offers clients the peace of mind that they need, within a PCI compliant environment.


Addition is part of WPN Chameleon, a ‘Campaign’ top 40 strategic marketing agency. With a long history in creating digital experiences, products and websites, originally as digital agency Chameleon, we are focussed on creating the best solution for charities and their supporters, using our skills and expertise to produce results that affect change.


Get in touch with us to find out more about how we can help, whether it’s user research as part of digital transformation, a Design Sprint focussed on creating a new products, or a brand new website design and build project.