Our services


  • ui-ux-design

    UI/UX design

    We provide support across the full UX spectrum, from creating product concepts that hit the intersection of business and user needs, to interface designs that delight and maximize KPIs. Our design process takes full advantage of our deep engineering expertise, ensuring the features and interfaces we design are as efficient as possible to build.

  • web-design

    Web design

    We help our clients to present their businesses, products, and services in the best possible light by designing well-architected and refined websites that are optimized for all sizes and types of device, enabling their customers to access the information that's important to them while building confidence and trust.

  • design-research

    Design research

    We believe it's important to make informed product decisions based on validated learning in order to maximise the business performance of a product. To do this, we conduct user interviews to better understand user needs, goals, and lifestyles, test product concepts for market fit, and carry out user testing to ensure our designs enable users to access product value.


We pride ourselves in our decade-plus history of building products for mobile and the web. We focus on using technologies that enable rapid and cost-effective product development, with strong developer communities that make hiring for a growing team easier.

  • Mobile applications

    • react

      React Native

    • ios


    • android


  • Web applications

    • react


    • vue-js

      Vue JS

  • Web services

    • ruby-on-rails

      Ruby on Rails

    • node-js

      Node JS

  • E-commerce

    • stripe


    • shopify


    • woo-commerce


  • Marketing websites

    • wordpress


    • gatsby


Some companies we've worked with

Unfortunately we can’t show the logos of some of our biggest clients for contractual reasons, but here are some that we can show.

A selection of our work

  • BattleBase

    A powerful, multi-platform, multi-user application and social platform for players of a popular tabletop game.

  • Zaiko

    A year-long collaboration with the fast-growing Tokyo event solutions startup during which Tacchi produced multiple web and mobile products.

  • Rugby School Japan

    Design and development of a refined and informative website for the upcoming Japan branch of the historic boarding school from the UK.

  • mymizu

    Design and development of an iOS and Android app for the social innovation startup, with a focus on native experience, development speed, and long-term cost efficiency.

  • Design Tshirts Store graniph

    We helped one of Japan’s hottest fashion retailers reach a growing mobile customer base.

  • Speed Learning

    Native mobile apps, web dashboards, multimedia content encoding and distribution, ecommerce, speech recognition, desktop and mobile video conferencing… you name it, for Speed Learning we’ve probably built it.

  • HirePlanner

    A bilingual Cloud Recruiting Management System that helps companies hire and build great teams.

  • Nicolai Bergmann

    A new, custom e-commerce solution worthy of Nicolai Bergmann’s fantastic designer brand.

  • Contemporary Art Foundation

    A vibrant visual identity, print and web design, and a powerful entry submission and multi-stage screening web service for one of Japan’s premier art awards.

  • People Make Places

    iOS and web companions to a beautiful book and concierge service of the same name.

  • Summerbird

    A delicious combination of brand site and e-commerce for the luxury Danish confectioner’s Japan market entry.

  • Canvas

    An in-house project to create the definitive community hub for creative individuals and businesses in Tokyo.

Let's talk about working together!

Tell us a little about your business and what you'd like to achieve. We'll be in touch to follow up as soon as we can!