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John Slater.

Side projects

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I further build my skills in design and development by working on my own side projects. Some become products, some become blog posts, and at least one is nailed to my wall.

Nomekop (2025 – Present)

The Nomekop builder in Game Boy green, showing set selection, binder grid options and a card preview

A free web app for planning Pokémon TCG binder layouts, wrapped in an original Game Boy aesthetic. Pick any set, choose your binder grid, tick off your collection and print A4 binder pages, checklists and true-size pocket placeholders. WCAG 2.2 AA is a tested requirement, and the whole thing works keyboard-only.

Read the write-up, try it at nomekop.app or see the code on GitHub.

js-skills (2026 – Present)

Flat illustration of a large document card connected by lines to three smaller interface elements on a pale mint background

My general-purpose Claude Code skills, packaged as a plugin with its own self-hosted marketplace – it installs straight from GitHub and updates with a git push. The skills teach Claude my conventions: UX guidelines for forms and loading states, my tone of voice for writing, and the illustration style for article artwork. The image above was generated from a prompt written by that last one.

Read the write-up or see the code on GitHub.

Payment logo icon pack (2015, now inactive)

Visa, Mastercard and American Express credit card logo icons on a pale background

A free collection of 50 credit card and payment logos in SVG and PNG that I created for my own ecommerce work and shared on GitHub. The pack is still available and over the years other people contributed missing logos, but I’m no longer maintaining it and have no plans to update it.

Download the pack.

The Killers ‘K’ sign (2020)

Finished light-up 'K' sign glowing red on a sideboard beside a small lantern lamp

My own scaled-down version of the light-up K that The Killers haul on stage – jigsaw-cut pine, 68 LEDs and an Arduino Nano. One of my favourite builds and it lives in my house.

Read how I built it.

Casi Countdown (iOS App) (2015 – 2019)

As a small side project I decided to tackle the obsession with countdown apps. These are simple apps that show you how far away a specific date is and send you occasional reminders. The popularity of this type of app and the reminder of simply how ugly the majority of these apps are prompted me to create a better product.

A simple app stripped back to the very core: enter dates for events in your life and get a visual countdown (months, days, minutes, secs) plus notifications at milestones.

Casi Countdown was retired in 2019 and is no longer available to download.

iFestival (iOS App) (2010 – 2016)

Three iFestival app screens showing festival countdown, a user profile and favourite artists list

iFestival was the unofficial app for people attending the popular music festival, V Festival, in the UK.

I created the original version in 2010 when I began learning iOS development in Objective-C. In 2013 I completely rewrote the app and backend API (PHP) to turn the product into a place where festival goers could meet, chat and share photos. Between 2013 and 2016 the app amassed over 26,000 registered users and has been responsible for creating some great friendships amongst users both during and after the festival.

SayWha! Music Quiz Game (iOS App) (2011)

The idea of creating a game always interested me from a young age and as I began to develop my skills in iOS development I saw the opportunity to create a small game. SayWha! was a music quiz app I created around my love for music. Users answered multiple choice music questions – the quicker you answered, the more points you got. Your name and Facebook profile photo appeared on a timeline so you could compete against strangers.

I stopped pursuing the idea after the initial release as I began to focus my efforts on iFestival App.

Beach Club (iOS App) (2015 – 2016)

Three iPhone screens of the Beach Club app: news feed, event tickets list and Magaluf bars map

In 2015 I started working with package holiday and events company Feel Summer to create the most unique experience for people traveling to Magaluf. The Beach Club app allowed holiday-makers to buy tickets to and track what events were taking place while they’re on holiday.

As well as events, Beach Club integrated iBeacon technology so event venues and bars could market directly to customers as they passed the entrance – real-time, location-aware and highly targeted for venues.