Apps

Create an account to get access to these tools.

gdt.apitest Test REST APIs with saved collections and environments — a self-hosted Postman alternative. gdt.childcare Plan childcare cover for holidays — assign carers, clubs, and activities for each child per day. gdt.teamvault Secure private file storage and sharing — a self-hosted alternative to Google Drive and Dropbox. gdt.timelog Track time across projects with a calendar view — log what you worked on and when. gdt.website Build and publish a simple website with markdown pages and blog posts. gdt.email A self-hosted webmail client — a privacy-first alternative to Gmail and Outlook. invite only gdt.family DNS filtering and VPN management for the family — block sites, manage devices per profile, see live stats from the data plane. invite only gdt.offtherecord A distributed music archive with DJ tooling — organise, analyse, and sync your collection. invite only gdt.vidi Self-hosted media streaming — organise and watch your library from anywhere, no Plex subscription needed. invite only
Developer Tools

No account needed — runs in your browser.

gdt.colour Colour picker, format converter, WCAG contrast checker, and palette generator. gdt.diff Compare two blocks of text side by side with highlighted additions and deletions. gdt.image Resize, rotate, flip, crop, and convert images — all in your browser, nothing uploaded. gdt.json Format, validate, minify, and explore JSON with a collapsible tree viewer. gdt.markdown Markdown editor with live preview, formatting toolbar, and load/save to file. gdt.password A secure password generator that runs entirely in your browser — nothing is sent or stored. gdt.qrcode Generate QR codes instantly — for URLs, WiFi, email, phone numbers, or any text.
Finance Tools

No account needed — runs in your browser.

gdt.mortgage Mortgage early repayment calculator with ERC analysis and remortgage scenario comparison. gdt.salary UK salary sacrifice calculator — model pension, EV, and Cycle to Work savings.
Fun Stuff

No account needed — runs in your browser.

gdt.bingo Bingo number caller with configurable range — game state saved in your browser. gdt.dragon32 Browser-based Dragon 32 emulator — assembles and runs 6809 assembly in real time. gdt.teaboy Randomly pick who makes the tea — add names, hit the button, and let fate decide.
Games

No account needed — runs in your browser.

gdt.arcade A rack of retro C64-style games — Roof Raider inside, more on the way. Load a tape to play. gdt.jaspersadventure A 3D top-down adventure game built with Three.js — procedural graphics, no external assets.
My Projects

Other things I've built.

cetasoft.net The industry-standard post-production management platform I founded — trusted by high-end film and TV producers worldwide. festivalplanner.io A festival planning and management tool to help organisers run events from first idea to final act. sendhelponline.org Helping parents of children with special educational needs navigate the school system with confidence. sophyparty.com Run live quizzes, manage guests, collect photos and take song requests — all from one place. squadcal.io Cut through group chat chaos and find the perfect time for any event with friends. witneysupport.com A local business directory built during the 2020 lockdown to help Witney's high street shops stay connected. Now retired.
Other Interests

Things I'm involved in outside of tech.

Gentleman's Supper Club A monthly supper club I founded in honour of a friend — giving men a chance to get out, enjoy good food and great company. Omerta Silent Discos A small group of local DJs and promoters — we put on silent discos, usually for charity. Witney & West Oxfordshire Foodbank Providing emergency food to people in crisis across West Oxfordshire — I serve as a Trustee. Witney Music Festival A family-friendly two-day open-air music festival — I serve as a Director, helping bring live music to the community.
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