Side projects · 2026

Five things I built
because I wanted to use them.

Not demos. Each one is live. Four solve a problem I actually had and are careful about the same thing: saying where their numbers come from, and admitting when they do not know. The fifth is just for fun.

Holy Moly

A group of friends plans a trip together, then splits what it cost.

  • Everything one trip needs settling — who is coming, when, what to do, what is finally agreed and who paid what — as five tabs on a single page, in whatever order the group gets to them.
  • One link is the whole invitation. Whoever opens it types a name and answers; nobody installs anything or makes an account, and the talking stays in the group chat where it already was.
  • It finds the date everyone can actually do, keeps the plan readable on the mountain with no signal, and at the end names the shortest way to square up — who pays whom, in as few transfers as the arithmetic allows.
Live
since 3 Sep 2026
Built with
Next.js 16 · Clerk · Drizzle + Neon · next-intl · web push · Vitest + Playwright
Open Holy Moly
  • The landing page in dark mode: the wordmark over a contour-line background, the promise

    The front door, for somebody who arrives without a link

Commensa

Friends compare how their investing is going — as percentages, never amounts.

  • A private circle shows everyone's progress on one scale, so a first savings plan sits beside a twenty-year portfolio without either being embarrassing.
  • Nobody ever learns what anybody holds, paid, or is worth. That is enforced by what the app stores, not by everyone being polite.
  • Imports a CSV straight from Trade Republic or finanzen.net ZERO, resolves each ISIN to a live price, and fills in dividends on its own.
Live
since 18 Aug 2026
Built with
Next.js 16 · Clerk · Drizzle + Neon · next-intl · Vitest + Playwright
Open Commensa
  • A circle chart in dark mode showing four members' returns as percentage lines over a year, with a feed of buys and sells beneath it.

    An example circle — invented friends, real prices

Fairground

What a company is worth, on assumptions you set yourself.

  • Four valuation models run side by side and are never averaged into one number — where they disagree is the answer worth having.
  • Growth, margins, cost of capital and holding period are all yours to change, and every figure moves as you type.
  • A model that cannot price a company is greyed out with the reason. Nothing is guessed to fill a gap.
Live
since 13 Aug 2026
Built with
Next.js · Drizzle + Neon · SEC EDGAR filings · end-of-day prices

Personal learning project — not investment advice

Open Fairground
  • A stock page for Apple: four valuation models each with its own verdict and reasoning, beside the range of what they say the company is worth.

    Four models, four verdicts, one set of assumptions

Product Role Navigator

The same job title covers very different work. This says which work.

  • Describes what product roles in software actually involve, across eight areas of skill and twelve reference roles.
  • Rate a role you are hiring for, or paste an advert and put your own profile beside it to see exactly where the two diverge.
  • Every number states its source — quoted, reference, derived, or edited by you — and says plainly when something was never stated at all.
Live
since 12 Aug 2026
Built with
One standalone HTML file · no backend · UK GDS capability framework

Seven axes quote GDS; the eighth is authored and marked as such

Open the Navigator
  • The opening screen, offering to rate a role you are hiring for or to analyse a job advert.

    Two ways in: hiring for a role, or sizing one up

And one just for fun

Afterglow

A wall of lights in the browser that you play instead of watch.

  • Two animated patterns blend on a grid of 8 to 256 lights across, in nine palettes and six kinds of hardware: plain LEDs, RGB stadium pixels, flip-dots, a vacuum fluorescent display, bare LED tape and neon flex.
  • It listens and looks. The microphone turns a meter pattern into a 64-band equalizer and sends ripples on every beat, and a camera or any video file becomes a picture made of lights.
  • Autopilot fades from look to look on its own. On a phone it installs to the home screen and runs full screen, where holding a finger on the lights picks something new.
Live
since 11 Sep 2026
Built with
One HTML file · WebGL 2 shaders · Web Audio · no framework, no backend

Sound and video are analysed on the device and never uploaded

Open Afterglow
  • The Afterglow panel in its default look: thousands of small round lights in magenta, orange and gold forming slow flowing shapes, beside a sidebar of autopilot and pattern controls.

    Two patterns blended, with every control beside the panel