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Johnny Opinion Press

Apps & designs

Things I've built — and things I'm building.

Where opinion meets production. Real software and prototypes built to test theories against market realities. Take a look — and tell me what to build next.

Live

Out in the world and in use.
Piano Enhancer — Turn your phone into a concert hall. Live

Piano Enhancer

2026
Music app

One tap adds studio-grade acoustics, warmth, and natural reverb to home piano recordings — no mic, no account. Dry room in, concert hall out. Live on Google Play; iOS in the works.

AndroidAudio DSPOn-device
ShinySplit — Split money, not love. Live

ShinySplit

2026
Web app

A free group expense tracker for trips and shared dinners — track who paid, split the bill across any currency, and settle up fairly. No app, no signup: just share a link.

Web appMulti-currencyNo-signup

In progress

Working prototypes — rough edges, real ideas.
Prototype

The Eval Index

2026
Instrument

A weekly read on how rigorously we actually measure AI — not how loudly we talk about it.

Data vizEditorial

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