I started a small janky passion project called https://privateequityvet.org which used Leaflet.js to map corporately owned veterinary practices in the US. The site gradually took off, was covered on PBS Newshour and now gets 20k uniques a day.
A few months ago I launched IndependentVet.com which aims to be the opposite of the original site, helping pet parents in the US/Canada/UK identify locally owned veterinary practices. Just yesterday I launched native mobile apps that I developed over the course of three intense weeks of evenings and weekends using Opus 5.5. While it's early days, I'm really happy with how it turned out: https://independentvet.com/get
Would love to hear what you think!