7 of 406 ideas

A solo-built real-time bus/train tracker covering 160+ cities, downloaded 5.2M times, grown to $30K/mo in subscriptions on free App Store keyword optimization (ASO) alone.

Stephen has shipped hit app after hit app, and he's publishing his four-step idea-validation framework. Posted is doing $90K/mo right now; his last one, PuffCount, hit $44K/mo before he sold it. The core of the method: marketing is 90% of the outcome.

An “emergency button” app built for panic attacks and anxiety

An AI fitness app that builds custom smart training plans for gym strength training

Single-feature niche apps that identify and price anything from one photo — one team built a whole portfolio across coins, rocks, antiques, and insects, with the top app doing $500K/mo