8 of 406 ideas

Clone a URL shortener with zero code using Replit and collect pure passive ad revenue from Google AdSense

A remote-controlled countdown timer for speakers and show callers

An HTML-to-PDF API for developers, billed per request

Ramble into your phone, and AI turns the mess into a clean note — a no-code tool built in a 12-hour hackathon that now makes $15K/month

One button that strips filler words, background noise, long silences and mouth clicks out of a podcast — $20K/month from a feature nobody wanted to build a company around

A page that shows a blank white screen pulls 800,000 monthly visits and an estimated $1,500-$2,500 a month, because nobody arriving is trying to buy anything — the RPM lesson every boring-tool builder skips.